钾是植物必需的大量营养元素之一。钾对植物的正常生长发育、产量形成、抗逆性及品质等均有重要影响。目前,土壤缺钾或钾素收支不平衡已经成为作物产量和品质进一步提高的障碍。研究表明,南方地区大约有2/3的水稻土和1/2的旱地土壤缺钾,长江以南地区缺钾面积约占全国缺钾面积的80%。在北方,土壤自西向东供钾能力逐渐降低,固钾能力逐渐增强,存在明显地带性分 Potassium is one of the macronutrients that plants need. Potassium has an important impact on the normal growth and development of plants, yield formation, stress resistance and quality. At present, imbalance in potassium or potassium balance in the soil has become an obstacle to the further improvement of crop yield and quality. Studies show that about two-thirds of the paddy soil and ½ dryland soil in the southern region have potassium deficiency, and potassium deficiency in the south of the Yangtze River accounts for about 80% of the national potassium deficiency area. In the north, the ability of potassium supply from the west to the east decreased gradually, and the capability of fixing potassium increased gradually. There was obvious zonation