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| Drip irrigation schedules of maize in Tongliao |
| JIA Qiong1, SHI Haibin1*, LI Ruiping1, FENG Yayang1, LI He2, ZHENG Jiawei3 |
| 1.Water Conservancy and Civil Engineering College, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010018, China; 2.Tongliao water conservancy technology promotion station, Tongliao, Inner Mongolia 028000, China; 3.Inner Mongolia Water Conservancy Department, Inner Mongolia, Hohhot, Inner Mongolia 010018, China |
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Abstract A field experiment on drip irrigation schedule of maize was conducted in Tongliao, Inner Mongolia in 2016 in order to produce a more reasonable schedule for the maize in the background of "Water Saving and Grain Increasing Action" in China. A rainfall frequency analysis was made by using rainfall data of the experimental field in previous 34 years. By choosing meteorological data in typical years and combining with actual evapotranspiration rules obtained from the drip irrigation field experiment, six kinds of irrigation treatment were compared with each other in each growth stage. The maize plant height, leaf area index, productivity, etc. were measured. The results show that the characteristics and yield of maize in medium irrigation treatment are better than the others, and water use efficiency(WUE)was the highest, suggesting the best irrigation treatment. The medium irrigation treatment is used as the reference for drip irrigation schedule, then the reference evapotranspiration(ET0)is calculated based on the meteorological data. The actual water consumption is used to obtain the crop coefficient of each growth stage, and then the water requirement is calculated based on the ET0 of a typical year. According to the rainfall data, the drip irrigation schedules for different hydrological years are worked out, respectively. The film-covered drip irrigation quota is 1 575 m3/hm2, the non-film drip irrigation quota is 1 785 m3/hm2 in low flow year. The drip irrigation quotas with and without film cover in normal flow year are 1 125 m3/hm2 and 1 425 m3/hm2, respectively. Meanwhile, in flow year, the drip irrigation quotas with and without film cover are 600 m3/hm2 and 900 m3/hm2, respectively.
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Received: 27 April 2018
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