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soil test interpretation

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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 Research Summaries
Despite the expense, fertiliser decisions made by grain growers do not always rely on soil test knowledge as part of a suite of knowledge sources contributing to a rate recommendation... This reflects a significant level of scepticism among some grain growers and advisors that soil testing does not explain crop response, that the recommendations provided using a soil test are flawed due to biased data, or both... The data were stored in a single central repository for access by approved users through an online query tool, the BFDC Interrogator...
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Catalogue: GRDC Research Summaries
Despite the expense, fertiliser decisions made by grain growers do not always rely on soil test knowledge as part of a suite of knowledge sources contributing to a rate recommendation... This reflects a significant level of scepticism among some grain growers and advisors that soil testing does not explain crop response, that the recommendations provided using a soil test are flawed due to biased data, or both... The data were stored in a single central repository for access by approved users through an online query tool, the BFDC Interrogator...
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