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2008年对耕层土壤中微量元素进行养分调查,结果表明耕层土壤有效锰、有效铜、有效锌、有效硼含量与1993年土壤养分调查结果比较均有不同程度的增加,有效铁、有效硫呈下降趋势。化肥施用结构不合理、硫肥投入不足是造成耕层土壤有效硫下降的主要原因。
In 2008, the nutrient contents of trace elements in topsoil were investigated. The results showed that available manganese, available copper, available zinc and available boron in topsoil increased with different degrees compared with the results of soil nutrient survey in 1993. The contents of available iron, available sulfur Showing a downward trend. The unreasonable structure of fertilizer application and the insufficient input of sulfur fertilizer are the main reasons for the decrease of available sulfur in topsoil.