Targeted inputs make sense

摘要

Farmers can save money and help the environment by targeting fertiliser nitrogen applications to ensure the correct quantity is applied at the correct time. CSIRO research is revealing more about the timing of crop nitrogen demand and the amounts andtiming of nitrogen supply from soil, fertiliser and pasture and crop residues. Trials have shown perennial grass residues speed soil nitrogen mineralisation while continuous cropping reduces mineralisation rates. In addition, researchers found cultivation and stubble management have no significant impact on mineralisation. Optimum nitrogen management means balancing crop nitrogen demand with the supply from soil and fertiliser. Farmers can use the balance between soil nitrogen supply and crop nitrogen demand to calculate nitrogen fertiliser requirements using tools such as the Lime and Nutrient Balance software package.