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复混肥料的品种繁多,养分含量差异很大。盲目施用必然造成某些营养元素过量,而另一些营养元素不足,最终导致作物产量和施肥效益的下降。如何根据作物需肥量和复混肥的养分含量计算出肥料的用量呢?举例说明于下:如每亩施化肥总量氮(N)12公斤、五氧化二磷(P_O_5)5公斤,氧化钾(K_2O)4公斤,其中磷、钾养分全部作基肥,氮肥的一半作追肥,即基肥中需施 N 6公斤,P_2O_5公斤,K_2O_4公斤,若施用的复混肥品种是含 N 13%、P_2O_5 10%、K_2O 20%的三元复混肥,其计算步骤如下:①算出4公斤K_2O 的三元复混肥数量。即三元复混肥数量=4÷20%=20(公斤)。②算出20公斤三元复混肥
Variety of compound fertilizers, nutrient content vary widely. Blind application inevitably leads to over-abundance of some nutrients while others are deficient and eventually leads to a decline in crop yields and fertilizer benefits. How to calculate the amount of fertilizer according to the amount of fertilizer needed and the nutrient content of the compound fertilizer? For example: Under the condition of a total of 12 kg of nitrogen (N), 5 kg of phosphorus pentoxide (P_O_5) Potassium (K_2O) 4 kg, of which phosphorus and potassium nutrients for all basal fertilizer, nitrogen fertilizer for top dressing half, that is required to apply N 6 kg, P_2O_5 kg, K_2O_4 kg, if the application of compound fertilizer is N 13% P_2O_5 10%, K_2O 20% ternary compound fertilizer, the calculation steps are as follows: ① calculate the amount of 4 kg K_2O ternary compound fertilizer. The amount of ternary compound fertilizer = 4 ÷ 20% = 20 (kg). ② calculated 20 kg ternary compound fertilizer