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采用大区对比的方法，在氮磷肥常规用量为225kg／hm2的情况下，对正茬、迎茬、重茬地大豆进行施钾肥试验，及不同量级钾肥应用效果试验。结果表明，施钾肥的大豆均比对照增产，且抗病、抗倒伏能力增强，以重茬大豆施钾肥增产最显著；以30kg／hm2钾肥用量最佳，增产最显著。
Using the method of large area contrast, under the condition of 225kg / hm2 of conventional nitrogen and phosphorus fertilizer, the experiment of applying potassium fertilizer to the soybean crop in the continuous cropping, the continuous cropping and stubble cropping, and the application effect experiment of different grade of potash fertilizer were carried out. The results showed that soybean with potassium fertilizer increased yield and the ability of resistance to disease and lodging increased compared with the control. The yield of potassium fertilizer was the most significant with successive cropping of soybean. The optimum amount of potassium fertilizer with the dosage of 30 kg / hm2 was the most significant increase.