Simulating water and nitrogen runoff with APSIM

To determine the impact of potential reductions terrain-targeted nitrogen (N) fertilisation rates on N losses a simulation study was carried out using Agricultural Production Systems Simulator (APSIM). simulate runoff simple approach used, in which is based concentration soil solution and an extraction coefficient. Firstly, APSIM parameters that have largest effect water were determined for terrains with different slopes poorly drained silt loam. A sensitivity analysis then conducted to assess hydraulic properties organic carbon content losses. Finally, set up pasture production dynamics (including uptake, leaching runoff) farm rolling hills South Canterbury, New Zealand. Two approaches either scheduled or aboveground pasture. For loam, rainfall intensity surface conductance had highest amount lost by runoff. Soil conductivity at saturation field capacity, as well plant available also controlled N, while topsoil less Both coefficient depth considered exchange affected via Using prior positive effects yield reduced