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在施用氮磷肥的基础上，每亩增施２～１０ｋｇＫ＿２Ｏ，夏玉米单交制种母本棒三叶（主要功能叶）光合速率增加０．３１～０．８３ｍｇ／ｄｍ２·ｈ，光合速率与施钾量之间呈二次曲线回归关系；茎粗增加０．１～０．３ｃｍ，最大叶面积系数增加０．３０～０．４４，空秆率下降３．６～６．６％，穗粒数增加１７．８～３７．５粒，穗粒重增加１３．６～２１．１ｇ，千粒重提高８．０～１６．６ｇ．单交种亩产量提高１８．７～３６．８％．
Based on the application of N and P fertilizers, the photosynthetic rate increased by 0.31 ~ 0.83mg / dm2 · h with the increase of 2 ~ 10kgK_2O per acre. The photosynthetic rate of clover (main functional leaf) There was a quadratic curve regression relationship between the amount of potassium applied; the stem diameter increased 0.1 ~ 0.3cm, the maximum leaf area coefficient increased 0.30 ~ 0.44, the empty stalk rate decreased 3.6 ~ 6.6% The grain number increased by 17.8 ~ 37.5, the grain weight increased by 13.6 ~ 21.1g, the grain weight increased by 8.0 ~ 16.6g. Single cross-species mu yield increased 18.7 ~ 36.8%.