Optimizing Grain Yield and Water Use Efficiency Based on the Relationship between Leaf Area Index and Evapotranspiration

文献类型： 外文期刊

第一作者： Zhang, Guoqiang

作者： Zhang, Guoqiang;Ming, Bo;Shen, Dongping;Xie, Ruizhi;Hou, Peng;Xue, Jun;Wang, Keru;Li, Shaokun

作者机构：

关键词： maize; plant density; irrigation amount; grain yield; evapotranspiration; water use-efficiency; leaf area index

期刊名称：AGRICULTURE-BASEL （ 影响因子：2.072； ）

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年卷期： 2021 年 11 卷 4 期

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收录情况： SCI

摘要： Achieving optimal balance between maize yield and water use efficiency is an important challenge for irrigation maize production in arid areas. In this study, we conducted an experiment in Xinjiang China in 2016 and 2017 to quantify the response of maize yield and water use to plant density and irrigation schedules. The treatments included four irrigation levels: 360 (W1), 480 (W2), 600 (W3), and 720 mm (W4), and five plant densities: 7.5 (D1), 9.0 (D2), 10.5 (D3), 12.0 (D4), and 13.5 plants m(-2) (D5). The results showed that increasing the plant density and the irrigation level could both significantly increase the leaf area index (LAI). However, LAI expansion significantly increased evapotranspiration (ETa) under irrigation. The combination of irrigation level 600 mm (W3) and plant density 12.0 plants m(-2) (D4) produced the highest maize yield (21.0-21.2 t ha(-1)), ETa (784.1-797.8 mm), and water use efficiency (WUE) (2.64-2.70 kg m(-3)), with an LAI of 8.5-8.7 at the silking stage. The relationship between LAI and grain yield and evapotranspiration were quantified, and, based on this, the relationship between water use and maize productivity was analyzed. Moreover, the optimal LAI was established to determine the reasonable irrigation level and coordinate the relationship between the increase in grain yield and the decrease in water use efficiency.

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