Estimating crop coefficients for vegetable production and agricultural water management under climate change in sub-humid tropics

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cg.contributor.affiliationInternational Water Management Instituteen
cg.contributor.affiliationInternational Center for Agricultural Research in the Dry Areasen
cg.contributor.affiliationNorman Borlaug Institute for International Agriculture, Texas A&M AgriLife Researchen
cg.contributor.donorUnited States Agency for International Developmenten
cg.contributor.donorCGIAR Trust Funden
cg.contributor.programAcceleratorSustainable Farming
cg.coverage.countryEthiopia
cg.coverage.iso3166-alpha2ET
cg.coverage.regionAfrica
cg.coverage.subregionLemo
cg.creator.identifierDesalegn Tegegne: 0000-0002-0288-2364
cg.creator.identifierPetra Schmitter: 0000-0002-3826-7224
cg.creator.identifierabeyou wale worqlul: 0000-0002-7990-8446
cg.identifier.doihttps://doi.org/10.3389/frwa.2025.1355154en
cg.identifier.iwmilibraryH053688
cg.identifier.projectIWMI - C-0052
cg.isijournalISI Journalen
cg.issn2624-9375en
cg.journalFrontiers in Wateren
cg.reviewStatusPeer Reviewen
cg.volume7en
dc.contributor.authorTegegne, Desalegnen
dc.contributor.authorSchmitter, Petraen
dc.contributor.authorWorqlul, A. W.en
dc.contributor.authorLefore, N.en
dc.date.accessioned2025-03-14T07:13:56Zen
dc.date.available2025-03-14T07:13:56Zen
dc.identifier.urihttps://hdl.handle.net/10568/173609
dc.titleEstimating crop coefficients for vegetable production and agricultural water management under climate change in sub-humid tropicsen
dcterms.abstractUnderstanding current and future crop water demand is crucial for improving agricultural productivity and managing long-term water resources in a changing climate. This study aimed to estimate how the crop water demand will change under different water management practices and climate change scenarios. The field experiment using irrigation decision-making tools was carried out in 2016 and 2017 in Lemo, Ethiopia. Crop and water management data were collected on cabbage and carrot production. The field data were used to estimate the crop coefficient (Kc), and the results were compared with the simulated Kc with the Agricultural Policy Environmental eXtender (APEX) model. Predicted future climate data were used in APEX to evaluate the effect of climate change on future crop water requirements and Kc. The field data analysis indicated that, on average, farmer traditional practice (FTP) treatments used more water than wetting front detector (WFD) treatments. Using the soil water balance method, the average of the two treatments’ Kc values at the initial, mid, and late stages was 0.71, 1.21, and 0.8 for cabbage and 0.69, 1.27, and 0.86 for carrot, respectively. The APEXsimulated Kc has captured the FAO Kc pattern very well with the coefficient of determination (R-square) ranging between 0.5 and 0.74. The APEX simulation and the soil water balance estimated Kc also indicated a strong association with R-square ranging between 0.5 and 0.75 for cabbage and 0.66 and 0.96 for carrot. The projected climate change analysis indicated that the crop water demand is expected to increase in the future due to increasing temperatures. Under climate change scenarios, the growing season potential evapotranspiration will increase by 2.5, 5.1, and 6.0% in 2025, 2055, and 2085 compared to the baseline period, respectively. The simulated Kc indicated a higher coefficient of variation in 2085 with 19% for cabbage and 24% for carrot, while the 2025 period simulated Kc indicated the least coefficient of variation (16 and 21% for cabbage and carrot, respectively). The study shows that current irrigation planning with the available water resources should take into account higher crop water requirements in the region to reduce water scarcity risks.en
dcterms.accessRightsOpen Access
dcterms.available2025-03-06
dcterms.bibliographicCitationTegegne, Desalegn; Schmitter, Petra; Worqlul, A. W.; Lefore, N. 2025. Estimating crop coefficients for vegetable production and agricultural water management under climate change in sub-humid tropics. Frontiers in Water, 7:1355154. [doi: https://doi.org/10.3389/frwa.2025.1355154]en
dcterms.extent1355154.en
dcterms.issued2025-03-06
dcterms.languageen
dcterms.licenseCC-BY-4.0
dcterms.publisherFrontiers Mediaen
dcterms.subjectcrop productionen
dcterms.subjectvegetablesen
dcterms.subjectagricultural water managementen
dcterms.subjectclimate changeen
dcterms.subjectirrigation schedulingen
dcterms.subjectwater productivityen
dcterms.subjectsubhumid climateen
dcterms.subjectwater demanden
dcterms.subjectsoil water balanceen
dcterms.subjectfarmersen
dcterms.typeJournal Article

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