This thesis is one sub-project of the task named 揟he Agricultural Synthetically Development Study on Low-wet Land of Sanjiang Plain?which belongs to 搕he NinthFive Years Plan of China? Three different genotype soybeans under two treatments, which ridge-height were 40 cm and 30 cm, were adopted in this experiment, and the control was ridge farming. The object of this study was to investigate the effect of the dynamics of soil ecological environment on soybean root growth, the change of leaf area ...