Trace elements is essential for plant growth, but are relatively small amount of elements, mainly iron, copper, zinc, manganese, molybdenum, boron, etc. Trace elements content in crops is less, but because they are within the plant is part of the enzyme or coenzyme, strong specificity, crop growth and development is indispensable and should not substitute. Therefore, when crop lack of any a kind of trace elements, growth will be subdued, resulting in a decline in production and quality, serious precipitously. On the other hand, if too much of these elements, and there will be a phenomenon of poisoning, affecting crop yield and quality, will also cause the occurrence of some of the people and animals endemic diseases.