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Grain yield and water productivity of maize under deficit irrigation and salt stress: Evidences from field experiment and literatures

文献类型： 外文期刊

作者： Gao, Jia 1 ; Li, Lin 1 ; Ding, Risheng 1 ; Kang, Shaozhong 1 ; Du, Taisheng 1 ; Tong, Ling 1 ; Kang, Jian 1 ; Xu, Wanli 4 ; Tang, Guangmu 4 ;

作者机构： 1.State Key Lab Efficient Utilizat Agr Water Resourc, Beijing, Peoples R China

2.Natl Field Sci Observat Res Stn Efficient Water Us, Wuwei 733009, Gansu, Peoples R China

3.China Agr Univ, Ctr Agr Water Res China, Beijing 100083, Peoples R China

4.Xinjiang Acad Agr Sci, Inst Soil Fertilizer & Agr Water Saving, Key Lab Saline Alkali Soil Improvement & Utilizat, Urumqi 830091, Peoples R China

关键词： Regulated deficit irrigation; Salt stress; Water productivity; Evapotranspiration; Stomatal characteristics

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： 2025 年 307 卷

页码：

收录情况： SCI

摘要： Drought and salt stress pose great challenges to global agriculture, yet mild deficit irrigation and salt stress have the potential to enhance water productivity (WP). However, it is not desirable to improve WP by reducing irrigation if it leads to a decrease in yield. This study aimed to investigate the effects of deficit irrigation and salt stress on maize yield and WP, as well as the underlying mechanism, and to explore agronomic practices to jointly improve maize yield and WP based on literature analysis. To achieve this, we conducted a 2-year field experiment with two maize genotypes (ZD958 and XY335), involving two irrigation levels (F: full irrigation and D: deficit irrigation, 65 % ET/80 % ET) and two salt levels (S0: no salt and S1: 2 parts per thousand). Additionally, we performed a synthesis analysis of peer-reviewed literature to assess the effects of deficit irrigation and/or salt stress on maize yield, evapotranspiration and WP. Our results showed that both deficit irrigation and salt stress increased leaf intrinsic water use efficiency (WUEi) and WP. Compared to the control (FS0), WP significantly increased by 11.5 % in DS0 and by 9.6 % in FS1, while decreased by 3.5 % in DS1. Furthermore, the increase in WP under single water and salt stress was attributed to the reduction in ET, while the decrease in WP under combined stress was attributed to the negative effect on grain yield. Both deficit irrigation and salt stress had adverse effects on leaf morpho-physiological traits and dry matter accumulation, with salt severely inhibiting the recovery ability after rewatering. Literature analysis showed that deficit irrigation increased WP by 10.5 %, and when coupled with agronomic practices such as controlled-release fertilizers and mulching, WP improved by 19.2 % without reducing the grain yield of maize. Deficit irrigation coupled with agronomic practices can achieve a win-win situation for both maize yield and WP. This study provides valuable insights into improving irrigation practices dealing with water shortages and salt stress in arid and semi-arid regions, further ensuring national food security.

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