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1.二元复混肥中氮、磷、钾中之二种总养分含量大于或等于20%,三元复混肥中氮、磷、钾总养分大于或等于25%。组成复混肥料的某一单元素养分含量不低于40%。2.选择氮、磷、钾比例时,要考虑土壤条件(土壤中氮、磷、钾状况和供肥状况)、作物吸肥特性(作物品种、吸肥规律等)等。同时也应考虑肥料自身特点(如掺后变化、碱性肥料勿用于盐碱地,含氮肥料勿用于烟草、果树、马铃薯等忌氮作物等)。一般来讲,作物所需氮素的40-60%,磷和钾的全部应包含在专用肥配方中。
1. Binary compound fertilizer nitrogen, phosphorus and potassium in two kinds of total nutrient content is greater than or equal to 20%, ternary compound fertilizer nitrogen, phosphorus and potassium total nutrients greater than or equal to 25%. The composition of a single fertilizer element fertilizer nutrient content of not less than 40%. 2. Select the proportion of nitrogen, phosphorus and potassium, we must consider the soil conditions (nitrogen, phosphorus and potassium in soil conditions and the status of the supply of fertilizer), the characteristics of crop absorption (crop varieties, absorption of law, etc.). Fertilizers should also be considered their own characteristics (such as changes after mixing, alkaline fertilizers are not used for saline-alkali soil, nitrogenous fertilizers are not used in tobacco, fruit trees, potatoes and other nitrogen-consuming crops, etc.). In general, 40-60% of the crop’s required nitrogen, all of the phosphorus and potassium should be included in the formula fertilizer.