| Cite this article: | 王矿,曹秀清,高振陆,等.深蓄控排条件下稻田氮素变化规律研究[J].灌溉排水学报,0,():-. |
| WANG Kuang,CAO Xiuqing,GAO Zhenlu,et al.深蓄控排条件下稻田氮素变化规律研究[J].灌溉排水学报,0,():-. |
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| Study on the variation law of nitrogen in paddy field under deep storage and controlled discharge |
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WANG Kuang, CAO Xiuqing, GAO Zhenlu, JIANG Shangming, YANG Jiwei, WANG Yefan
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Anhui and Huaihe River Institute of Hydraulic Research
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| Abstract: |
| 【Objective】In order to clarify the occurrence regularity of soil water nitrogen under different water management modes, a plot experiment was carried out at Feidong Irrigation Experimental Station. 【Method】The experiment of controlled deep storage and drainage under natural rainfall was carried out in Feidong Irrigation Experimental Station. The nitrogen status of soil water and paddy drainage at different depths was observed, and the irrigation amount, drainage amount and rice yield factors under different water management modes were discussed and analyzed. The changes of NH4+-N, NO3--N and TN concentrations in paddy soil water under conventional flooding irrigation CK treatment, dry-wet alternate irrigation L1 treatment and deep storage and controlled drainage L2 and L3 treatment were monitored.【Result】 Compared L1, L2 and L3 treatment with CK treatment,the irrigation water of rice was reduced by 725 m3 . hm-2, 1703 m3 . hm-2 and 2304 m3 . hm-2, and the rainwater utilization rate was increased by 11.8 %, 19.0 % and 25.9 %,The number of paddy drainage was reduced by 1-3 times. NH4+-N, NO3--N and TN changed regularly, and the nitrogen concentration in each treatment decreased with the increase of depth. The TN peak values of deep storage and controlled discharge L2 and L3 treatments were lower than those of CK treatment in the control group. L1, L2, L3 treatment compared with CK treatment, TN pollution load reduction was 21.3 %, 26.7 %, 31.5 %, and there was no significant difference in yield among treatments. 【Conclusion】By increasing the upper limit of rainfall storage and extending the interval days, the deep storage and drainage control technology can effectively reduce the irrigation quota, reduce the paddy field drainage, improve the utilization rate of rainwater, and achieve the purposes of water saving, emission reduction, pollution control and stable yield of rice. The water management mode of deep storage control and drainage of paddy field provides reference for the control of agricultural non-point source pollution, and it is in favor of the efficient utilization of regional water and fertilizer. |
| Key words: rice; irrigation and drainage mode; experimental study; ammonium nitrogen;nitrate nitrogen |
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