钾是水稻营养三要素之一。大约每生产100公斤稻谷,需要氮素1.7—2.5公斤、磷酸0.9—1.3公斤、氧化钾2.1—3.3公斤,所需氮、磷、钾之比为1:0.5:1.3。可见,水稻对钾的需求量比氮、磷还多。仅靠土壤钾,往往满足不了水稻需要。南方稻区近十几年来,由于有机肥料投入量逐年大幅度下降,有机肥料与化肥投入量,已由前5—6年 Potassium is one of the three elements of rice nutrition. About 100 kg of rice is produced per year, requiring 1.7-2.5 kg of nitrogen, 0.9-1.3 kg of phosphoric acid and 2.1-3.3 kg of potassium oxide. The required ratio of nitrogen, phosphorus and potassium is 1: 0.5: 1.3. Visible, rice demand for potassium than nitrogen, phosphorus and more. Soil potassium, often can not meet the needs of rice. In the past ten years in the southern rice area, the input of organic fertilizers and chemical fertilizers have been reduced from the first five to six years