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Chinese Journal of Applied Ecology ›› 2019, Vol. 30 ›› Issue (12): 4169-4176.doi: 10.13287/j.1001-9332.201912.023

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Responses of cotton canopy structure characteristics to drip irrigation quota in north Xinjiang, China

WANG Xiu-yuan, MA Hui, GAO Hong-yun, LI Nan-nan, LI Jun-hong, XIA Jun, LUO Hong-hai*   

  1. College of Agriculture, Shihezi University/Key Laboratory of Oasis Eco-agriculture of Xinjiang Production and Construction Corps, Shihezi 832003, Xinjiang, China
  • Received:2019-01-16 Online:2019-12-15 Published:2019-12-15
  • Contact: * E-mail: luohonghai@shz.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (31760355, 31560342), the Fok Ying Tung Education Foundation (151030), and Program of Youth Science and Technology Innovation Leader of the Xinjiang Production and Construction Corps (2017CB005)

Abstract: We investigated the effects of different drip irrigation quotas on leaf area index (LAI), diffuse non-interceptance (DIFN), light interception rate (LIR), canopy apparent photosynthetic rate (CAP), and cotton yield of Xinluzao 45 in field of north Xinjiang. There were five drip irrigation treatments, i.e. W1: 600 m3·hm-2, W2: 540 m3·hm-2, W3: 480 m3·hm-2, W4: 420 m3·hm-2, W5: 360 m3·hm-2. The results showed that with the decrease in drip irrigation quota, LAI, LIR and CAP of cotton substantially decreased, with the difference between W1 and W2 being not statistically significant from the full squaring to boll opening stage. Moreover, DIFN was enhanced with the reduction in drip irrigation quota. Highest seed and lint yield (6549 kg·hm-2 and 2677 kg·hm-2, respectively) presented in W1. W2 got a 6.5% reduction of seed cotton yield compared with W1, but the irrigation water use efficiency was enhanced by 3.9%. LAI, LIR and CAP were positively correlated with seed cotton yield from full flowering stage to full boll stage. Therefore, drip irrigation quota at 540 m3·hm-2 could increase irrigation water use efficiency, maintain higher leaf area index, increase diffuse non-interceptance, and ensure light interception rate from full flowering stage to full boll stage, which could enhance canopy apparent photosynthetic rate and water use efficiency without sacrificing yield.