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134-506: Newport Wasps were a British motorcycle speedway team based in Newport , South Wales from 1964 to 2012. They were the 1999 Conference League champions. The Wasp logo incorporates the traditional black and amber colours of the City of Newport. Newport Wasps first competed in the 1964 Provincial Speedway League (division 2), they finished a creditable fourth and also won the division 2 version of

268-662: A porous phase that holds gases (the soil atmosphere) and water (the soil solution). Accordingly, soil is a three- state system of solids, liquids, and gases. Soil is a product of several factors: the influence of climate , relief (elevation, orientation, and slope of terrain), organisms, and the soil's parent materials (original minerals) interacting over time. It continually undergoes development by way of numerous physical, chemical and biological processes, which include weathering with associated erosion . Given its complexity and strong internal connectedness , soil ecologists regard soil as an ecosystem . Most soils have

402-623: A dry bulk density (density of soil taking into account voids when dry) between 1.1 and 1.6 g/cm , though the soil particle density is much higher, in the range of 2.6 to 2.7 g/cm . Little of the soil of planet Earth is older than the Pleistocene and none is older than the Cenozoic , although fossilized soils are preserved from as far back as the Archean . Collectively the Earth's body of soil

536-473: A flat oval track usually consisting of dirt , loosely packed shale , or crushed rock (mostly used in Australia and New Zealand). Competitors use this surface to slide their machines sideways, powersliding or broadsiding into the bends. On the straight sections of the track, the motorcycles reach speeds of up to 70 miles per hour (110 km/h). There are now both domestic and international competitions in

670-426: A maximum length of 30 centimetres (12 in)) attached to the rider's right wrist." The high compression ratio of the engine can also assist in slowing down a machine; if the throttle is closed, the engine may stop. Riders can stop the bike by deliberately laying down the bike on the track, and this technique is used to avoid riders who fall in front of pursuing opponents. Before cut-outs were introduced, an engine

804-451: A medium for plant growth , making it a critically important provider of ecosystem services . Since soil has a tremendous range of available niches and habitats , it contains a prominent part of the Earth's genetic diversity . A gram of soil can contain billions of organisms, belonging to thousands of species, mostly microbial and largely still unexplored. Soil has a mean prokaryotic density of roughly 10 organisms per gram, whereas

938-419: A net absorption of oxygen and methane and undergo a net release of carbon dioxide and nitrous oxide . Soils offer plants physical support, air, water, temperature moderation, nutrients, and protection from toxins. Soils provide readily available nutrients to plants and animals by converting dead organic matter into various nutrient forms. Components of a silt loam soil by percent volume A typical soil

1072-788: A number of countries, including the Speedway World Cup , whilst the highest overall scoring individual in the Speedway Grand Prix events is pronounced the world champion. Speedway is popular in Central and Northern Europe and to a lesser extent in Australia and North America. A variant of track racing , speedway is administered internationally by the Fédération Internationale de Motocyclisme (FIM). Domestic speedway events are regulated by FIM-affiliated national motor sport federations . The early history of speedway race meetings

1206-549: A pH of 9, plant growth is reduced. High pH results in low micro-nutrient mobility, but water-soluble chelates of those nutrients can correct the deficit. Sodium can be reduced by the addition of gypsum (calcium sulphate) as calcium adheres to clay more tightly than does sodium causing sodium to be pushed into the soil water solution where it can be washed out by an abundance of water. There are acid-forming cations (e.g. hydronium, aluminium, iron) and there are base-forming cations (e.g. calcium, magnesium, sodium). The fraction of

1340-416: A record time of 59 seconds on a 342 metres (1,122 ft) track and produced an average speed of 83 km/h (51.86 mph). The speed on straight sections of the track reaches 110 km/h (70 mph) or more on longer tracks, but the limited speed on curves lowers the average. At the start of a race it takes between one and two seconds for the motorcycle to reach the "curve speed" (somewhat lower than

1474-731: A result of a trade-off between toxicity and requirement most nutrients are better available to plants at moderate pH, although most minerals are more soluble in acid soils. Soil organisms are hindered by high acidity, and most agricultural crops do best with mineral soils of pH 6.5 and organic soils of pH 5.5. Given that at low pH toxic metals (e.g. cadmium, zinc, lead) are positively charged as cations and organic pollutants are in non-ionic form, thus both made more available to organisms, it has been suggested that plants, animals and microbes commonly living in acid soils are pre-adapted to every kind of pollution, whether of natural or human origin. In high rainfall areas, soils tend to acidify as

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1608-401: A result, layers (horizons) form in the soil profile. The alteration and movement of materials within a soil causes the formation of distinctive soil horizons . However, more recent definitions of soil embrace soils without any organic matter, such as those regoliths that formed on Mars and analogous conditions in planet Earth deserts. An example of the development of a soil would begin with

1742-422: A rider with a scheduled ride may go out for double points, in which the riders points will be doubled if he beats a rider of the opposing team. Any rider taking a tactical substitute ride or double points ride is denoted by a black and white helmet colour as rather than one of the four usual coloured helmets. If that rider remains unbeaten by either opposition rider his scored points are doubled and also count towards

1876-683: A second job, or amateurs. The United Kingdom has three main domestic leagues, the SGB Premiership , the SGB Championship , and the National League , as well as three 'junior' amateur leagues. It also has a youth championship. Speedway is one of the most popular sports in Poland and is governed by the Main Commission for Speedway Sport (Główna Komisja Sportu Żużlowego, GKSŻ) which is a part of

2010-426: A series of meetings over the space of a week in the summer. The final World Cup Champions were Poland in 2017. The Speedway World Pairs Championship was an annual speedway event held each year in different countries. Competing countries picked their top two riders to represent them (or in some cases, those who were available). The first competition was held in 1970 and the final competition was held in 1993. From 1994

2144-590: A smaller scale, competitions are also held in Argentina, Australia, Austria, Belgium, Bulgaria, Canada, Croatia, Czechia, Finland, France, Germany, Hungary, Italy, Latvia, the Netherlands, New Zealand, Norway, Romania, Russia, Slovakia, Slovenia, South Africa, Ukraine and the United States. Some countries' top divisions feature highly paid star riders. In smaller countries and lower divisions, riders may be part-timers with

