New research findings could lead to more accurate interpretation of phosphorus soil tests from Western Australian cropping paddocks, and may save growers money through the recommendation of lower phosphorus fertiliser rates... The research has been conducted by Department of Agriculture and Food (DAFWA) and Murdoch University researchers under the Grains Research and Development Corporation (GRDC) project 'Better fertiliser decisions for cropping systems in Western Australia'... The aim of the project 'Better fertiliser decisions for cropping systems in Western Australia' is to help growers and advisers maximise returns from their investment in fertiliser, and better define critical soil concentrations for nitrogen, phosphorus, potassium and sulphur, as well as minimise the loss of nutrients to the environment...
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There is uncertainty about returns to be obtained from fertiliser investment... In Western Australia, fertiliser now represents about one-third of the costs of growing grain crops... Updated critical values for soil tests will help improve test interpretation to inform better fertiliser decisions...