为找出钾肥的最佳施用量及钾肥对蔬菜的增产效果,于1987—1989年在廊坊市安次区的5个生产队进行了田间试验(?)结果如下: 1 施钾效果从黄瓜、蕃茄、大白菜试验结果看出,土壤中有效钾含量越低,增加钾肥效果越好。土壤中有效钾含最在150ppm以下施钾肥,黄瓜每亩可增产15.4—25.1%; In order to find out the best application rate of potash fertilizer and the effect of potash fertilizer on the yield of vegetables, five production teams in Anci District, Langfang City from 1987 to 1989 were tested in the field. The results are as follows: Tomato, Chinese cabbage test results show that the lower the available potassium in soil, the better the effect of increasing potash. Potassium in the soil with the most below 150ppm potassium fertilizer, cucumber yield per acre 15.4-25.1%;