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Optimizing cotton yield through appropriate irrigation water salinity: Coordinating above- and below-ground growth and enhancing photosynthetic capacity

文献类型： 外文期刊

作者： Ma, Zhanli 1 ; Liu, Jian 1 ; Wen, Yue 1 ; Zhang, Jinzhu 1 ; Yin, Feihu 4 ; Guo, Li 5 ; Li, Wenhao 1 ; He, Jing 1 ; Ma, Jiaying 1 ; Liang, Yonghui 1 ; Wang, Zhenhua 1 ;

作者机构： 1.Shihezi Univ, Coll Water Conservancy & Architectural Engn, Shihezi 832000, Xinjiang, Peoples R China

2.Shihezi Univ, Key Lab Modern Water Saving Irrigat, Xinjiang Prod & Construct Grp, Shihezi 832000, Xinjiang, Peoples R China

3.Minist Agr & Rural Affairs, Key Lab Northwest Oasis Water Saving Agr, Shihezi, Peoples R China

4.Xinjiang Acad Agr & Reclamat Sci, Shihezi 832000, Peoples R China

5.Sichuan Univ, Coll Water Resource & Hydropower, State Key Lab Hydraul & Mt River Engn, Chengdu 610065, Peoples R China

关键词： Irrigation water salinity; Cotton productivity; Coordinated growth; Photosynthetic capacity; Mulched drip irrigation

期刊名称：EUROPEAN JOURNAL OF AGRONOMY （ 影响因子：5.2； 五年影响因子：5.9 ）

ISSN： 1161-0301

年卷期： 2024 年 154 卷

页码：

收录情况： SCI

摘要： The employment of brackish water for irrigation holds considerable potential for addressing the shortfall of freshwater resources in arid regions. It is crucial to discern the impact of salinity on agricultural output and its mechanisms when irrigating with brackish water. Here, a two-year field experiment (2021-2022) was undertaken in Xinjiang, China to assess the effects of water salinity (0.85 g L-1, CK; 3 g L-1, S1; 5 g L-1, S2; and 8 g L-1, S3) on the growth, photosynthesis, carbon accumulation, and cotton yield under mulched drip irrigation. Results showed that, compared to CK, the S1 treatment led to increased biomass, the boll capacity of the root system (BCR), and a reduced root-to-shoot ratio (R/S). In addition, the S1 treatment enhanced the net photosynthetic rate (Pn) and chlorophyll content (Chl) of cotton, enhancing the total carbon accumulation of boll (Cboll) and consequently, the seed cotton yield. However, the higher salinity treatments, S2 and S3, demonstrated a detrimental impact on these indicators. In comparison to CK, the S1 treatment showed a yield increase of 5.92% and 4.76% in the respective two years, yet the S2 and S3 treatments showed a yield decrease of 5.55-15.77% and 5.06-16.74%. The application of a structural equation model (SEM) elucidated a direct effect of photosynthetic parameters (Pn and Chl) and biomass characteristics (total biomass, R/S, and BCR) on yield. These factors also indirectly modulated seed cotton yield through the Cboll/Croot ratio. These results suggest that irrigation with brackish water of 3 g L-1 optimizes cotton production by coordinating crop growth of aboveground and underground parts. This study offers practical strategies for the cotton industry to enhance yields under brackish water irrigation.

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