Wheat and Lupin Potassium Responses

The Better Fertilizer Decisions for Crops project identified gaps in the dataset for wheat and canola responses to K in eastern Australia. This project will support additional soil measurements of selected K fertilizer application rate experiments in southwestern Victoria, undertaken by the New South Wales Department of Primary Industries. Soil measurements will include the tetra-phenyl borate extractable K, ammonium acetate exchangeable K, and bicarbonate-extractable K taken at several depths. Selected clay mineralogy assessments will also be made to better evaluate the effect of clay type on response. The accompanying field experiments have not yet been harvested.