由于化肥种类多,含某种原素量也不一样,追施多少需要计算。下面介绍一种简易算法。1.若用碳铵追肥,如每亩需6斤氮素,1亩地需施多少碳铵?因百斤碳铵含17斤氮素,就可以这样算:6÷((17)/(100))=35.3斤(碳铵)2.若原来每亩施硫铵30斤,现改用尿素,每亩应施多少斤?因百斤硫铵含氮21斤,百斤尿素含氮46斤,故其计算法是: Due to the variety of fertilizers, including a certain amount of elements are not the same, the amount of top dressing need to be calculated. Here's a simple algorithm. 1. If the use of ammonium bicarbonate top dressing, such as per kilogram of 6 kg of nitrogen required, 1 mu of land required to apply the amount of ammonium bicarbonate? Because of the kilograms of ammonium bicarbonate containing 17 kg of nitrogen, you can count: 6 ÷ ((17) / ( 100)) = 35.3 kg (ammonium bicarbonate) 2. If the original 30 kg per acre ammonium sulfate, urea is now used, how Mu should be applied per acre? Kg, so the calculation method is: