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求导了水稻目标产量的预测方程，不同氮钾施用水平的等产方程，以及氮钾最佳配比方程。根据上述方程推导出地力产量为6345kg／hm2的水稻田目标产量为8589kg／hm2，N与K2O施用量的最佳配比为11．22，即N139．4kg／hm2、K2O170．6kg／hm2。
The prediction equation of target yield of rice, equation of equal production of different levels of nitrogen and potassium, as well as the optimal proportioning equation of nitrogen and potassium were derived. According to the above equation, the target yield of paddy field with the yield of 6345kg / hm2 was 8589kg / hm2. The best ratio of N and K2O was 11.22, namely N139.4kg / hm2 and K2O170.6kg / hm2.