Arid Zone Research ›› 2021, Vol. 38 ›› Issue (2): 570-579.doi: 10.13866/j.azr.2021.02.29

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Effect of film mulching residue on cotton growth in drip irrigation cotton field

ZHU Jinru1,2(),LI Wenhao1,2(),WANG Zhenhua1,2,ZONG Rui1,2,WANG Tianyu1,2   

  1. 1. College of Water Resources and Architectural Engineering, Shihezi University, Shihezi 832000, Xinjiang, China
    2. Key Laboratory of Modern Water-Saving Irrigation of Xinjiang Production and Construction Corps, Shihezi University, Shihezi 832000, Xinjiang, China
  • Received:2020-05-06 Revised:2020-12-01 Online:2021-03-15 Published:2021-04-25
  • Contact: Wenhao LI E-mail:zhujinru2018@163.com;lwh8510012@163.com

Abstract:

To clarify the influence of film residue on cotton growth in a field with film mulching under drip irrigation, we assessed the characteristics of residual film accumulation in an oasis drip irrigation cotton field. The design corresponds to 5 a, 10 a, 15 a, 20 a, 25 a, 30 a; a gradient of six residual film accumulations using a barrel-planting experiment. We analyzed the influence of residual film accumulation in cotton fields with different mulching years on cotton growth and yield. The residual film significantly affected cotton plant height and leaf area, which gradually decreased as the residual film amount increased. The plant height and leaf area were significantly reduced at each stage when the film was covered with drip irrigation for 20 years. Additionally, increases in the amount of residual film in drip irrigation for 20 years significantly reduced the cotton root index. Compared with the control treatment without residual film, the root length density in drip irrigation 20 a was reduced by 8.2%, the root surface area density was reduced by 10%, the root volume was reduced by 7.2%, and the root diameter decreased by 19.4%. The amount of residual film was significantly negatively correlated with cotton dry matter accumulation and yield. After 15 years of drip irrigation with film mulching, the cotton yield was lower than the average yield per unit area in Xinjiang in the past five years. After 20 years of drip irrigation with film mulching, the above-ground dry matter quality decreased by 20.3%, the root dry matter quality was reduced by 38.4%, and the output was 10.96% lower than the average output per unit area in Xinjiang in the past five years. In summary, increased amounts of residual film significantly impact the normal growth of cotton. When drip irrigation with film mulching continues for 15-20 years, yield, growth, and root indices of cotton are significantly reduced. The research results can provide a theoretical basis for the sustainable development of drip irrigation cotton fields in Xinjiang.

Key words: mulch drip irrigation, residual film, cotton, root system, yield