2278-412: A soil can be said to be developed, and can be described further in terms of color, porosity, consistency, reaction ( acidity ), etc. Water is a critical agent in soil development due to its involvement in the dissolution, precipitation, erosion, transport, and deposition of the materials of which a soil is composed. The mixture of water and dissolved or suspended materials that occupy the soil pore space

2412-399: A soil determines its ability to supply available plant nutrients and affects its physical properties and the health of its living population. In addition, a soil's chemistry also determines its corrosivity , stability, and ability to absorb pollutants and to filter water. It is the surface chemistry of mineral and organic colloids that determines soil's chemical properties. A colloid

2546-472: A valence of two, converts to (40 ÷ 2) × 1 milliequivalent = 20 milliequivalents of hydrogen ion per 100 grams of dry soil or 20 meq/100 g. The modern measure of CEC is expressed as centimoles of positive charge per kilogram (cmol/kg) of oven-dry soil. Most of the soil's CEC occurs on clay and humus colloids, and the lack of those in hot, humid, wet climates (such as tropical rainforests ), due to leaching and decomposition, respectively, explains

2680-553: Is 0.04%, but in the soil pore space it may range from 10 to 100 times that level, thus potentially contributing to the inhibition of root respiration. Calcareous soils regulate CO 2 concentration by carbonate buffering , contrary to acid soils in which all CO 2 respired accumulates in the soil pore system. At extreme levels, CO 2 is toxic. This suggests a possible negative feedback control of soil CO 2 concentration through its inhibitory effects on root and microbial respiration (also called soil respiration ). In addition,

2814-603: Is a measure of the acidity or alkalinity of the soil. More precisely, it is a measure of hydronium concentration in an aqueous solution and ranges in values from 0 to 14 (acidic to basic) but practically speaking for soils, pH ranges from 3.5 to 9.5, as pH values beyond those extremes are toxic to life forms. At 25 °C an aqueous solution that has a pH of 3.5 has 10 moles H 3 O (hydronium ions) per litre of solution (and also 10 moles per litre OH ). A pH of 7, defined as neutral, has 10 moles of hydronium ions per litre of solution and also 10 moles of OH per litre; since

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2948-509: Is a small, insoluble particle ranging in size from 1 nanometer to 1 micrometer , thus small enough to remain suspended by Brownian motion in a fluid medium without settling. Most soils contain organic colloidal particles called humus as well as the inorganic colloidal particles of clays . The very high specific surface area of colloids and their net electrical charges give soil its ability to hold and release ions . Negatively charged sites on colloids attract and release cations in what

3082-470: Is a subject of much debate and controversy. There is evidence to show that meetings were held on small dirt tracks in Australia and the United States before World War I . On 13 November 1905 motorcycle racing was held at the Newcastle NSW Rugby Ground, a distance of approximately 440 yards. American rider Don Johns was known to have used broadsiding before 1914. It was said that he would ride

3216-411: Is about 50% solids (45% mineral and 5% organic matter), and 50% voids (or pores) of which half is occupied by water and half by gas. The percent soil mineral and organic content can be treated as a constant (in the short term), while the percent soil water and gas content is considered highly variable whereby a rise in one is simultaneously balanced by a reduction in the other. The pore space allows for

3350-424: Is also a net sink of methane (CH 4 ) but a net producer of methane (a strong heat-absorbing greenhouse gas ) when soils are depleted of oxygen and subject to elevated temperatures. Soil atmosphere is also the seat of emissions of volatiles other than carbon and nitrogen oxides from various soil organisms, e.g. roots, bacteria, fungi, animals. These volatiles are used as chemical cues, making soil atmosphere

3484-556: Is an important characteristic of soil. This ventilation can be accomplished via networks of interconnected soil pores , which also absorb and hold rainwater making it readily available for uptake by plants. Since plants require a nearly continuous supply of water, but most regions receive sporadic rainfall, the water-holding capacity of soils is vital for plant survival. Soils can effectively remove impurities, kill disease agents, and degrade contaminants , this latter property being called natural attenuation . Typically, soils maintain

3618-493: Is argued that they are easier to handle. As speedway bikes do not use brakes , the clutch is used as a release mechanism at the start of races. FIM regulations state that the motorcycles must have no brakes , are fueled by pure methanol , use only one gear and weigh a minimum of 77 kilograms (170 lb). By using engine and rear wheel sprockets the gear ratio can be adjusted as required for track conditions. The use of methanol allows for an increased compression ratio to

3752-464: Is assumed acid-forming cations). Base saturation is almost in direct proportion to pH (it increases with increasing pH). It is of use in calculating the amount of lime needed to neutralise an acid soil (lime requirement). The amount of lime needed to neutralize a soil must take account of the amount of acid forming ions on the colloids (exchangeable acidity), not just those in the soil water solution (free acidity). The addition of enough lime to neutralize

3886-414: Is called the pedosphere . The pedosphere interfaces with the lithosphere , the hydrosphere , the atmosphere , and the biosphere . Soil has four important functions : All of these functions, in their turn, modify the soil and its properties. Soil science has two basic branches of study: edaphology and pedology . Edaphology studies the influence of soils on living things. Pedology focuses on

4020-401: Is called the soil solution. Since soil water is never pure water, but contains hundreds of dissolved organic and mineral substances, it may be more accurately called the soil solution. Water is central to the dissolution , precipitation and leaching of minerals from the soil profile . Finally, water affects the type of vegetation that grows in a soil, which in turn affects the development of

4154-421: Is dependent on the type of parent material , the processes that modify those parent materials, and the soil-forming factors that influence those processes. The biological influences on soil properties are strongest near the surface, though the geochemical influences on soil properties increase with depth. Mature soil profiles typically include three basic master horizons: A, B, and C. The solum normally includes

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4288-399: Is divided into a grid of four equal parts and the riders from each team must take their place in alternate grids or "gates". The colours also denote starting positions in individual events; Red is the inside gate (gate 1), blue starts from gate 2, white starts from gate 3 and yellow/black starts on the outside (gate 4). When an event dictates that there is a fifth rider at the start line, gate 3

4422-504: Is halfway along one of the two straight sections of the track. Starting gates are simple spring-loaded mechanisms that raise two or three strands of tape to start the race. The FIM regulations require licensed tracks to provide a garage or pit area for motorcycles as well as medical and press facilities. Track boundaries are marked by white lines or barriers on the inside and outside the track, any rider who crosses this boundary with both wheels will be disqualified unless they only did so in

