土壤中钾的含量一般是氮、磷的10倍以上,所以,当土地复种指数一般,氮、磷化肥施用量较低时,植物往往不缺钾,钾肥效果也不十分明显。但是,近10多年来,由于氮肥猛增,磷肥用量不断提高,从而增加了植物对土壤中钾的摄取量,打破了土壤中钾素的平衡,这是导致植物生长中缺钾和出现缺钾症的重要原因。由于我国化学钾肥短缺,施用钾肥年限也不长,所 Soil potassium content is generally more than 10 times that of nitrogen and phosphorus, so when the general index of land multivariate, nitrogen and phosphorus fertilizer is low, the plants often do not lack of potassium, potassium effect is not very clear. However, in the recent 10 years, due to the rapid increase of nitrogen fertilizer, the amount of phosphate fertilizer increased continuously, which increased the uptake of potassium into the soil by plants and broke the balance of potassium in the soil, which led to the shortage of potassium and the shortage of potassium in plant growth An important reason for the disease. Due to the shortage of chemical potash in China, the potash application is not long enough