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旱地小麦增施钾肥后 ,使单株次生根和叶面积增加 ,增强了植株抗旱能力 ;增施钾肥能缩短籽粒灌浆渐增期的时间 ,提高灌浆快增期的灌浆速率 ,使粒重明显增加 ;旱地小麦钾肥的适宜用量以 150 kg/ hm2～ 2 2 5kg/ hm2为宜 ,若施钾过量则增产效益有下降趋势。
The increase of K fertilizer increased the secondary root and leaf area per plant and enhanced drought tolerance of wheat plants in dryland. Increasing potash fertilizer could shorten the period of gradual increase of grain filling and increase the grain filling rate of grain filling and increase grain weight The suitable amount of potash fertilizer for dryland wheat was 150 kg / hm2-225 kg / hm2, while if potassium was used excessively, the yield-increasing benefit decreased.