The combination of limited irrigation and high plant density optimizes canopy structure and improves the water use efficiency of cotton
文献类型： 外文期刊
作者： Chen, Zongkui 1 ; Niu, Yuping 1 ; Zhao, Ruihai 1 ; Han, Chunli 1 ; Han, Huanyong 2 ; Luo, Honghai 1 ;
作者机构： 1.Shihezi Univ, Xinjiang Prod & Construct Grp, Key Lab Oasis Ecoagr, Shihezi 832003, Xinjiang, Peoples R China
2.Xinjiang Acad Agr & Reclamat Sci, Cotton Inst, Shihezi 832003, Xinjiang, Peoples R China
关键词： Cotton; Leaf area index; Light interception rate; Canopy apparent photosynthetic rate; Yield
期刊名称：AGRICULTURAL WATER MANAGEMENT （ 2020影响因子：4.516； 五年影响因子：5.12 ）
ISSN： 0378-3774
年卷期： 2019 年 218 卷
收录情况： SCI
摘要： Increasing plant density under insufficiency or deficit irrigation is considered a new water-saving technique in cotton production, especially in Xinjiang, China, an arid area with a short growing period. Increasing plant density reduces light intensity within the canopy; therefore, we hypothesized that resource use efficiency may be the main factor affecting cotton yield and water use efficiency under limited irrigation conditions. To test this hypothesis, 2-year field experiments were conducted to explore the effects of two irrigation patterns (I-500, conventional irrigation; I-425, limited irrigation) and three planting densities (D-12, 12; D-24, 24; D-36, 36 plants m(-2)) on cotton yield, fiber quality, light interception rate, canopy photosynthesis and irrigation water use efficiency (IWUE). I425D36 raised yield and IWUE by 1.40-22.4% and 13.4-34.5%, respectively, but it did not affect fiber quality compared with other treatments. Further, I425D36 increased the leaf area index and the top and middle-canopy light interception rates after 105 days after sowing, which improved the canopy apparent photosynthetic rate. Seed cotton yield was associated with leaf area index and the top- and bottom-canopy light interception rates. We conclude that irrigation of cotton with limited irrigation at a 425-mm level and a plant density at 36 plants m(-2) had significant benefits in terms of economized irrigation without reducing yield in arid areas.
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