“庄稼缺少钾,肯定产量差。”由于有机肥料施用少,氮、磷肥过量,加上土地复种指数高和雨水淋溶,在南方广大地区和北方部分地区,土壤缺钾面积年益扩大、加重,缺钾已成为这些地区作物高产的限制因素。科学测定表明,土壤中有效钾含量在50～80ppm以下,为极缺钾土壤,施钾肥增产最显著;80～120ppm,为一般缺钾土壤,施钾肥有明显增产效果;120～ “The crop lacks potassium and is certainly poor in yield.” Due to the low application of organic fertilizers, excess nitrogen and phosphate, combined with high crop multiplication index and rainwater leaching, the area of ​​potassium in the soil is expanding and aggravating in the vast areas of southern and northern parts of China , Potassium deficiency has become a limiting factor for high crop yields in these areas. Scientific tests show that the available potassium content in the soil is below 50-80ppm, which is extremely deficient in potassium soils, and the most obvious yield increase is in the application of potassium fertilizer; 80-120ppm is generally potassium deficient soils,