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| Comprehensive assessment of the agronomic and environmental effects of N application rate reduction combined with nitrification inhibitor on Chinese cabbage |
| Received:July 29, 2020 |
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| KeyWord:nitrogen fertilizer;nitrification inhibitor;nitrogen footprint;carbon footprint;net ecosystem economic benefit |
| Author Name | Affiliation | E-mail | | GUO Guang-zheng | Chongqing Key Laboratory of Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Southwest University, Chongqing 400715, China | | | ZHANG Fen | Chongqing Key Laboratory of Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Southwest University, Chongqing 400715, China | | | SHEN Yuan-peng | Chongqing Key Laboratory of Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Southwest University, Chongqing 400715, China | | | XIAO Yan-bo | School of Ethnic Medicine, Yunnan Minzu University, Kunming 650500, China | | | ZHU Pan | EuroChem Agro Trading(Shenzhen) Co., Ltd, Shenzhen 518000, China | | | WANG Fang | Chongqing Key Laboratory of Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Southwest University, Chongqing 400715, China | | | CHEN Xin-ping | Chongqing Key Laboratory of Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Southwest University, Chongqing 400715, China | | | WANG Xiao-zhong | Chongqing Key Laboratory of Efficient Utilization of Soil and Fertilizer Resources, College of Resources and Environment, Southwest University, Chongqing 400715, China | wxz20181707@swu.edu.cn |
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| Abstract: |
| In order to optimize N management and achieve green vegetable production. This study conducted a two-year field experiment with life cycle assessment(LCA)method to evaluate the comprehensive effects of different N managements on total yield, N use efficiency, economic benefit, net ecosystem economic benefit(NEEB), and N and C footprint of open-field Chinese cabbage production in southwest China. The N management treatments included the control(without N fertilizer, CK), conventional fertilization(FP), and N reduction with nitrification inhibitors(OPT1 and OPT2). The results showed that compared with FP, the total yield and commercial yield in OPT1 and OPT2 treatments were higher by 6.7% and 4.2%, and 16.4% and 9.0%, respectively; the N use efficiency of OPT1 and OPT2 treatment was also higher by 9.6% and 11.2%, respectively. Meanwhile, OPT1 and OPT2 reduced the reactive N(Nr)loss by 75.0% and greenhouse gas (GHG)emission by 68.0%, respectively. Therefore, the N and C footprints of OPT1 and OPT2 were lower by 76.4% and 76.1%, and 69.9% and 69.4%, respectively. In addition, relative to FP treatment, OPT1 and OPT2 significantly increased the net ecosystem economic benefit(NEEB)by 106.0% and 97.9%, respectively, and decreased significantly the GHG-NEEB and Nr-NEEB. In conclusion, N fertilizer reduction combined with nitrification inhibitor management increased the vegetable yield, reduced the N fertilizer rate and environmental cost, and improved the NEEB; it was an effective measure to realize green vegetable production. |
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