4556-401: Is induced. Capillary action is responsible for moving groundwater from wet regions of the soil to dry areas. Subirrigation designs (e.g., wicking beds , sub-irrigated planters ) rely on capillarity to supply water to plant roots. Capillary action can result in an evaporative concentration of salts, causing land degradation through salination . Soil moisture measurement —measuring

4690-502: Is known as a tape infringement and can result in a false start being recorded and the rider penalised (disqualified, or in league matches in Great Britain, a 15-metre penalty or replace the disqualified rider with a team reserve). The race is started with the raising of the start tape mechanism operated by the match referee and the riders must proceed around the track in an anti-clockwise direction without both wheels illegally leaving

4824-531: Is likely home to 59 ± 15% of the species on Earth. Enchytraeidae (worms) have the greatest percentage of species in soil (98.6%), followed by fungi (90%), plants (85.5%), and termites ( Isoptera ) (84.2%). Many other groups of animals have substantial fractions of species living in soil, e.g. about 30% of insects , and close to 50% of arachnids . While most vertebrates live above ground (ignoring aquatic species), many species are fossorial , that is, they live in soil, such as most blind snakes . The chemistry of

4958-472: Is measured at a distance of 1 metre (3.3 ft) from the inner boundary. Tracks may be banked, but the gradient must under no circumstances exceed 5% in the straight, 10% in the bends, and must remain constant and grow from the inner edge to the safety fence. A white start line is marked across the track approximately mid-way along one of the straights. The starting area is also divided into four equal parts (known as gates) by white lines marked at right angles to

5092-477: Is more advanced. Most plant nutrients, with the exception of nitrogen , originate from the minerals that make up the soil parent material. Some nitrogen originates from rain as dilute nitric acid and ammonia , but most of the nitrogen is available in soils as a result of nitrogen fixation by bacteria . Once in the soil-plant system, most nutrients are recycled through living organisms, plant and microbial residues (soil organic matter), mineral-bound forms, and

5226-428: Is moved to the centre with a green helmet colour, and white and yellow (or yellow/black) take gates 4 and 5 respectively. Riders must be able to get their bikes to the start line under their own power, without any external assistance and not by pushing the machine, then line up in parallel. A rider who is not at the start line within a reasonable period of time is also liable to be disqualified, although league matches in

5360-409: Is referred to as cation exchange . Cation-exchange capacity is the amount of exchangeable cations per unit weight of dry soil and is expressed in terms of milliequivalents of positively charged ions per 100 grams of soil (or centimoles of positive charge per kilogram of soil; cmol c /kg ). Similarly, positively charged sites on colloids can attract and release anions in the soil, giving

5494-427: Is scheduled to ride four or five times. The team with the most points at the end of the meeting is the winner. Most league seasons end with play-offs – a series of meetings between the highest finishing teams to determine a league champion. The champions may be promoted to a higher division and the team finishing at the bottom are in some countries relegated to a lower division. The majority of countries supplement

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5628-948: Is the current (2019) World Champion. The annual British Grand Prix is currently held at the Millennium Stadium in Cardiff , Wales. Scoring in Grand Prix events changed in 2005 with riders scoring 3–2–1–0 in their races and these points being carried forward to decide the winner of each Grand Prix. At the end of the series the highest scorer becomes the world champion. World Speedway Champions include Ivan Mauger (six-time World Champion), fellow New Zealander Barry Briggs (four times), Ole Olsen (three times), Ove Fundin (five times), Lionel Van Praag (inaugural World Champion in 1936), Hans Nielsen (nicknamed "The Professor", four-time World Champion), Tony Rickardsson (six times), Erik Gundersen and Jason Crump , both three-time World Champions, and

5762-540: Is very little organic material. Basaltic minerals commonly weather relatively quickly, according to the Goldich dissolution series . The plants are supported by the porous rock as it is filled with nutrient-bearing water that carries minerals dissolved from the rocks. Crevasses and pockets, local topography of the rocks, would hold fine materials and harbour plant roots. The developing plant roots are associated with mineral-weathering mycorrhizal fungi that assist in breaking up

5896-695: The 1975 British League season . The promotion and riders moved to Bristol in 1977 as the Bristol Bulldogs but speedway continued at Somerton Park for one more season after dropping down to the National League in 1977, at which point they rode as the Newport Dragons for one season. The modern incarnation of the team was founded in 1997, when the Wasps entered the Premier League and the junior side called

6030-595: The Knockout Cup , when winning the Provincial League Knockout Cup during their debut season. The following season they joined the inaugural British League season (the top division). Wally Mawdsley and Pete Lansdale took over the Wasps in 1969, following Mike Parker relinquishing his interest. Newport would remain in the top division until 1977. The team was based at the Somerton Park stadium, which

6164-922: The Polish Motor Union Polski Związek Motorowy (PZM). The PZM is a member of the FIM and the Union Européenne de Motocyclisme (UEM). The Polish Extraleague has the highest average attendances for any sport in Poland. The first speedway meetings in Poland were held in the 1930s and league racing began in 1948. There are three championships in Poland: individual (IMP), pairs (MPPK) and team (the DMP consisting of three leagues). The Junior under-21 championships also has three competitions: individual (MIMP), pairs (MMPPK) and team (MDMP). There are three leagues: Extraleague , First League and Second League . In

6298-716: The Under-21 Individual World Championship . In total, seven Polish riders have been World Champions at Under-21 level. Speedway in Sweden is governed by the Swedish Motorcycle and Snowmobile Federation (SVEMO) . The first Swedish speedway league was founded in 1948 and copied the British format of league racing, including adopting the Swedish version of several British teams nicknames. The Elite League ( Elitserien )

6432-490: The aeration of the soil and the ability of water to infiltrate and to be held within the soil. Soil water content can be measured as volume or weight . Soil moisture levels, in order of decreasing water content, are saturation, field capacity , wilting point , air dry, and oven dry. Field capacity describes a drained wet soil at the point water content reaches equilibrium with gravity. Irrigating soil above field capacity risks percolation losses. Wilting point describes

6566-561: The humus form ), the copedon (in intermediary position, where most weathering of minerals takes place) and the lithopedon (in contact with the subsoil). The soil texture is determined by the relative proportions of the individual particles of sand , silt , and clay that make up the soil. The interaction of the individual mineral particles with organic matter, water, gases via biotic and abiotic processes causes those particles to flocculate (stick together) to form aggregates or peds . Where these aggregates can be identified,

