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Abstract

Excessive application of N fertilizers will decrease crop yield, lower N use efficiency and maximize N loss from the soil which leads to increase N2O emission from soil and environmental contamination. The study on biological effects and soil N2O emission under different N fertilizer practices of winter wheat in North China Plain (NCP) would assist to determine the appropriate N fertilizer management for environmental-friendly for winter wheat. Field experiment was carried out using five treatments. The results suggested that 80%RN+CP was an effective and appropriate N fertilizer management practice which increased grain yield, improved N use efficiency, reduced N loss in winter wheat production. The N2O emission fluxes from both seedling stage and greening stage contributed to 51.12%-74.24% of the total N2O emission during the whole winter wheat growth season varied among treatments. Cumulative N2O emission during winter wheat season was declined significantly by 27.27% and 43.43%, and emission factor was reduced by 8.89% and 51.11% in 80%RN and 80%RN+CP treatments, respectively, comparing with FN. Consequently, the use of CP with 20% reduction of N fertilizer rate for winter wheat production should be recommended in order to increase economic yield and mitigate environmental pollution.

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