微量元素(锰、锌、铜、钼、硼等)为植物正常生活所必需。在缺乏微量元素的土壤上栽培农作物产量很低,为了保证丰产必须施用微量肥料(含有微量元素的肥料)。植物体内微量元素的不足,可能由于它们生长的土壤中缺乏这些元素;但往往不是完全缺乏,而是微量元素以不溶解的状态存在,因而这些物质不能为植物所利用。例如土壤中石灰含量 Trace elements (manganese, zinc, copper, molybdenum, boron, etc.) are necessary for the normal life of plants. Crops are poorly grown on soil lacking trace elements and trace fertilizers (trace element-containing fertilizers) must be used to ensure high yields. The lack of trace elements in plants may be due to the lack of these elements in the soils they are grown in; however, they are often not completely lacking, but the trace elements are present in undissolved and therefore they are not available to the plant. For example, the amount of lime in the soil