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本文通过盆栽试验和大田试验研究了不同生育期水稻施用钾肥对产量形成的影响。结果表明，分蘖期与孕穗期是钾营养的敏感期，施用钾肥可分别有利于有效穗形成与粒数粒重的增加。钾肥的增产效应以孕穗期最好，作基肥最差。分蘖期植株含钾量和孕穗期植株的Ｋ／Ｎ与稻谷产量有极显著相关，由此提出了水稻各生育期钾素营养丰缺的诊断指标。
In this paper, pot experiments and field experiments were conducted to study the effects of potash fertilization on yield formation at different growth stages. The results showed that tillering stage and booting stage were the sensitive periods of potassium nutrition. The application of potassium fertilizer was beneficial to the formation of effective panicle and the increase of grain weight per plant. The yield-increasing effect of potash is the best at booting stage, and the worst basal fertilizer. The potassium content in the tillering plants and the K / N ratio of the plants at the booting stage had a very significant correlation with the grain yield. Therefore, the diagnostic indexes for the abundance of potassium in different growth stages of rice were proposed.