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

Author

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  • Guoqiang Zhang

    (Key Laboratory of Crop Physiology and Ecology, Ministry of Agriculture and Rural Affairs, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China)

  • Bo Ming

    (Key Laboratory of Crop Physiology and Ecology, Ministry of Agriculture and Rural Affairs, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China)

  • Dongping Shen

    (Key Laboratory of Crop Physiology and Ecology, Ministry of Agriculture and Rural Affairs, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China)

  • Ruizhi Xie

    (Key Laboratory of Crop Physiology and Ecology, Ministry of Agriculture and Rural Affairs, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China)

  • Peng Hou

    (Key Laboratory of Crop Physiology and Ecology, Ministry of Agriculture and Rural Affairs, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China)

  • Jun Xue

    (Key Laboratory of Crop Physiology and Ecology, Ministry of Agriculture and Rural Affairs, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China)

  • Keru Wang

    (Key Laboratory of Crop Physiology and Ecology, Ministry of Agriculture and Rural Affairs, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China)

  • Shaokun Li

    (Key Laboratory of Crop Physiology and Ecology, Ministry of Agriculture and Rural Affairs, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China)

Abstract

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 (ET a ) 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 ), ET a (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.

Suggested Citation

  • Guoqiang Zhang & Bo Ming & Dongping Shen & Ruizhi Xie & Peng Hou & Jun Xue & Keru Wang & Shaokun Li, 2021. "Optimizing Grain Yield and Water Use Efficiency Based on the Relationship between Leaf Area Index and Evapotranspiration," Agriculture, MDPI, vol. 11(4), pages 1-14, April.
    • Handle: RePEc:gam:jagris:v:11:y:2021:i:4:p:313-:d:529725
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    References listed on IDEAS

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    3. Yeotae Yun, 2023. "Changes in the Growth and Yield of an Extremely Early-Maturing Rice Variety According to Transplanting Density," Agriculture, MDPI, vol. 13(3), pages 1-12, March.
    4. Guoqiang Zhang & Dongping Shen & Bo Ming & Ruizhi Xie & Peng Hou & Jun Xue & Keru Wang & Shaokun Li, 2022. "Optimizing Planting Density to Increase Maize Yield and Water Use Efficiency and Economic Return in the Arid Region of Northwest China," Agriculture, MDPI, vol. 12(9), pages 1-12, August.
    5. Dejan Simić & Borivoj Pejić & Goran Bekavac & Ksenija Mačkić & Bojan Vojnov & Ivana Bajić & Vladimir Sikora, 2023. "Effect of Different ET-Based Irrigation Scheduling on Grain Yield and Water Use Efficiency of Drip Irrigated Maize," Agriculture, MDPI, vol. 13(10), pages 1-21, October.

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