title: [Nitrogen balance and environmental impact of paddy field under different N management methods in Taihu Lake region].
abstract: Effects of nitrogen (N) management methods of paddy field on N export to environment and paddy N balance in Taihu lake region, China were studied. Field experiment including site-specific nitrogen management (SSNM), organic & chemical N fertilizer treatment (OCN), control released urea treatment (CRN), reduced chemical N treatment (RN) and farmer's N treatment (FN) were conducted at the Taihu lake region in 2008. N loss including runoff, leaching, ammonia volatilization and N2O were calculated, and the N balance was evaluated. Results showed the grain yield of SSNM, OCN, CRN and RN treatments was identical with FN treatment, while the total N rate reduced about 20%-40%, and N use efficiency (NUE) increased 14.5%-44%. N export of SSNM and CRN treatments decreased 52.8% and 45.4% in comparison with FN treatment. Under the same N input, N export of OCN treatment was lower than pure chemical N treatment (RN). N surplus was observed in FN treatment, while N deficit existed in SSNM treatments. CRN and SSNM treatments could increase NUE, reduce N export without sacrifice of yield and benefit, and could be as an economic and environment-friendly measure to intensify in Taihu lake region.
authors: Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China. lhxue@issas.ac.cn
authors: Li-Hong
authors: LH
authors: Xue
authors: Ying-Liang
authors: YL
authors: Yu
authors: Lin-Zhang
authors: LZ
authors: Yang
mesh_terms: D000383:Agriculture / Q000379:methods; D002681:China; D004784:Environmental Monitoring; D005308:Fertilizers; D009584:Nitrogen / Q000032:analysis* / Q000737:chemistry; D012275:Oryza / Q000254:growth & development*; D012989:Soil Pollutants / Q000032:analysis*
chemical_list: D005308:Fertilizers; D012989:Soil Pollutants; D009584:Nitrogen