在植物的正常生长发育过程中,氮、磷、钾、钙、镁等营养元素的需要量较大,我们称之为常量营养元素。另有一些元素如钼、铜、锰、铁、锌、硼等,虽在植物体内含量极少,但它们是植物生长发育必不可少的,我们称之为微量营养元素,含有这些元素的肥料称作微量元素肥料,简称为微肥。一般来说,土壤中总是或多或少地含有微量元素,植物生长中所需的微量元素主要从土壤中获得,但因某些土壤中植物所需的某种微量元素偏少,或因该微量元素的存在形式难以被植物吸收,因此就要科学地人工施用微肥, In the normal growth and development of plants, nitrogen, phosphorus, potassium, calcium, magnesium and other nutrients greater demand, we call it a constant nutrient element. Some other elements such as molybdenum, copper, manganese, iron, zinc, boron, etc., although very little in the plant body, but they are essential for plant growth and development, we call them micronutrients, fertilizers containing these elements Called trace element fertilizer, referred to as micro-fertilizer. In general, the soil always contains trace elements more or less, and the trace elements required for plant growth are mainly obtained from the soil. However, due to a certain amount of trace elements required for plants in some soils, The existence of the trace elements is difficult to be absorbed by plants, it is necessary to manually apply the scientific manure,