Different K rates 0,18.75,37.5,75,112.5kg/ha, under the same conditions the amount of nitrogen and phosphorus fertilizer on yield and economic benefits of local cultivars Siyueman. The results show that the applied potassium fertilization treatment yield were higher than control. Application of potassium fertilizer yield was increased by 16. 3 to 33.7 percent, applied potassium fertilization within a certain range, the more higher the yield, but to a certain extent with the applied potassium fertilization amount increased, output declined, K 75 kg/hm2 rates the yield of Chinese cabbage 67736.7 kg/hm2, and economic benefits than in the control of new income 31,810. 0 yuan/ha, equation between potassium application rate and Chinese cabbage effect was y = 50452 ＋ 495.85 x - 3.77x2, and thus obtained the highest yield of Chinese cabbage was 65.76 kg/ha, the best value for economic benefits of potassium fertilizer was 65.36 kg/ha.%以当地主栽品种四月蔓为材料，在氮磷肥用量一致的条件下，研究不同钾肥用量（0、18．75、37．5、75、112．5kg／hm2）对产量及经济效益的影响。结果表明施钾肥处理的产量均高于对照。施钾肥产量较对照提高16．3％-33．7％，在一定范围内施钾肥越多产量越高，但增加到一定程度后随施钾肥量增加，产量呈下降趋势，当钾肥用量为75kg／hm2时，油白菜产量达67736．7kg／hm2，经济效益较对照新增收31810．0元／hm2。钾肥用量与油白菜的效应方程为Y=50452＋495．85x-3．77x2，由此求出油白菜最高产量的钾肥用量为65．76kg／hm2，最佳经济效益施钾肥量为65．36kg／hm2。
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