The sequence of the model factor effects (N>K>P) and the relation between high yield and fertilizer application, and the mutual functions among the yield factors of various fertilizers.
2
氮肥的边际产量随着钾肥用量的增加而增加的现象说明，钾肥对氮肥施用的有效性具有积极的作用。
The increase in the MPP of nitrogen as potash application levels are increased is an indication of the positive impact that potash has on the effectiveness of nitrogen.
3
特别是氮肥用量的增加具有提高钾肥边际产量的作用。
In particular, an increase in the amount of nitrogen applied has the effect of increasing the MPP of potash.
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