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复合肥料是含有多种矿质营养元素的工业化肥,有固体和液体两类。我国从七十年代中期开始,研制了几种氮、磷、钾“三元”复合肥料,在苹果树上施用,取得了良好的效果。我国生产的氮、磷、钾复合肥料,有效成分的配比,按氮—五氧化二磷—氧化钾计算时,复肥732为2—1.38—1.34,复肥733为2—1.09—0.55。这两种复合肥料,都是由硝酸、硫酸分解磷矿,再添加硫酸钾制成的。
Compound fertilizers are industrial fertilizers that contain a variety of mineral nutrients, both solid and liquid. Since the mid seventies of our country, several nitrogen, phosphorus and potassium “ternary” compound fertilizers have been developed and applied on apple trees and achieved good results. China’s production of nitrogen, phosphorus and potassium compound fertilizers, the ratio of active ingredients, calculated according to nitrogen - phosphorus pentoxide - potassium oxide, compound fertilizer 732 is 2-1.38-1.34, compound fertilizer 733 is 2-1.09-0.55. These two kinds of compound fertilizers are made of nitric acid and sulfuric acid to decompose phosphate rock and then add potassium sulfate.