微量元素指土壤中含量很低的化学元素,含量范围一般为:n×10~(-4)-n×10~(-3)％,很少超过n×10~(-1)％的。有的微量元素有生物学意义,即生物正常生长和生活所不可缺少的化学元素,亦即微量营养元素,植物必需的营养元素应具备下列条件: (1) 缺少它不能完成营养生长和生 Trace elements are chemical elements with very low contents in soil. The content of trace elements is generally: n × 10 -4 -n × 10 -3%, rarely exceeding n × 10 -1%. Some trace elements have biological significance, namely biological normal growth and life indispensable chemical elements, that is, micronutrients, plant essential nutrients should meet the following conditions: (1) the lack of it can not complete the nutritional growth and health