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在大田条件下，研究了低钾土壤中钾营养对水稻不同品种谷粒产量，干物质积累特性及光合作 用的效应。结果表明：在不施钾条件下，低钾敏感品种谷粒产量显著降低，抽穗后２周内ＲＧＲ， ＣＧＲ和 ＮＡＲ均低。而低钾耐性品种在低钾营养条件下有高的产量，这与ＮＡＲ高、冠层ＬＡＩ的分布合适以及较 低的大田消光系数和一天中各时间的光合速率高有关，试验还发现在群体条件下黄熟期水稻冠层有明 显的光合“午睡”，低钾敏感品种无钾供应时“午睡”加剧。
Under field conditions, effects of potassium nutrition in low potassium soil on grain yield, dry matter accumulation and photosynthesis of different rice varieties were studied. The results showed that the grain yield of low potassium sensitive varieties significantly decreased under the condition of no potassium application, and both of RGR, CGR and NAR were low within 2 weeks after heading. However, the low potassium tolerant cultivars had high yield under low potassium nutrition, which was related to the high NAR, the suitable distribution of canopy LAI, and the lower field extinction coefficient and the higher photosynthetic rate at different times of the day. In the experiment, Under the conditions of yellow ripening rice canopy photosynthesis “nap”, potassium-sensitive varieties without potassium supply, “nap” intensified.