Optimizing irrigation for photosynthesis and drought resistance of extra- long staple cotton varieties

• Published in: Guanʻgai paishui xuebao Vol. 44; no. 3; pp. 22 - 31
• Main Authors: NING Liyun, ZHANG Jusong, WANG Li, WU Yifan, HU Haoran, ZHANG Chengjie
• Format: Journal Article
• Language: Chinese
• Published: Science Press 01.03.2025
• Subjects: sea island cotton; irrigation quotas; variety; photosynthetic properties; evaluation of drought resistance
• ISSN: 1672-3317
• DOI: 10.13522/j.cnki.ggps.2024232

【Objective】 Cotton is a vital cash crop in Xinjiang, but its production depends heavily on irrigation due to water scarcity in the region. This study experimentally evaluated the drought resistance of major extra-long staple (ELS) cotton (Gossypium barbadense) varieties throughout their entire growth period. 【Method】The field experiment used a two-factor split-zone design to assess the effects of three irrigation levels: W1 (3 150 m3/hm2, 70% of conventional irrigation), W2 (3 825 m3/hm2, 85% of conventional irrigation), and W3 (4 500 m3/hm2, conventional irrigation). Photosynthesis and yield responses were analyzed across different cotton varieties. The drought resistance coefficient for each variety was determined using principal component analysis, evaluating the contribution of various factors to the drought index. The comprehensive drought resistance evaluation value (D) was used to classify and assess the drought tolerance of different varieties.【Result】Both irrigation level and cotton variety significa