Amino acid trace elements include boron, zinc, molybdenum, iron, manganese, copper and other nutrients. Although the amount of trace elements required by plants is small, their effects on the growth and development of plants are as important as a large number of elements. When certain trace elements are deficient, the growth and development of crops are significantly affected, resulting in reduced yield and quality. On the other hand, excessive trace elements will poison crops, which may affect the yield and quality, or even endanger human and animal health in serious cases. With the increase of crop yield and the application of chemical fertilizer, the application of trace element fertilizer becomes more and more urgent. In microelement fertilizer, the sulfate of iron, manganese, zinc, copper, boric acid, molybdate and its monovalent salt are commonly used.