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 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.
其中农业技术又包含对农作物、农具、耕作和栽培技术、农田水利技术等的考察。
The agricultural technology refers to the study of crops, farm tools, tillage and cultivation technology, farmland's irrigation technology.
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