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| DOI：10.13522/j.cnki.ggps.2022409 |
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| Improveing Irrigation and Fertilization to Reduce Water Usage and Nitrogen Pollution from Rice Fields in Southern China |
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XIAO Xin, ZOU Zhike, CHEN Yanfei, LUO Wenbing, LI Yalong,
YANG Zirong, ZOU Chuanlin, DENG Hailong, FU Taoxiu
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1. Yangtze University, Wuhan 430100, China; 2. Yangtze River Scientific Research Institute, Wuhan 430010, China;
3. Guilin University of Technology, Guilin 541006, China; 4. Jiangxi Center Station of Irrigation Experiment, Nanchang 330201, China
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| Abstract: |
| 【Objective】Agriculture is responsible for 8.5% of greenhouse gasses emitted to the atmosphere. Improving agricultural management and reducing gas emissions from soils is hence important in the fight against global warming. In this paper, we investigate the effect of different irrigation and fertigation on reducing nitrogen losses from rice fields in Poyang Lake Basin in southern China.【Method】The field experiment was conducted at the Ganfu Plain Irrigation Area located at the Irrigation Experiment Center Station of Jiangxi Province. It consisted of an intermittent irrigation (W1) and a flooding irrigation (W0), each irrigation treatment had three nitrogen fertilizations: no fertilization (N0), fertilizing 135 kg/hm2 (N1), and 180 kg/hm2 of nitrogen (N2). Rice growth, its associated water use efficiency, and nitrogen emissions from each treatment were measured during the experiment.【Result】Irrigation impacted water consumption and leakage. Compared with W0, W1 reduced irrigation water usage by 18.12%~28.37%, water leakage by 13.68% to 22.85%, and saved water by 28.77%. Depending on nitrogen application, W1 treatments increased the average yield by 16.57% to 29.94% and reduced average nitrogen emissions by16.42%, compared to the W0 treatments. Increasing nitrogen fertilization led to an increase in nitrogen emission when the irrigation was the same; fertilization had a significant effect on ammonia volatilization. Irrigation-fertilization did not show a significant interactive impact on ammonia volatilization.【Conclusion】The optimal irrigation and fertilization for rice production in Poyang Lake Basin was intermittent irrigation coupled with fertilizing 135 kg/hm2 of N. Compared to W0+N2 – flooding irrigation with 180 kg/hm2 of nitrogen fertilization, the optimal irrigation and fertigation can increase rice yield by 9.82%, reduce irrigation amount, nitrogen pollution and nitrogen emissions by 27.54%, 25.67% and 11.90%, respectively. |
| Key words: water saving and emission reduction; water and fertilizer interaction; ammonia volatilization; paddy field; irrigation mode |
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