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soil availability

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Catalogue: GRDC Updates (West)
" Managing nutrition on soils that have been treated for water repellence by cultivation.. A comparison of N uptake at 10 N and 50 N showed significant increases in N uptake in the nil and banded wetter though not in mouldboard and spading... The results suggest that soil nitrogen is more available in the mouldboard and spading treatments than in the nil and banded wetter...
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Catalogue: GRDC Updates (West)
Mention of a trade name or company in this publication does not imply endorsement of any product or company by the Department of Agriculture and Food, Western Australia... Overall, the production and supply of fertiliser accounted for a large proportion (35%) of the GHG produced from wheat production, and occurred in the pre-farm stage (Table 1)... Overall, constraints have a far smaller effect on heavy soils than on sand plain soils...
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Catalogue: GRDC Updates (West)
Soil acidity, water repellence and root disease have been shown to reduce crop access to soil P and where these constraints are present yield responses to fertiliser P have occurred even where soil test P levels are classed as sufficient... Recent research has shown that the majority of soils tested from the Western Australian cropping area have a sufficient level of soil phosphorus... Recent work has shown that where soil pH (CaCl2) is less than 4.6, moderate water repellence occurs (WDPT > 4 minutes) or root disease is present, crop access to soil P can be restricted and the efficiency of use of P fertiliser is less than treatments where these constraints do not exist...
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Catalogue: GRDC Updates
Mitscherlich equation is currently used to define the Colwell-P soil test - crop response relations for crop species, soil type and seasonal combinations... The paper presents an alternative equation to defining Colwell-P soil test critical levels for wheat which overcomes this problem and will result in a more profitable and environmental sustainable wheat production system... Where, RY is relative yield; a, b, and c are constants; and Colwell-P is soil P measured for the 0-10 cm layer by the procedure of Colwell (1963)...
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