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
NETL
NSTL
万方数据