6700-425: The mineralogy of those particles can strongly modify those properties. The mineralogy of the finest soil particles, clay, is especially important. Large numbers of microbes , animals , plants and fungi are living in soil. However, biodiversity in soil is much harder to study as most of this life is invisible, hence estimates about soil biodiversity have been unsatisfactory. A recent study suggested that soil

6834-670: The 1928–1929 season at the Melbourne Exhibition Speedway , Australian Colin Stewart won the prestigious Silver Gauntlet, which required the rider to win the feature race 10 times in one season. He won it 12 times. He also achieved success at an international level, racing for Southampton Saints in 1929 and captained Glasgow in the Northern League in 1930 before moving to Wembley Lions in 1931, for whom he rode in just four matches, averaging 4.00 points per match. He also raced in

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6968-648: The 1930 Scottish Championship which was won by Wembley Lions' Harry Whitfield . The forerunner of the World Championship, the Star Riders' Championship , was inaugurated in Great Britain in 1929, but was split into two sections, as it was felt that the British riders were not yet the equal of the Australians and Americans. Frank Arthur won the Overseas Section and Roger Frogley the British. The following year

7102-490: The 1930s, with the official World Championship first held in 1936 . The present FIM Speedway Grand Prix (SGP) championship organised by Speedway Grand Prix (Discovery Sports Events since 2015) has taken place since 1995. The SGP uses a scoring system based on each riders overall final position. The rider who has gained the most points at the end of the tournament is declared the World Champion . Polish rider Bartosz Zmarzlik

7236-694: The 2022 season, the Extraleague and First League had eight teams competing and the Second League had seven teams. The GKSŻ organizes the Golden Helmet (Jerzy Szczakiel Memorial), Silver Helmet (Under-21) and Bronze Helmet (Under-19) competitions. Individual meetings such as the Criterium of Polish Speedway League Aces – Mieczysław Połukard Memorial , Alfred Smoczyk Memorial , Edward Jancarz Memorial, Jerzy Szczakiel Memorial and Individual international championship of

7370-448: The A and B horizons. The living component of the soil is largely confined to the solum, and is generally more prominent in the A horizon. It has been suggested that the pedon , a column of soil extending vertically from the surface to the underlying parent material and large enough to show the characteristics of all its horizons, could be subdivided in the humipedon (the living part, where most soil organisms are dwelling, corresponding to

7504-564: The Allsvenskan, the top four teams at the end of each season ride in the play-offs in semi-finals and a final. The Allsvenskan Division One is the third tier of Swedish speedway with seven teams. The team finishing the season in first place are champions and can apply for promotion to the Allsvenskan, subject to having suitable facilities and sufficient finances. Other competitions include the Swedish Individual Championship and

7638-610: The Ekstraliga named after Zenon Plech are also popular. The Polish National team are the final champions of the now-defunct Speedway World Cup , having won the competition eight times in all. Poland has produced three Individual World Champions , Jerzy Szczakiel in 1973, Tomasz Gollob in 2010 and Bartosz Zmarzlik in 2019, 2020, 2022, 2023 and 2024. The Polish junior team won the Under-21 World Championship in 2005 and 2006 and since 2003 four Polish juniors have won

7772-489: The FIM occasionally sanctions the use of stadiums that install temporary tracks such as the British Grand Prix held at the Millennium Stadium in Cardiff . Speedway uses a unique type of motorcycle, governed by the FIM's "Track Racing Technical Rules". In the past, bikes with upright engines were used (the name taken from the way the engine sits in the frame), but today most professional riders use laydown bikes as it

7906-571: The Mallett family and rebranded for the 2009 season (including a junior side called the Newport Hornets ) with Steve Mallett at the helm and his son Nick Mallett joining him as the youngest promoter in British speedway history. The 2009 season saw the Hornets win the national league pairs with the pairing of veteran Tony Atkin and New Zealander Grant Tregoning . The following season Newport beat Somerset for

8040-549: The Secretary of Newcastle Speedway Ltd. The Newcastle Herald reports the Grand Opening on 14 November 1925 attracted an audience of 42,000 at that time it was approximately one-third of Newcastle's entire population. After Maitland, Newcastle Showground is the second oldest Motorcycle Speedway track in the world. However, its first recorded motorcycle race was much earlier in 1908. The first Australian Motorcycle Speedway Championship

8174-557: The Severn Bridge trophy and the Hornets finished third in the National league, losing out on the title by points difference. The Wasps last season ended with a trophy, they won the 2011 Premier League Knock-Out Cup defeating Glasgow in the final. After a disagreement with the BSPA and ring wood raceway deciding not to follow up plans to run stock cars and destroying the previous fence the club

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8308-653: The Swedish Junior Individual Championship. The Swedish Individual Championship is contested by 18 riders in a Grand Prix format with 20 heats. The Junior Individual Championship is for riders aged twenty-one years and under. Speedway in Denmark is administered by Danmarks Motor Union (DMU) . The sport was introduced into Denmark in the 1930s but it didn't boom until the 1970s. Notable Danish speedway riders today include – Nicki Pedersen, Bjarne Pedersen and Hans Nørgaard Andersen. Former rider, Ole Olsen won

8442-521: The UK allow teams to elect to start the disqualified rider fifteen metres back from the tapes or replace the disqualified rider with a team reserve. This period of time is standardised to two minutes from a time determined by the match referee and usually indicated by a bell, a rotating orange lamp or a digital clock readout. All riders must be at the tapes under their own power before the two minutes have elapsed. Additional time between races will be allowed by, and at

8576-780: The Western Warriors (a combined team from Newport and Exeter competed in the Conference League . The teams were based at the purpose built Hayley Stadium . The following season (1998) a junior side known as the Newport Mavericks joined the Conference League and then won the 1999 Speedway Conference League . The Wasps continued to compete in the Premier League until the early part of the 2008 season when they withdrew because their promoter Tim Stone died only to be saved by

8710-440: The World Championship three times and his success helped popularise the sport in Denmark. Since retiring Olsen has become an FIM Speedway Grand Prix race director. A popular Danish rider in the 1960s was Arne Pander, and in the 1980s Erik Gundersen, Jan O Pedersen and Hans Nielsen (who was also an active racer through the 1990s). Soil Soil consists of a solid phase of minerals and organic matter (the soil matrix), as well as

