| Study on cotton drip irrigation under film mulching in southern Xinjiang based on meteorological information |
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| DOI：10.7606/j.issn.1000-7601.2019.03.10 |
| Key Words: drip irrigation under mulch cotton evapotranspiration (ETc) meteorological information irrigation strategy water use efficiency |
| Author Name | Affiliation | | FAN Kai | Farmland Irrigation Research Institute, Chinese Academy of Agricultural Science/Ministry of Agriculture Key Laboratory of Crop Water Requirement and Regulation, Xinxiang, Henan 453003, China
Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China | | GAO Yang | Farmland Irrigation Research Institute, Chinese Academy of Agricultural Science/Ministry of Agriculture Key Laboratory of Crop Water Requirement and Regulation, Xinxiang, Henan 453003, China | | WANG Xing-peng | College of Water Conservancy and Architectural Engineering of Tarim University, Alaer, Xinjiang 843300, China | | WANG Hong-bo | College of Water Conservancy and Architectural Engineering of Tarim University, Alaer, Xinjiang 843300, China | | DUAN Ai-wang | Farmland Irrigation Research Institute, Chinese Academy of Agricultural Science/Ministry of Agriculture Key Laboratory of Crop Water Requirement and Regulation, Xinxiang, Henan 453003, China |
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| Abstract: |
| In order to explore the feasibility of guiding cotton drip irrigation under mulch according to meteorological information in southern Xinjiang, a field experiment was conducted in Alar, southern Xinjiang. The irrigation was carried out when the difference between evapotranspiration and precipitation reached 30 mm. The evapotranspiration of crops (ETc) was calculated from weather data collected by automatic meteorological station. There were four treatments including three irrigation quotas (T1:24 mm, T2:30 mm, and T3:36 mm) and a conventional irrigation treatment (T4), which was considered as a control. Each treatment was triplicated. During the experiment, the dynamic changes in soil moisture, physiological indexes of plant, yield of seed-cotton and lint-cotton, irrigation water use efficiency, and field water use efficiency were monitored and analyzed. The results showed that the water consumption of the treatments guiding irrigation by meteorological information was between 361.8~435.2 mm, it was noticed that the greater irrigation quota was, the more water consumption during the whole growth period was. However, it was significantly lower than the total water consumption of 522.1 mm under conventional irrigation. Furthermore, unginned cotton yield was positively correlated with irrigation quota. There was no significant difference in unginned cotton yield between T3 treatment (7 072.05 kg·hm-2) and T4 control treatment (7 245.28 kg·hm-2). The irrigation water use efficiency decreased with increasing irrigation quota but was significantly higher than that of the control treatment. Taking in account the yield and water use efficiency of different irrigation treatments, it is concluded that when the difference of evapotranspiration and precipitation was 30 mm, 36 mm irrigation quota can significantly improve the irrigation water use efficiency and field water use efficiency without impacting cotton yield, which is suitable for southern Xinjiang. |
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