Optimizing irrigation strategies to improve the soil microenvironment and enhance cotton water productivity under deep drip irrigation

文献类型： 外文期刊

第一作者： Li, Nannan

作者： Li, Nannan;Shi, Xiaojuan;Zhang, Humei;Shi, Feng;Zhang, Hongxia;Liang, Qi;Luo, Honghai;Hao, Xianzhe;Wang, Jun

作者机构：

关键词： Deep drip irrigation; Irrigation strategy; Soil microenvironment; Water use efficiency; Biomass

期刊名称：AGRICULTURAL WATER MANAGEMENT （ 影响因子：6.5； 五年影响因子：6.9 ）

ISSN： 0378-3774

年卷期： 2024 年 305 卷

页码：

收录情况： SCI

摘要： Subsurface drip irrigation in arid areas has the potential to replace traditional mulched drip irrigation to achieve green and sustainable cotton production. However, the suitable irrigation amount and frequency are still unclear, which seriously limits the ability of this model to improve water productivity and water-saving potential. Therefore, a field experiment was carried out from 2021 to 2023; a split plot experimental design was adopted with two irrigation amounts (W1, 3177 m(3) ha(-1); W2, 3840 m(3) ha(-1)) and three irrigation frequencies (F1, 9; F2, 8; F3, 7). The effects of different irrigation strategies on the soil microenvironment, moisture content, biomass, and water use efficiency (WUE) of cotton organs were evaluated. The W2 treatment improved the soil moisture content, increased the soil temperature gradient, and reduced the soil conductivity, thereby increasing the moisture content and biomass of various organs. Moreover, compared with the F1 treatment, the F2 and F3 treatments were more likely to increase the soil moisture content, soil temperature gradient, WUEStem, WUELeaf and WUEBoll. In addition, the water consumption of the F2 and F3 treatments decreased by 3.9% and 0.9%, respectively, compared with that of the F1 treatment. These findings indicate that W2F2 can reduce water consumption while increasing boll biomass and WUEBoll. Further analysis revealed that under W2F2, WUEBoll was positively correlated with soil temperature gradient and soil conductivity and negatively correlated with leaf moisture content (LMC) and water consumption. In summary, with an irrigation amount of 3840 m(3) ha(-1), delaying the initial irrigation event and increasing the irrigation quota (8 irrigation events) improve the water environment in cotton fields, reducing soil temperature fluctuations and surface salt accumulation and synergistically increasing the boll biomass of cotton organs and WUEBoll. This irrigation strategy represents an effective cotton cultivation method to maximize cotton yield and improve resource utilization efficiency.

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