硫铵(NH4)2SO4含氮的质量分数；28/132 * 100% = 21.2%尿素CO(NH2)2含氮的质量分数28/60 *100% = 46.7%设X吨硫酸铵的含氮量语1吨尿素的含氮量相当X*21.2% = 1吨 *46.7%X = 2.203吨
