Potassium management for sugarcane on base saturated soils in northern New South Wales
AN industry-wide survey of the nutrient status of sugarcane crops in 2000–01 showed leaf potassium (K) levels in most samples from New South Wales were well below the critical value. There were no data to indicate the significance of this information for crop yield and future K management. In 2002, rates of K fertiliser experiments were established at two sites in the Broadwater Mill area on clay soils where exchangeable K was 0.13–0.14 cmol(+)/kg and nitric K was 0.78–1.04 cmol(+)/kg. Calcium (Ca) + magnesium (Mg) saturation was 91–95% of total bases.