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| Development and application of intermittent irrigation system in rice growth period |
| DENG Hailong*, XIE Hengwang, FU Taoxiu, WANG Zirong |
| Jiangxi Irrigating Experimental Central Station, Jiangxi Province Key Laboratory of Agricultural Efficient Water-saving and Non-point Source Pollution Preventing, Nanchang, Jiangxi 330201, China |
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Abstract The successful research and development of an intelligent irrigation system for rice growing period by combining mathematical statistics, mechanical engineering and information control technology was introduced. After field tests and trials, the comparison and analysis of automatic mea-surement data and manual measurement data proved that the measurement accuracy of water volume and water level met the requirements. Based on the experimental data of rice irrigation, it was observed that compared with intermittent irrigation, the amount, frequency as well as time of irrigation and drainage of the intelligent irrigation during the rice growth period were significantly reduced. In terms of irrigation volume: the intelligent intermittent irrigation mode reduces the water demand by 51.60-208.90 mm compared with the intermittent irrigation mode, the reduction range achieves 24.0%-30.40%, and the irrigation frequency reduces by 1.5 terms of the effective utilization rate of rainfall: the rainfall utilization rate of the intelligent intermittent irrigation mode increases by 7% compared with the intermittent irrigation mode; in terms of drainage, the field drainage under the intelligent intermittent irrigation mode is lower than the intermittent irrigation mode by 18.39 mm, and the reduction rate achieves 17.9%. The yields of early rice and late rice showe that the intelligent intermittent irrigation mode is greater than the intermittent irrigation mode, which respectively increases by 4.2% and 8.9%. The application of the intelligent irrigation system in the rice growth period had obvious effects on water saving, emission reduction and improvement in the effective utilization rate of rainfall, which had great significance to improving the scientific and technological level of crop water demand research and measurement in the country.
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Received: 16 May 2022
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