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soil status

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Catalogue: GRDC Updates
Many soils may already have lost much of this extra, slow release P reserve... Soil testing for available P status commonly involves a Colwell test on the 0-10 cm layer... The paper summarises some recent work that attempts to quantify the differences in availability of sparingly soluble P sources as affected by soil acidification...
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Catalogue: GRDC Media
Dr Mike McLaughlin, a GRDC Southern Regional Panel member, says having soils tested to assess their P status could save growers significant input costs this year... Lower than normal maintenance rates of fertiliser P will in some instances be sufficient this coming season... Having soils tested to assess their P status could save growers significant input costs, says Grains Research and Development Corporation (GRDC) Southern Regional Panel member Dr Mike McLaughlin...
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Catalogue: GRDC Media
Dr Mike McLaughlin, a GRDC Southern Regional Panel member, says having soils tested to assess their P status could save growers significant input costs this year... Lower than normal maintenance rates of fertiliser P will in some instances be sufficient this coming season... Having soils tested to assess their P status could save growers significant input costs, says Grains Research and Development Corporation (GRDC) Southern Regional Panel member Dr Mike McLaughlin...
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Catalogue: GRDC Media
Soil testing the key to fertiliser savings.. According to the Crop Nutrition Fact Sheet published recently by the Grains Research and Development Corporation (GRDC), results from more than 100,000 recent soil tests in the south-west of WA showed that most growers are operating at or above the soil P levels required... If the tests show that soil P status is sufficient, there may be an opportunity for growers to save money on P fertiliser by cutting back to a maintenance rate...
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Catalogue: GRDC Media
After decades of consistent phosphorus (P) fertiliser application, many Western Australian soils now have adequate P status, presenting an opportunity for farmers to save on input costs... Testing subsoil (10 to 30 centimetres) P levels using both the Colwell-P and BSES-P tests across the farm is the key to making an informed decision about fertiliser applications rates... Region West, North, South < Keep browsing 0 Responses to Soil testing the key to fertiliser savings..
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Catalogue: GRDC Updates
Figure 1: Effects of (a) application of an additional 40-60 kg P/ha to soils prior to planting, relative to normal starter P applications alone; and (b) placing that additional P deeper in the soil profile (15-20cm), compared to surface (5-7cm) bands... half of the soil P removed by cropping comes from below the top 10cm and about 90% of that removed P comes from forms/pools of P not measured in the Colwell (bicarbonate P) soil test; and (ii) when luxury rates of P are applied annually , >95% of the residual P stays in the top 10cm of the profile and the depletion of the subsoils continued unchanged... , we used a bioassay to assess how much of the P in the various pools was actually available for plant uptake, and how well this correlated with what the Colwell test predicted...
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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 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 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...
Related categories:
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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