8844-631: The World Pairs was merged with the World Team Cup. As of 2018, a new pairs championship, the Speedway of Nations , has now replaced the Speedway World Cup on the sport's calendar. Most European countries run their own domestic speedway leagues. The FIM affiliated governing bodies in each country operate league systems , normally comprising several divisions , in which the teams gain points throughout

8978-406: The acronym CROPT. The physical properties of soils, in order of decreasing importance for ecosystem services such as crop production , are texture , structure , bulk density , porosity , consistency, temperature , colour and resistivity . Soil texture is determined by the relative proportion of the three kinds of soil mineral particles, called soil separates: sand , silt , and clay . At

9112-446: The addition of any more hydronium ions or aluminum hydroxyl cations drives the pH even lower (more acidic) as the soil has been left with no buffering capacity. In areas of extreme rainfall and high temperatures, the clay and humus may be washed out, further reducing the buffering capacity of the soil. In low rainfall areas, unleached calcium pushes pH to 8.5 and with the addition of exchangeable sodium, soils may reach pH 10. Beyond

9246-452: The apparent sterility of tropical soils. Live plant roots also have some CEC, linked to their specific surface area. Anion exchange capacity is the soil's ability to remove anions (such as nitrate , phosphate ) from the soil water solution and sequester those for later exchange as the plant roots release carbonate anions to the soil water solution. Those colloids which have low CEC tend to have some AEC. Amorphous and sesquioxide clays have

9380-437: The atmosphere due to increased biological activity at higher temperatures, a positive feedback (amplification). This prediction has, however, been questioned on consideration of more recent knowledge on soil carbon turnover. Soil acts as an engineering medium, a habitat for soil organisms , a recycling system for nutrients and organic wastes , a regulator of water quality , a modifier of atmospheric composition , and

9514-405: The average), which is roughly estimated to be the equivalent of 2.5 to 3 seconds to reach 100 kilometres per hour (62 mph) (or 0 to 60 mph ). The start of the race is an important aspect of the race overall. "Gating" correctly can help a rider gain an initial advantage over other riders but speed advantages can be made as a race progresses. Those riders willing to take a risk and opt for finding

9648-426: The basic cations are forced off the soil colloids by the mass action of hydronium ions from usual or unusual rain acidity against those attached to the colloids. High rainfall rates can then wash the nutrients out, leaving the soil inhabited only by those organisms which are particularly efficient to uptake nutrients in very acid conditions, like in tropical rainforests . Once the colloids are saturated with H 3 O ,

9782-414: The city once again. 2009 Team 2008 Team 2007 Team 2006 Team Motorcycle speedway Motorcycle speedway , usually referred to simply as speedway , is a motorcycle sport involving four and sometimes up to six riders competing over four anti-clockwise laps of an oval circuit. The motorcycles are specialist machines that use only one gear and have no brakes . Racing takes place on

9916-402: The discretion of, the referee if a rider has two consecutive rides, to allow the rider time to prepare. A starting gate consisting of two or more tapes is erected across the start line. The riders must situate themselves not more than 10 centimetres (3.9 in) from this and not touch it once the green light comes on, they must also remain stationary until the tapes are raised. Failure to do so

10050-436: The dry limit for growing plants. During growing season, soil moisture is unaffected by functional groups or specie richness. Available water capacity is the amount of water held in a soil profile available to plants. As water content drops, plants have to work against increasing forces of adhesion and sorptivity to withdraw water. Irrigation scheduling avoids moisture stress by replenishing depleted water before stress

10184-424: The engine producing more power than other fuels and resulting in higher speeds (approximately 130 kilometres per hour (81 mph) when cornering). Machines used must: Machines used cannot: In addition, all motorcycles must have a safety cut-out device fitted; this is defined as a switch that "must cut off the circuit of the electrical supply by the simple action of pulling a lanyard or a non-elastic string (with

10318-405: The entire race course wide open, throwing great showers of dirt into the air at each turn. By the early 1920s, Johns' style of cornering was followed in the United States, where it was called Short Track Racing, by riders such as Albert "Shrimp" Burns, Maldwyn "Floppy" Jones and Eddie Brinck. Motorcycle Speedway can be traced back to the early 1920s. One track that staged speedway, amongst others,

10452-667: The event of a tie, the race is commonly awarded as a dead heat . If it is a tie for first place, they will both receive two points. A tie for second place earns each rider one point while a joint-last finish earns each rider zero points. Teams can use a tactical substitute rule once in a meeting. If that team is eight (six in World Cup) or more points in arrears, they may bring in the use of a different rider in their team lineup, to race in any heat except for heat 15. This may be different in World cup or event racing. If they are ten or more points behind,

10586-422: The extra riders safely. Speedway operates a sliding scale for scoring (known as the 3–2–1–0 method). Three points are scored for first place, two points for second place and one point for third place. A rider does not score when finishing fourth, or failing to finish, or if excluded from a race. These points accumulate over the competition, with riders points either counting towards individual or team placings. In

10720-460: The first of the next month. These CMA's are used in most professional leagues and are altered or weighted depending on the league the rider gained the CMA in. A rider that has no recorded average will receive an indicative CMA for the start of the season that is assessed on their prior experience in the sport. An international individual speedway championship has taken various forms since its beginnings in

10854-519: The formation, description (morphology), and classification of soils in their natural environment. In engineering terms, soil is included in the broader concept of regolith , which also includes other loose material that lies above the bedrock, as can be found on the Moon and other celestial objects . Soil is a major component of the Earth 's ecosystem . The world's ecosystems are impacted in far-reaching ways by

10988-617: The grippy parts of the track rather than the race line, are sometimes rewarded with extra speed allowing them to pass other riders either on the outside or the inside. Tracks used for professional speedway racing are regulated by the Fédération Internationale de Motocyclisme (FIM) who provide rules concerning construction, size and safety requirements. Speedway racing takes place on a level oval track consisting of two straights joined by two semicircles. Tracks must be between 260 and 425 metres (853 and 1394 ft) in length, this

11122-419: The highest AEC, followed by the iron oxides. Levels of AEC are much lower than for CEC, because of the generally higher rate of positively (versus negatively) charged surfaces on soil colloids, to the exception of variable-charge soils. Phosphates tend to be held at anion exchange sites. Iron and aluminum hydroxide clays are able to exchange their hydroxide anions (OH ) for other anions. The order reflecting

