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dc.contributor.authorElshikha, Diaa Eldin M.
dc.contributor.authorWang, Guangyao
dc.contributor.authorWaller, Peter M.
dc.contributor.authorHunsaker, Douglas J.
dc.contributor.authorDierig, David
dc.contributor.authorThorp, Kelly R.
dc.contributor.authorThompson, Alison
dc.contributor.authorKatterman, Matthew E.
dc.contributor.authorHerritt, Matthew T.
dc.contributor.authorBautista, Eduardo
dc.contributor.authorRay, Dennis T.
dc.contributor.authorWall, Gerard W.
dc.identifier.citationElshikha, D. E. M., Wang, G., Waller, P. M., Hunsaker, D. J., Dierig, D., Thorp, K. R., Thompson, A., Katterman, M. E., Herritt, M. T., Bautista, E., Ray, D. T., & Wall, G. W. (2023). Guayule growth and yield responses to deficit irrigation strategies in the U.S. desert. Agricultural Water Management, 277.en_US
dc.description.abstractDeficit irrigation can maximize the water productivity (WP) of guayule and increase the percent rubber (%R) in shrubs compared to irrigation meeting full crop evapotranspiration (ETc). In this study, we hypothesize that certain deficit irrigation strategies that impose soil water deficits during specific periods of growth or throughout the growing season might produce higher %R and equivalent rubber yield (RY), thereby, increasing WP compared to full irrigation. Herein, growth and yield responses of direct-seeded guayule to different water deficit schemes were evaluated in an experiment on a silty clay loam soil, in a field in central Arizona using furrow irrigation. Two guayule cultivars (AZ2 and AZ6) were grown for 22.5 months (Apr. 2020-Mar. 2022) in a split-plot design, with six irrigation treatments in whole plots and cultivars in split-plots. After homogeneous irrigation for two months, irrigation treatments were begun. A control treatment was irrigated to meet full ETc. The other five treatments were irrigated with less water using various deficit irrigation strategies imposed during the two-year growing period. Measurements included plant height (h), cover fraction (fc), soil water contents, harvest of dry biomass (DB), RY, resin yield (ReY), %R, and percent resin (%Re). Total water applied (TWA) by irrigation and precipitation to treatments varied from 2780 to 1084 mm and DB varied from 20.5 to 9.1 Mg ha−1. The h and fc were significantly greater at higher irrigation levels, while they were also significantly greater in AZ6 than AZ2. The DB, RY, and ReY generally increased linearly with TWA. However, it was found that a treatment applying every other irrigation of the control resulted in statistically equivalent yields to the control, with 36% less irrigation. The %R generally decreased with TWA, while %Re did not change. However, DB, %R, and %Re were significantly greater for AZ2 than AZ6, as were RY, ReY, and WP. Among the deficit treatments evaluated, every other irrigation offers the best strategy to significantly increase guayule WP without causing a yield penalty.en_US
dc.description.sponsorshipUSDA NIFAen_US
dc.publisherElsevier BVen_US
dc.rights© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (
dc.subjectEarth-Surface Processesen_US
dc.subjectSoil Scienceen_US
dc.subjectWater Science and Technologyen_US
dc.subjectAgronomy and Crop Scienceen_US
dc.titleGuayule growth and yield responses to deficit irrigation strategies in the U.S. deserten_US
dc.contributor.departmentBiosystems Engineering Department, The University of Arizonaen_US
dc.contributor.departmentSchool of Plant Sciences, The University of Arizonaen_US
dc.identifier.journalAgricultural Water Managementen_US
dc.description.noteOpen access articleen_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at
dc.eprint.versionFinal published versionen_US
dc.source.journaltitleAgricultural Water Management

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© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (
Except where otherwise noted, this item's license is described as © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (