1986年,对全盟主要耕种土壤类型的各种有效态微量元素,进行了较系统的化验测定,结果表明:锌、锰、钼、硼的有效态含量低于全国临界值之下的土壤面积占70～90％;铜、铁有效态含量也属中等水平,低于全国临界值之下的土壤面积仍占30～50％。为此,1990至1991年,由盟土站主 In 1986, all kinds of effective trace elements in cultivated soils of the League were systematically tested. The results showed that the effective contents of zinc, manganese, molybdenum and boron were lower than the soil area under the national critical value Accounting for 70-90%; the effective content of copper and iron is also medium level, and the soil area below the national critical value still accounts for 30-50%. To this end, from 1990 to 1991, by the alliance owners