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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inadequate soil supply
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