Simulation of the effect of farmland drainage conditions on soybean yield in the lower Yangtze River Plain based on DRAINMOD
In order to explore the effect of improving drainage conditions on soybean yield,combined with the results of soybean waterlogging tolerance experiment and considering current high-standard farmland construction requirements,DRAINMOD field hydrological model is used to simulate the effect of farmland waterlogging control and the change law of soybean yield under different drainage conditions.The results show that the DRAINMOD model can accurately predict the dynamics of farmland groundwater table and crop yield in the study area.Improving the farmland surface drain-age has only limited effect on reducing waterlogging and increasing soybean yield.By increasing the intensity of subsurface drainage through tile drainage,the occurrence of farmland waterlogging can be effectively reduced and the yield reduction rate of soybean due to waterlogging can be less than 10％.The optimal layout for tile drainage system to meet the requirements of waterlogging reduc-tionin soybean fields in the study area is 15～20 m spacing and 1.0～1.1 m burial depth.The research results can provide reference for the construction of high-standard farmland drainage sys-tem and soybean high and stable yield in the study area and similar areas.
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