The optimum application rates was urea 288.2-446.4 kg/hm2, zinc sulfate 60.8- 118.9kg/hm2, manganese sulfate 67 5-127 2 kg/hm2 under this experiment conditions.

在本试验条件下 ,小白菜高产、优质施肥方案为尿素 2 88 2～ 4 4 6 4kg hm2 、硫酸锌 6 0 8～ 118 9kg hm2 、硫酸锰 6 7 5～ 12 7 2kg hm2 。

According to the property of major components in the crude (manganese sulfate and ammonium sulfate), isolation and purification are carried out under laboratory condition by using recrystallization, precipitation and direct heating method.

根据粗品中主要成分(硫酸锰和硫酸铵)性质的不同,采用了结晶法、沉淀法和直接加热法进行实验室条件下的分离纯化。