Characteristics and Control of Nitrogen and Phosphorus Loss in Open Vegetable Fields in Moist Southern Plains
To explore the characteristics of nitrogen and phosphorus loss in open vegetable fields in moist southern plains and the effectiveness of their control,three treatments were set up:conventional fertilization(CK),optimized fertilization(KF),and optimized fertilization combined with plastic film mulching(BMP).Positioned observations were conducted from 2015 to 2022.The results show that nitrogen in runoff is mainly nitrate nitrogen,accounting for 85.22%-86.10%.The total nitrogen content increases first and then decreases with the increase in planting years for all treatments.KF and BMP treatments significantly reduce total nitrogen content in runoff by 14.29%and 21.43%,respectively.Soluble phosphorus is the main form of phosphorus in runoff,accounting for 76.87%-79.16%.The total phosphorus content in runoff shows an increasing trend year by year,and KF and BMP treatments can significantly reduce it by 26.78%and 29.10%.Even with optimized fertilization and plastic film mulching,nitrogen and phosphorus content in runoff still exceeds the Class V standard limit for surface water,indicating that the risks still need to be addressed.
plastic film mulchingoptimized fertilizationopen vegetable fieldnitrogen and phosphorus loss
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万方数据
