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| DOI：10.13522/j.cnki.ggps.20190288 |
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| Preliminary Research on Rain Storage and Intermittent Irrigation Mode of Jiangxi Province |
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DENG Hailong1,2, XIE Hengwang1,2, LIU Fangping1,2, FU Taoxiu1,2
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1.Jiangxi Irrigating Experimental Central Station, Jiangxi Province Key Laboratory of Agricultural Efficient Water-saving and Non-point Source Pollution Preventing, Nanchang 330201, China; 2.Poyang Lake Water Resources and Water Ecological Environment Research Center of the Ministry of Water Resources, Nanchang 330009, China
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| Abstract: |
| The Rain Storage and Intermittent Irrigation Mode is mainly based on the water control standards of each batch growth period of rice intermittent irrigation mode, which is an irrigation mode that improve the utilization efficiency of rainwater resources through increasing the post-rain water storage depth of rice fields and extending the residence time of the rainwater in the paddy field.【Background】The hydrology and water resources in Jiangxi Province present several characteristics, such as heavy rainfall, low effective utilization of rainfall, and severe water and fertilizer loss. Therefore it is necessary to study and develop a set of water control standards which is conducive to rice growth in Jiangxi Province, and it is of great significance to improve the effective utilization of rainfall and reduce the loss of nitrogen and phosphorus nutrients in the paddy field. Whatmore, it not only can improve the effectiveness of water and fertilizer utilization, but also can achieve the purpose of saving water, increasing yield, and improving efficiency in rice fields.【Objective】The aim of this paper is to explore the effect of water saving and emission reduction in rice rain storage intermittent irrigation mode. 【Method】Taking the double-season early and late rice in Poyang Lake area as the experimental material, the combination of field and pit test was used to study the irrigation quota, drainage quota, effective rainfall utilization rate, yield quota, paddy water productivity, and the productivity and effects of nitrogen and phosphorus emissions, which also analyzed and compared with intermittent irrigation and conventional flood irrigation experiments.【Result】①The volume of irrigation and drainage and the times of irrigation and drainage were significantly reduced compared with flood irrigation mode and intermittent irrigation mode. The average annual irrigation amount of double-crop early and late rice reduced by 975 m3/hm2 and 1 251 m3/hm2 respectively. The annual average irrigation times reduced by 8 times and 7.5 times respectively The annual average displacement reduced by 729 m3/hm2 and 893 m3/hm2, respectively, and the annual average drainage times decreased by 5.8 times and 3.1 times. ②The effective utilization rate of rainfall had been improved significantly. The early rice rainfall utilization rate increased by 12.40% and 9.14%, respectively, and that of the late rice increased by 6.84% and 6.42% respectively. ③The secondary rain storage intermittent irrigation mode can significantly reduce the nitrogen and phosphorus emissions of rice fields, and the annual average total nitrogen emission of double-season rice. The emission reduction is 7.64 kg/hm2 and 3.12 kg/hm2, and the emission reduction is 34.93% and 14.26%. The total phosphorus emission in the double-season early and late rice is 0.180 kg/hm2 and 0.095 kg/hm2, and the emission reduction range is 37.25% and 70.59%.【Conclusion】Rain storage and intermittent irrigation mode has obvious effects on saving water, reducing emissions and improving the effective utilization of rainfall, which can improve the efficiency of rainwater resources, and has a strong space for promotion and application in south rainy areas. |
| Key words: intermittent irrigation of water storage type; intermittent irrigation; water saving; increasing production; nitrogen; phosphorus |
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