钾是肥料三要素之一，很多蔬菜对钾的需要量往往大于氮、磷，生长良好的蔬菜含钾量为其干物质含量的2.5％－7％，高于氮、磷的含量。大部分蔬菜吸收的钾都比氮多，如黄瓜吸收的氛钾比为1：（1．5－1．7），南瓜为1:21，番茄为1：1．9，茄子为1:（15－165），青椒为1：1.3胡萝卜 Potassium is one of the three elements of fertilizer, many of the vegetables are often greater than the demand for potassium nitrogen, phosphorus, good growth of vegetables, potassium content of its dry matter content of 2.5% -7%, higher than the nitrogen and phosphorus content. Most vegetables absorb more potassium than nitrogen, such as cucumber absorption of the ratio of 1: (1.5-1.7), pumpkin 1:21, tomato 1: 1.9, eggplant 1 :( 15-165), green pepper 1: 1.3 carrot