11256-632: The infiltration and movement of air and water, both of which are critical for life existing in soil. Compaction , a common problem with soils, reduces this space, preventing air and water from reaching plant roots and soil organisms. Given sufficient time, an undifferentiated soil will evolve a soil profile that consists of two or more layers, referred to as soil horizons. These differ in one or more properties such as in their texture , structure , density , porosity, consistency, temperature, color, and reactivity . The horizons differ greatly in thickness and generally lack sharp boundaries; their development

11390-407: The interest of safety or were forced to by another competitor. The track surface consists of four layers of grading . The topmost of which must be of shale , granite , brick granules or other loose material of which no individual piece can be over 7 millimetres (0.28 in) in size. Competitors use this surface to slide their machines sideways (powersliding or broadsiding ) into the bends using

11524-549: The league system with one or more cup competitions. These are organised on a knock-out basis, the winner of each match proceeding to the next round and the loser taking no further part in the competition. The major speedway nations in Europe are the United Kingdom, Sweden, Poland and Denmark. These countries run a number of leagues and have regular fixtures throughout the traditional speedway season that runs from March to October. On

11658-429: The negatively charged colloids resist being washed downward by water and are out of reach of plant roots, thereby preserving the soil fertility in areas of moderate rainfall and low temperatures. There is a hierarchy in the process of cation exchange on colloids, as cations differ in the strength of adsorption by the colloid and hence their ability to replace one another ( ion exchange ). If present in equal amounts in

11792-412: The negatively-charged soil colloid exchange sites (CEC) that are occupied by base-forming cations is called base saturation . If a soil has a CEC of 20 meq and 5 meq are aluminium and hydronium cations (acid-forming), the remainder of positions on the colloids ( 20 − 5 = 15 meq ) are assumed occupied by base-forming cations, so that the base saturation is 15 ÷ 20 × 100% = 75% (the compliment 25%

11926-419: The next larger scale, soil structures called peds or more commonly soil aggregates are created from the soil separates when iron oxides , carbonates , clay, silica and humus , coat particles and cause them to adhere into larger, relatively stable secondary structures. Soil bulk density , when determined at standardized moisture conditions, is an estimate of soil compaction . Soil porosity consists of

12060-540: The now-closed 520 metres (570 yd) Claremont Speedway in Perth and the 509 metres (557 yd) Sydney Showground , to smaller, purpose-built 300 metres (330 yd) long motorcycle tracks, such as Gillman Speedway in Adelaide and Mildura 's Olympic Park . Each track is between 260 and 425 metres long and it takes approximately one minute to complete four laps. For example, 10 time Australian Champion Leigh Adams set

12194-472: The ocean has no more than 10 prokaryotic organisms per milliliter (gram) of seawater. Organic carbon held in soil is eventually returned to the atmosphere through the process of respiration carried out by heterotrophic organisms, but a substantial part is retained in the soil in the form of soil organic matter; tillage usually increases the rate of soil respiration , leading to the depletion of soil organic matter. Since plant roots need oxygen, aeration

12328-635: The other cations more weakly bound to colloids are pushed into solution as hydrogen ions occupy exchange sites ( protonation ). A low pH may cause the hydrogen of hydroxyl groups to be pulled into solution, leaving charged sites on the colloid available to be occupied by other cations. This ionisation of hydroxy groups on the surface of soil colloids creates what is described as pH-dependent surface charges. Unlike permanent charges developed by isomorphous substitution , pH-dependent charges are variable and increase with increasing pH. Freed cations can be made available to plants but are also prone to be leached from

12462-420: The passenger ship Oronsay to introduce Speedway Solo motorcycle racing to England. The first meeting in the United Kingdom took place at High Beech on 19 February 1928. There are, however, claims that meetings were held in 1927 at Camberley , Surrey and Droylsden , Lancashire. Despite being described as "the first British Dirt Track meeting" at the time, the meeting at Camberley on 7 May 1927 differed in that

12596-492: The plant roots release hydrogen ions to the solution. CEC is the amount of exchangeable hydrogen cation (H ) that will combine with 100 grams dry weight of soil and whose measure is one milliequivalents per 100 grams of soil (1 meq/100 g). Hydrogen ions have a single charge and one-thousandth of a gram of hydrogen ions per 100 grams dry soil gives a measure of one milliequivalent of hydrogen ion. Calcium, with an atomic weight 40 times that of hydrogen and with

12730-486: The porous lava, and by these means organic matter and a finer mineral soil accumulate with time. Such initial stages of soil development have been described on volcanoes, inselbergs, and glacial moraines. How soil formation proceeds is influenced by at least five classic factors that are intertwined in the evolution of a soil: parent material, climate, topography (relief), organisms, and time. When reordered to climate, relief, organisms, parent material, and time, they form

12864-414: The processes carried out in the soil, with effects ranging from ozone depletion and global warming to rainforest destruction and water pollution . With respect to Earth's carbon cycle , soil acts as an important carbon reservoir , and it is potentially one of the most reactive to human disturbance and climate change . As the planet warms, it has been predicted that soils will add carbon dioxide to

12998-418: The purposes of choosing which riders to enter for each race. At the start of a season, a rider retains their last recorded CMA (or assessed CMA if they have never previously established one) until they have competed in six home and six away matches. A new CMA is then issued that comes into effect seven days later. These are subsequently updated on the 15th of every month from May onwards, and come into effect on

13132-534: The races were held in a clockwise direction. Races at Droylsden were held in an anti-clockwise direction, but it is generally accepted that the sport arrived in the United Kingdom when Australians Billy Galloway and Keith McKay arrived with the intention of introducing speedway to the Northern Hemisphere . Both featured in the 1928 High Beech meeting. The first speedway meeting in the UK to feature bikes with no brakes and broadsiding round corners on loose dirt

13266-414: The rate of diffusion of gases into and out of soil. Platy soil structure and soil compaction (low porosity) impede gas flow, and a deficiency of oxygen may encourage anaerobic bacteria to reduce (strip oxygen) from nitrate NO 3 to the gases N 2 , N 2 O, and NO, which are then lost to the atmosphere, thereby depleting the soil of nitrogen, a detrimental process called denitrification . Aerated soil

13400-481: The rear wheel to scrub-off speed while still providing the drive to power the bike forward and around the bend. The skill of speedway lies in the overall ability of the rider to control his motorcycle when cornering and thus avoid losing places through deceleration . The use of asphalt , concrete and tarmac for any layer is prohibited. The top layer must be levelled or "graded" at intervals during an event by tractors towing specially adapted rakes to evenly re-distribute

