SUBSOIL testing for phosphorus (P) levels may help save farmers money in fertiliser costs. According to the Grains Research and Development Corporation, testing subsoil (10-30cm) P levels using the Colwell-P and BSES-P tests across the farm is the key to making an informed decision about fertiliser application rates. If those 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.
The GRDC Crop Nutrition Fact Sheet can be downloaded at grdc.com.au, just search for "PhosphorusManagement".
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