New pathways and the associated uncertainties for increasing maize water use efficiency under global warming

Mahdi Kalanaki, Fatemeh Karandish, Henk Ritzema, Moosa Kalanaki

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The DSSAT4.7-CERES model was employed to simulate plant-water nexus
conditions in the future of Mazandaran province in Iran, using ensemble
outputs of various GCMs and emission scenarios with LARS-WG 5.5 in the
time period 2010–2100. The results showed during the 21st century, maize
water requirement is expected to be reduced by 3.3–14.1%. Under climate
change scenarios, both negative and positive changes in crop yield are
projected, between −37.4 and 36.1%, which consequently results in a 5.-
1–27.2% reduction in water use efficiency (WUE) in the future periods.
Deficit irrigation (DI) with 25% reduction in irrigation water depth (DI75)
lead to a moderate reduction of 4.3–5.5% in WUE, but WUE was highly
reduced under DI55. While early planting may reduce WUEs by 0.4–17%,
late planting almost resulted in improved WUE, especially under DI75. Less
frequent irrigation significantly reduces actual evapotranspiration, which
consequently resulted in improved WUE by 0.57–42.47%. In conclusion,
the integrated assessment reveals that DI75, with an irrigation interval of
5 days, together with a 20 days delay in cropping date of maize in
Mazandaran province, may be considered as an effective adaptation
solution, when considering both food and water security.
Original languageEnglish
JournalArchives of Agronomy and Soil Science
DOIs
Publication statusE-pub ahead of print/First online - 28 Dec 2020

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