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Evapotranspiration and Yield Impact Tools for More Water-Use Efficient Alfalfa Production in Desert Environments

Author

Listed:
  • Aliasghar Montazar

    (Division of Agriculture and Natural Resources, University of California Cooperative Extension, Imperial County, 1050 East Holton Road, Holtville, CA 92250, USA)

  • Daniel Putnam

    (Department of Plant Sciences, University of California Davis, One Shields Ave., Davis, CA 95616, USA)

Abstract

Drought and climate change have decreased water availability for agriculture, especially in the desert of southwestern USA. Efficiency enhancements in irrigation management aimed at conserving water are key to adjust to limits in water supply, improve profitability and sustainability of alfalfa production in arid and semiarid areas. This study intended to conduct a field-scale analysis to develop yield and ET estimation tools for the effective use of irrigation water in a desert alfalfa production system. Extensive data collection and trials were carried out over three years in nine fully irrigated commercial alfalfa fields in the low deserts of California. The seasonal crop water consumption measured using the residual of energy balance method varied from 1381 mm to 1596 mm across the experimental sites and crop seasons. Variable seasonal dry mater (DM) yields ranged from 23.01 Mg ha −1 to 29.90 Mg ha −1 . The results indicated that the first five cuttings each year were the most productive cuttings with a mean DM value ranged between 3.29 (cut 1) and 4.21 (cut 4) Mg ha −1 but declined in later cuttings. An average annual water productivity (WP) value of 17.0 kg ha −1 mm −1 was determined across the sites varying from 15.5 to 18.9 kg ha −1 mm −1 . The findings suggested that one may lose up to 1.44 Mg ha −1 alfalfa yields with moderate summer deficit irrigation strategies, using 40% less water applied than full irrigation practices over the summer period of July–September. A more severe summer water deficit, with no irrigation event over the summer period of July–September may result in a potential water savings of 0.234–0.246 (ha·m) ha −1 and 19–21% seasonal yield losses in the desert environment. This study describes the seasonal yield pattern, the crop water use-production function, and the crop coefficient values for various harvest cycles over the crop season. These tools may assist farmers to quantify water savings and estimate yield losses for more accurate and effective irrigation management strategies to meet water conservation objectives and for the resiliency of alfalfa production in the desert region.

Suggested Citation

  • Aliasghar Montazar & Daniel Putnam, 2023. "Evapotranspiration and Yield Impact Tools for More Water-Use Efficient Alfalfa Production in Desert Environments," Agriculture, MDPI, vol. 13(11), pages 1-21, November.
  • Handle: RePEc:gam:jagris:v:13:y:2023:i:11:p:2098-:d:1274397
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    References listed on IDEAS

    as
    1. Liu, Minguo & Wu, Xiaojuan & Yang, Huimin, 2022. "Evapotranspiration characteristics and soil water balance of alfalfa grasslands under regulated deficit irrigation in the inland arid area of Midwestern China," Agricultural Water Management, Elsevier, vol. 260(C).
    2. Shi, Jianchu & Wu, Xun & Wang, Xiaoyu & Zhang, Mo & Han, Le & Zhang, Wenjing & Liu, Wen & Zuo, Qiang & Wu, Xiaoguang & Zhang, Hongfei & Ben-Gal, Alon, 2020. "Determining threshold values for root-soil water weighted plant water deficit index based smart irrigation," Agricultural Water Management, Elsevier, vol. 230(C).
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    4. Hanson, Blaine & Putnam, Dan & Snyder, Richard, 2007. "Deficit irrigation of alfalfa as a strategy for providing water for water-short areas," Agricultural Water Management, Elsevier, vol. 93(1-2), pages 73-80, October.
    5. Murphy, Sean R. & Boschma, Suzanne P. & Harden, Steven, 2022. "A lucerne-digit grass pasture offers herbage production and rainwater productivity equal to a digit grass pasture fertilized with applied nitrogen," Agricultural Water Management, Elsevier, vol. 259(C).
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