Innovative nitrogen management strategy reduced N2O emission while maintaining high pepper yield in subtropical condition

文献类型： 外文期刊

第一作者： Zhang, Fen

作者： Zhang, Fen;Ma, Xiao;Cao, Hailing;Liu, Fabo;Wang, Junjie;Guo, Guangzheng;Liang, Tao;Chen, Xinping;Wang, Xiaozhong;Zhang, Fen;Ma, Xiao;Wang, Junjie;Chen, Xinping;Wang, Xiaozhong;Ma, Xiao;Ma, Xiao;Gao, Xiaopeng;Guo, Guangzheng;Liang, Tao;Wang, Yan;Chen, Xinping;Wang, Xiaozhong

作者机构：

关键词： Emission factor; Enhanced efficiency fertilizer; Nitrogen rate; Nitrous oxide; Vegetable; Yield

期刊名称：AGRICULTURE ECOSYSTEMS & ENVIRONMENT （ 影响因子：6.6； 五年影响因子：6.7 ）

ISSN： 0167-8809

年卷期： 2023 年 354 卷

页码：

收录情况： SCI

摘要： High N fertilizer inputs in subtropical vegetable systems under the warm and humid climatic conditions increase the risk of nitrous oxide (N2O) emissions. However, there is limited information available on integrated N management strategies to reduce N2O emissions from intensive open-field vegetable systems in subtropical region. Two plot-based field experiments were conducted in subtropical southwest China to examine the effects of different N management strategies on N2O emissions from a typical open-field pepper (Capsicum annuum L.) production system. Experiment 1 included five N rates (0, 175, 250, 325, and 400 kg ha-1) with conventional urea. Experiment 2 included a 0 N control and four N sources (conventional urea, organic fertilizer, nitrification inhibitor-based enhanced efficiency fertilizer ENTEC26, and controlled release urea) applied under an optimized N rate (250 kg N ha-1). The results of Experiment 1 showed that cumulative N2O emission and emission factor were 4.05 kg N ha-1 season- 1 and 0.96%, respectively, under the conventional management (N400). N2O emissions increased exponentially with increasing N rates. Compared to the N400 treatment, application of conventional urea at the optimal rate (250 kg N ha-1) significantly reduced cumulative N2O emissions by 54% while maintaining similar pepper yield. The results from Experiment 2 indicated that the use of enhanced efficiency fertilizers at the optimal rate further reduced N2O emission by 30%- 50% compared to conventional urea, while increasing pepper yield by 6.7%- 9.0%. This resulted in a 36%- 53% reduction of yield-scaled N2O emission intensity. In particular, the use of nitrification inhibitor was 28% more effective than controlled release urea for N2O mitigation. These results suggest that the application of enhanced efficiency fertilizers at an optimum N rate could produce more vegetables while reducing N2O emission, thereby promoting sustainable vegetable production in the subtropic regions.

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