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在旱田作物小麦玉米轮作制度中，进行了三年的钾肥定位试验，采取与小麦秸秆还田措施相结合，并考察了钾肥的增产效果及经济效益，同时分析了土壤钾素的变化情况，针对土壤钾的平衡状况进行了核算。结果表明：在产量较高时，施钾可明显提高小麦玉米的产量，增产幅度可达１８．２％，１４．７％。施钾配合秸秆还田增产效果最佳。不使用钾肥，土壤钾素处于不平衡状态，速效钾含量呈下降趋势。在现有产量水平下，每年亩施２０公斤氧化钾土壤钾素可基本保持平衡。若采用小麦秸秆还田措施，钾肥用量可以减半
In the field crop wheat rotation system, we conducted three years of potash locating experiment, combined with the wheat straw returning measures and investigated the yield increase and economic benefits of potash fertilizer. At the same time, we analyzed the changes of soil potassium, Soil potassium balance was accounted for. The results showed that when the yield was high, the yield of wheat and corn could be obviously increased by increasing the yield by 18.2% and 14.7% respectively. K fertilization with straw return to yield the best. Without potassium, soil potassium is in an unbalanced state, while available potassium is in a downward trend. Under the current output level, 20 kg of potassium per year K soil potassium can be basically balanced. If using wheat straw to soil measures, the amount of potash can be halved