1/25/2024 0 Comments Download Hydrus Network 546 free![]() ![]() The NH4‒N and NO3‒N losses in the outflow of the improved subsurface drainage increased significantly 0.5 days after the rain began. Under conditions of homogeneous soil and nitrogen content distribution, when rainfall occurred on the first, second, and third days, the total ammonia nitrogen (NH4‒N) and nitrate nitrogen (NO3‒N) losses under a rainfall of 141 mm are approximately 1.26, 1.31, 1.39 and 1.2, 1.25, 1.36 times that under a rainfall of 44 mm, respectively. The results indicate that HYDRUS performed well for the simulation. In this study, nitrogen loss in outflow and soil nitrogen content under improved subsurface drainage for one-time drainage is evaluated based on a calibrated HYDRUS model, considering the precipitation process, initial groundwater table depth, initial soil nitrogen content, submerged pipe height, drain spacing, drain depth, filter width, and filter height during a 3-day individual drainage. However, the environmental effects of improved subsurface drainage with different parameters have rarely been studied. ![]() Improved subsurface drainage has been verified as a more efficient drainage technique for solving problems of farmland shortage and frequent floods in South China. ![]()
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