针对玉溪市农业生产上出现的一些由微量元素缺乏引起的作物生理性缺素症 ,开展耕作土壤有效态微量元素含量状况普查。结果显示 ,玉溪市绝大部分 (占 90 .8% )耕作土壤有效硼含量小于 0 .5 0mg/kg ,处于缺乏和严重缺乏状态 ;而绝大部分 (88.9%和 88.5 % )耕作土壤有效铜和有效铁的含量较高 ,基本不缺乏。大多数耕作土壤有效锌和有效锰含量较高。有效钼的含量较低 ,46 .8%的耕作土壤有效锰为中低水平。为科学施用微肥提供了重要的参考依据 In view of the agricultural production in Yuxi city due to the lack of trace elements caused by physiological deficiencies of crops, to carry out farming status of trace elements in soil available census. The results showed that the effective boron content of cultivated soils in most of Yuxi City (90.8%) was less than 0.550 mg / kg, which was in a state of lacking and serious lack of cultivation. However, most of the cultivated soils (88.9% and 88.5% And high iron content, the basic lack of. Most tillage soils have high levels of available zinc and available manganese. The content of available molybdenum is low, 46.8% of the effective manganese in cultivated soils is at a low level. For the scientific application of micronutrients provide an important reference