Question

一块农田需氮元素15kg,需施用含[(NH4)2SO4]85%的化肥多少kg?

Answer 1

设需施肥x克.

(x*85%) * M(2N) / M ((NH4)2SO4) = 15

0.85 x * 28 / 132 = 15

x = 83.19 (kg)