13534-571: The rest of the fence through blow-off valves or restriction ports connected to the other sections. They are mandatory for tracks in the British Elite League , Polish Ekstraliga , Speedway Grand Prix and Speedway World Cup . Neutral zones outside the track provide safe run-off areas for riders and their machinery to minimise the potential risk of injury to spectators. The majority of tracks are dedicated to speedway or other sports such as sidecar speedway and banger racing . For larger events,

13668-461: The rider's calculated match average (CMA). The sport produces Calculated Match Averages (CMAs or averages) for every rider, these are calculated from the following: CMAs scale from 3.00 to 12.00, any rider scoring above or below this range of values will be awarded the maximum or minimum respectively. These averages are used in leagues such as the Premiership in the UK to identify heat-leaders for

13802-447: The season depending on results. Teams are placed into tables , placing them in order according to points accrued. Most commonly, each team races every other team in its league at home and away in each season, in a round-robin tournament . Meetings traditionally consist of two teams riding against each other with four riders in each race with two home team riders and two away team riders. Meetings usually feature fifteen heats and each rider

13936-442: The seat of interaction networks playing a decisive role in the stability, dynamics and evolution of soil ecosystems. Biogenic soil volatile organic compounds are exchanged with the aboveground atmosphere, in which they are just 1–2 orders of magnitude lower than those from aboveground vegetation. Humans can get some idea of the soil atmosphere through the well-known 'after-the-rain' scent, when infiltering rainwater flushes out

14070-441: The soil anion exchange capacity. The cation exchange, that takes place between colloids and soil water, buffers (moderates) soil pH, alters soil structure, and purifies percolating water by adsorbing cations of all types, both useful and harmful. The negative or positive charges on colloid particles make them able to hold cations or anions, respectively, to their surfaces. The charges result from four sources. Cations held to

14204-538: The soil by volatilisation (loss to the atmosphere as gases) or leaching. Soil is said to be formed when organic matter has accumulated and colloids are washed downward, leaving deposits of clay, humus , iron oxide , carbonate , and gypsum , producing a distinct layer called the B horizon. This is a somewhat arbitrary definition as mixtures of sand, silt, clay and humus will support biological and agricultural activity before that time. These constituents are moved from one level to another by water and animal activity. As

14338-420: The soil solution composition (attenuate changes in the soil solution) as soils wet up or dry out, as plants take up nutrients, as salts are leached, or as acids or alkalis are added. Plant nutrient availability is affected by soil pH , which is a measure of the hydrogen ion activity in the soil solution. Soil pH is a function of many soil forming factors, and is generally lower (more acidic) where weathering

14472-402: The soil solution. Both living soil organisms (microbes, animals and plant roots) and soil organic matter are of critical importance to this recycling, and thereby to soil formation and soil fertility . Microbial soil enzymes may release nutrients from minerals or organic matter for use by plants and other microorganisms, sequester (incorporate) them into living cells, or cause their loss from

14606-473: The soil voids are saturated with water vapour, at least until the point of maximal hygroscopicity , beyond which a vapour-pressure deficit occurs in the soil pore space. Adequate porosity is necessary, not just to allow the penetration of water, but also to allow gases to diffuse in and out. Movement of gases is by diffusion from high concentrations to lower, the diffusion coefficient decreasing with soil compaction . Oxygen from above atmosphere diffuses in

14740-430: The soil water solution will be insufficient to change the pH, as the acid forming cations stored on the soil colloids will tend to restore the original pH condition as they are pushed off those colloids by the calcium of the added lime. The resistance of soil to change in pH, as a result of the addition of acid or basic material, is a measure of the buffering capacity of a soil and (for a particular soil type) increases as

14874-433: The soil water solution: Al replaces H replaces Ca replaces Mg replaces K same as NH 4 replaces Na If one cation is added in large amounts, it may replace the others by the sheer force of its numbers. This is called law of mass action . This is largely what occurs with the addition of cationic fertilisers ( potash , lime ). As the soil solution becomes more acidic (low pH , meaning an abundance of H ),

15008-462: The soil where it is consumed and levels of carbon dioxide in excess of above atmosphere diffuse out with other gases (including greenhouse gases ) as well as water. Soil texture and structure strongly affect soil porosity and gas diffusion. It is the total pore space ( porosity ) of soil, not the pore size, and the degree of pore interconnection (or conversely pore sealing), together with water content, air turbulence and temperature, that determine

15142-502: The soil, a complex feedback which is exemplified in the dynamics of banded vegetation patterns in semi-arid regions. Soils supply plants with nutrients , most of which are held in place by particles of clay and organic matter ( colloids ) The nutrients may be adsorbed on clay mineral surfaces, bound within clay minerals ( absorbed ), or bound within organic compounds as part of the living organisms or dead soil organic matter. These bound nutrients interact with soil water to buffer

15276-414: The soil, possibly making the soil less fertile. Plants are able to excrete H into the soil through the synthesis of organic acids and by that means, change the pH of the soil near the root and push cations off the colloids, thus making those available to the plant. Cation exchange capacity is the soil's ability to remove cations from the soil water solution and sequester those to be exchanged later as

15410-478: The sports first two-time champion Jack Young who won in 1951 & 1952. Currently, no world team championship is contested for senior riders. The first such championship was the Speedway World Team Cup , which was contested annually from 1960 to 2000. It was replaced by the Speedway World Cup , another annual event, in 2001. Both competitions featured teams from the major speedway countries, usually in

15544-439: The start line and extending back at least 1 metre (3.3 ft). Additional rules govern the placement of warning systems such as lights and also the construction of the starting mechanism. The minimum track width is 10 metres (33 ft) on the straights and the bends must be at least 14 metres (46 ft) wide. The minimum widths give each rider adequate space to safely navigate the track. The start line and starting gate assembly

15678-409: The strength of anion adhesion is as follows: The amount of exchangeable anions is of a magnitude of tenths to a few milliequivalents per 100 g dry soil. As pH rises, there are relatively more hydroxyls, which will displace anions from the colloids and force them into solution and out of storage; hence AEC decreases with increasing pH (alkalinity). Soil reactivity is expressed in terms of pH and

15812-428: The surface. Tracks are watered before and, if needed, during meetings to prevent the surface becoming too dry and to protect the public and the riders from dust. Safety requirements include the use of suspended wire fences, air fences and wooden fences. Air fences are made up of inflated panels installed on the bends. The fence is designed to dissipate energy by allowing an impacted area to compress and transfer air into

15946-450: The track boundaries. Once a race is under way, no rider can receive outside assistance, including push-starts , from others. Historically, pushers were allowed at the start of the race. A white line at the 30-metre mark used to designate the extent to which a push was allowed but due to safety concerns, assistance is now illegal. Occasionally races can consist of up to six riders but this is rare as most tracks are too narrow to accommodate

16080-491: The two concentrations are equal, they are said to neutralise each other. A pH of 9.5 has 10 moles hydronium ions per litre of solution (and also 10 moles per litre OH ). A pH of 3.5 has one million times more hydronium ions per litre than a solution with pH of 9.5 ( 9.5 − 3.5 = 6 or 10 ) and is more acidic. The effect of pH on a soil is to remove from the soil or to make available certain ions. Soils with high acidity tend to have toxic amounts of aluminium and manganese . As

16214-418: The two sections were amalgamated and Vic Huxley proved to be the winner. Huxley was also runner-up three times and won the first British Match Race championship in 1931. Speedway racing typically took place on purpose-built tracks, although in Australia bikes shared larger speedways with Sprintcars , Speedcars (Midgets) and saloons, with tracks traditionally ranging from 1/3-mile showground tracks, such as

16348-473: The void part of the soil volume and is occupied by gases or water. Soil consistency is the ability of soil materials to stick together. Soil temperature and colour are self-defining. Resistivity refers to the resistance to conduction of electric currents and affects the rate of corrosion of metal and concrete structures which are buried in soil. These properties vary through the depth of a soil profile, i.e. through soil horizons . Most of these properties determine

16482-553: The water content of the soil, as can be expressed in terms of volume or weight—can be based on in situ probes (e.g., capacitance probes , neutron probes ), or remote sensing methods. Soil moisture measurement is an important factor in determining changes in soil activity. The atmosphere of soil, or soil gas , is very different from the atmosphere above. The consumption of oxygen by microbes and plant roots, and their release of carbon dioxide, decreases oxygen and increases carbon dioxide concentration. Atmospheric CO 2 concentration

16616-461: The weathering of lava flow bedrock, which would produce the purely mineral-based parent material from which the soil texture forms. Soil development would proceed most rapidly from bare rock of recent flows in a warm climate, under heavy and frequent rainfall. Under such conditions, plants (in a first stage nitrogen-fixing lichens and cyanobacteria then epilithic higher plants ) become established very quickly on basaltic lava, even though there

16750-476: The whole soil atmosphere after a drought period, or when soil is excavated, a bulk property attributed in a reductionist manner to particular biochemical compounds such as petrichor or geosmin . Soil particles can be classified by their chemical composition ( mineralogy ) as well as their size. The particle size distribution of a soil, its texture, determines many of the properties of that soil, in particular hydraulic conductivity and water potential , but

16884-430: The world. In 1926 Johnnie Hoskins took his Speedway show to Sydney's Royal Showground. A very wet Sydney summer nearly sent Hoskins broke, so he took the show on the road to Perth, where one good season made him wealthy again. He and his riders decided to take the show to England, as the word had spread about this exciting sport. 14 April 1928, Johnnie Hoskins, 13 Australian Riders and their motorcycles sailed from Perth on

17018-588: Was a huge success and its promoter was New Zealand-born John S. Hoskins. These pioneers introduced the Speedway signatures of No Left Footpeg and the Steel Shoe, ironically fashioned from worn coal shovels, manufactured in this Steel region. Following the success of Maitland, Speedway meetings were conducted at Newcastle Showground in 1924. These events were very successful and led to the construction of Newcastle Speedway off Darling Street, Hamilton. Johnnie Hoskins became

17152-419: Was also the home of football and greyhound racing. The tight speedway track meant that turf had to be brought on to make the corner flag area for football matches and removed once the match had finished. The 'Wasps' nickname was dropped after 1972 with the team simply called Newport . Stars of the former team included Australian Phil Crump , father of world champion Jason Crump . The team finished third during

17286-550: Was at the West Maitland Showground, whose first speedway meeting was staged on 15 December 1923. This track had a motorcycle riding entrepreneur as its Secretary and his personal account has him inviting his friends and their associates to do a few laps one Sunday morning, the noise attracted the attention of the Showground committee and approval to race at the "Electric Light Festival" was won. Motorcycle racing under lights

17420-481: Was established in 1982 and has ten teams. At the end of each season the top four teams ride in the play-offs in semi-finals and a final and the winner of the final are the Elitserien champions. The team finishing bottom of the league are relegated to the National league (Allsvenskan). The Allsvenskan has seven teams and before the introduction of the Elitserien in 1982 was the top flight speedway league in Sweden. As with

17554-408: Was held at Newcastle Showground in 1926. Ironically it was won by American rider Cec Brown. Visiting English and American racers were common, for they were highly paid showmen, often winning a year's salary in just one night. It was very successful, so Newcastle Showground held the championship again in 1927. Very fitting that Newcastle Showground held the first National Speedway Championship anywhere in

17688-401: Was put up for sale but after talks with the only interested party, Phil Morris, an agreement could not be reached and on 17 February 2012 promoter Steve Mallett confirmed the club would fold with immediate effect. The club shortly after was vandalised and the victim of an arson attack which devastated the stadium leading to it being demolished and redeveloped by owners MCL and speedway was lost to

17822-549: Was stopped in an emergency situation by removing the plug lead from the spark plug or shutting off the fuel supply. Races (known as heats) consist of four riders racing over four laps from a standing start . Riders wear different coloured helmets, traditionally in team events red and blue denote home team riders, and white (in British speedway, green has previously been used as an alternative to white, apparently for early interactive TV) and yellow/black quartered colours (latterly plain yellow) denote visiting riders. The starting area

17956-633: Was the third meeting held at High Beech on 9 April 1928, where Colin Watson , Alf Medcalf and "Digger" Pugh demonstrated the art for the first time in the UK. Proto speedway was staged in Glasgow at the Olympic Stadium (Glasgow Nelson) on 9 April 1928 and the first fully professional meeting was staged at Celtic Park on 28 April 1928. The first meeting in Wales was staged at Cardiff White City on Boxing Day 1928. In

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