Drainage and Total Nitrogen Loss of Cropland under Drip Irrigation and Subsurface Pipe Drainage

Abstract Water saving irrigation as an effective measure to improve the utilization rate of water resources and alleviate water deficit has been widely practiced in arid and semi-arid regions. In this study, an integrated drip irrigation and subsurface pipe drainage system was developed to study the total nitrogen emission concentration of sunflowers during the whole growth period. The test and results show that total nitrogen concentration of farmland drainage in the spring irrigation period exceeded the standard V of “Surface Water Quality Standard”. In addition, prolonging the leaching time or reducing the irrigation quota can effectively reduce the concentration of total nitrogen in farmland drainage.