The main reason for this succession might be the changes in crops distribution, cultivation type, planting method, management technique and over-use of chemical pesticides and fertilizers.
导致这一演替的主要原因为作物布局、耕作制度、栽培方法、管理技术的变化和农药化肥的过量施用。
The fate of nitrogen fertilizer in current crop and succession crops in winter wheat and summer maize rotation system were studied using field 15n micro-plot.
采用田间微区1 5n示踪试验研究了肥料氮在冬小麦、夏玉米当季和后茬的去向。
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