| The formulation of drip irrigation system for corn in Yanghuang pumping irrigation area of Yanchi County |
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| DOI：10.7606/j.issn.1000-7601.2019.05.04 |
| Key Words: maize drip irrigation system soil moisture content water use efficiency Yanghuang pumping irrigation area |
| Author Name | Affiliation | | WANG Wen | Ningxia Hydraulic Research Institute，Yinchuan, Ningxia 750021, China | | Zhai Ru-wei | Ningxia Hydraulic Research Institute，Yinchuan, Ningxia 750021, China | | Liu Ping | Ningxia Hydraulic Research Institute，Yinchuan, Ningxia 750021, China | | Liu Xue-jun | Ningxia Hydraulic Research Institute，Yinchuan, Ningxia 750021, China | | Bao Zi-yun | Ningxia Hydraulic Research Institute，Yinchuan, Ningxia 750021, China |
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| Abstract: |
| In order to improve the water use efficiency in Ningxia Yellow River irrigation area and promote the application of drip irrigation technology in corn production, a study on corn drip irrigation system was carried out in the Yanghuang pumping irrigation area of Yanchi County, Ningxia. The experiment included 9 gradient irrigation treatments of 2 131~3 847 m3·hm-2 with single factor fertilization level, the number of irrigation was 10 times, and the irrigation quota was 150~450 m3·hm-2. Through monitoring the amount of water, soil moisture content, maize yield, and the changes of soil water content during the growth period of maize, the water consumption intensity at each growth stage, the soil water storage under different irrigation quotas and the annual irrigation amount were analyzed. The results showed that there was a significant difference in soil moisture content between 0~40 cm before and after irrigation, and there was no difference in 40~100 cm layer. There was significant water storage when the irrigation quota was 225~375 m3·hm-2; at 450 m3·hm-2, the irrigation water had deep and side leakage. The irrigation amount was positively correlated with grain and silage yield with R2 values of 0.75 and 0.82, respectively, and at 3 402, 3 628 and 3 847 m3·hm-2, the yield was 14 062, 11 717 and 12 889 kg·hm-2. The grain and silage yields decreased with increasing irrigation amount. The irrigation water production efficiency was 2.46, 2.01 and 2.14 kg·m-3, respectively. The filling period, the tasseling stage, and the jointing stage were key corn growth stages that required a water demand of 300~375 m3·hm-2. The optimum number of drip irrigation in Yanghuang pumping irrigation area of Yanchi County should be 10~11 times and the irrigation quota should be 3 405~3 660 m3·hm-2. |
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