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Catalogue: GRDC Factsheets
Applying P at depth (15 to 20cm deep on 50cm bands) can improve yields over a number of cropping seasons (if other nutrients are not limiting)... Limited P is now constraining yields in parts of the northern grains region, particularly in the vertosols (black and grey cracking clays)... The test needs to be done only every four to six years, and is most important in the subsoil layers...
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Catalogue: GRDC Factsheets
KEy points After decades of consistent phosphorus (P) application, many soils in the western region now have adequate P status... The DGT measurement incorporates the initial soil solution P concentration, as well as the ability of the soil to resupply the soil solution pool in response to the removal of P. In this way, it is designed to mimic the action of plant roots so is a better method of predicting plant P requirements than methods based on chemical extractions, for example, Colwell-P... Soil tests conducted by Buntine grower Stuart McAlpine showed P at double the critical levels advised by CSIRO's Mike Wong...
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Catalogue: GRDC Factsheets
KEy pointS After decades of consistent phosphorus (P) application, many soils in the southern region now have adequate P reserves... As a result of this, along with high rates of P fertiliser being regularly applied, many soils in the southern grains region now have good soil P reserves... In a situation where 12 kilograms per hectare of applied P on 15 to 18cm row spacing has been recommended, the same result may be achieved with 9kg/ha of applied P if the crop were seeded on 25 to 30cm row spacing...
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