兰州砂田蔬菜施肥现状及钾肥肥效

本文对于兰州市安宁区黄瓜、辣椒、蕃茄和茄子等四种蔬菜作物的施肥状况进行了调查研究．结果表明，氮磷的投入量是蔬菜生产需要量的３～９倍，钾素投入不足．增施钾肥不但可以增加产量，而且可以提高蔬菜果实的品质，增强抗病能力．

Current Situation of Fertilizer Application and Effect of Potassium Fertilizer on Vegetables in Sand-mulched Fields of Lanzhou

The current situation of fertilizer application on cucumber, chilly Pepper, tomato and eggplant in sand-mulched field is that nitrogen and phosphorus were often used 3 to 9 times higher than the required amount. However, the input of potassium(mainly through application of some organic materials) was obviously not enough, resulting in deficient status of soil K. The consequence of over application of N and P and the deficiency in K increase the costs of vegetable production, environmental pollution and weakness of vegetables' resistance to disease. Our experiments with potassium agreed with the results of investigation.