From fertiliser applied and nutrients removed by the harvest, compute apparent N, P and K use efficiency by the difference method to quantify uptake efficiency and losses.
化肥利用率估算工具,採用差減法計算氮、磷、鉀養分的表觀利用率,通過施肥量、作物吸收量與土壤基礎供肥量評估肥料被作物吸收的比例,輔助測土配方施肥與肥料效果評價。
肥料利用率 = (施肥區養分吸收量 − 不施肥區養分吸收量) / 施肥量 × 100%。