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| DOI：10.13522/j.cnki.ggps.20180338 |
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| Efficacy of Different Irrigation Methods in Saving Water and Ameliorating Pollution in Paddy Field: Take Pinghu as an Example |
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XU Yi， WU Yongxiang， WANG Gaoxu， LIU Pei， GUO Ting
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1.Nanjing Hydraulic Research Institute， Nanjing 210029, China; 2.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing 210098, China
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| Abstract: |
| 【Objective】Improving water use efficiency and ameliorating pollution is a challenge facing agriculture and this paper aimed to present an experimental study on efficacy of different irrigation methods in saving water and reducing pollution in paddy field in attempts to provide a suitable management for paddy field in plain regions.【Method】 We examined three irrigation methods: flooding irrigation, shallow-water irrigation and rain-collecting irrigation in Pinghu, Zhejiang province. For each irrigation, we measured TN, TP, NH+4, NH-3 and COD in both irrigation water and drainage water. 【Result】Compared with flooding and shallow-water irrigation, rain-collecting irrigation reduced the amount of irrigation water by 67.4% and 43.4%, TN loss by 86.9% and 90.7%, emission of NH+4 by 96.7% and 98.3% and COD emissions by 61.5% and 62.5% respectively. The difference in change of TP and NH-3 between all three irrigation methods was not significant. 【Conclusion】For the areas we studied, the rain-collecting irrigation is most effective in saving water and reducing pollution. |
| Key words: irrigation; rain-collecting irrigation; ameliorate pollution; paddy field; rice |
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