The old calculation formula for fertilizerrequirement did not fit to fertilizerrequirement.
原需肥量计算公式纯粹是利用率不妥计算的逆运算。
2
There was a range for parameters of fertilizerrequirement, so it should be adjusted according to soil fertility and yield.
需肥量参数具有较大幅度的变化，应按照土壤肥力以及产量目标来合理调整并确定这个重要参数。
3
Based on the present status of decreasing marketing in chemical fertilizer, a primary prediction of fertilizerrequirement in future 5~15 years is made at home and abroad.