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| Effects of irrigation timing and water temperature on cotton growth and yield under mulched drip irrigation |
| WANG Zhenhua1,2,3*,WU Xiaodi1,2,3, WANG Tianyu1,2,3, ZONG Rui1,2,3, WANG Dongwang1,2,3, CHEN Rui1,2,3 |
| 1. College of Water Resources and Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832000, China; 2. Key Laboratory of Modern WaterSymbolm@@Saving Irrigation of Xinjiang Production Symbolf@@ Construction Corp, Shihezi, Xinjiang 832000, China; 3. Key Laboratory of Northwest Oasis Water-Saving Agriculture, Ministry of Agriculture and Rural Affairs, Shihezi, Xinjiang 832000, China |
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Abstract In order to explore the effects of different irrigation timing and water temperature on the physiological characteristics and yield of cotton under mulched drip irrigation, four irrigation water temperature levels were set as 15(normal irrigation water temperature), 20, 25, and 30 ℃, and two irrigation timing levels were daytime and nighttime(denoted as DW and NW, respectively)for a complete combined design, with a total of eight treatments. The results showed that warming irrigation advanced the growth process of cotton, promoted the growth of plant height, stem diameter and leaf area of cotton, and was conducive to the photosynthesis of cotton, and the effect of warming irrigation at night was more significant. Warming irrigation significantly increased seed cotton yield by 2.95%Symbolm@@14.13%, and nighttime irrigation increased cotton yield by 3.34% compared with daytime irrigation. Based on regression analysis, it was determined that the best irrigation time to increase cotton yield was at night, the best irrigation water temperature was 26.38 ℃, and the corresponding yield was 7 482.96 kg/hm2. The results could provide theoretical basis and technical reference for the implementation of warming irrigation technology for drip irrigation cotton under film in northern Xinjiang.
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Received: 10 June 2021
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