Crop coefficient approaches based on fixed estimates of leaf resistance are not appropriate for estimating water use of citrus

dc.contributor.authorTaylor, Nicolette Jane
dc.contributor.authorMahohoma, Walter
dc.contributor.authorVahrmeijer, J.T.
dc.contributor.authorGush, M.B.
dc.contributor.authorAllen, Robert Garth
dc.contributor.authorAnnandale, John George
dc.contributor.emailnicolette.taylor@up.ac.zaen_ZA
dc.date.accessioned2015-01-29T10:53:31Z
dc.date.available2015-01-29T10:53:31Z
dc.date.issued2015
dc.description.abstractThe estimation of crop water use is critical for accurate irrigation scheduling and water licenses. However, the direct measurement of crop water use is too expensive and time consuming to be performed under all possible conditions, which necessitates the use of water use models. The FAO-56 procedure is a simple, convenient and reproducible method, but as canopy cover and height vary greatly among different orchards, crop coefficients may not be readily transferrable from one orchard to another. Allen and Pereira (2009) therefore incorporated a procedure into the FAO-56 approach which estimates crop coefficients based on a physical description of the vegetation and an adjustment for relative crop stomatal control over transpiration. Transpiration crop coefficients derived using this procedure and fixed values for citrus, did not provide good estimates of water use in three citrus orchards. However, when mean monthly leaf resistance was taken into account, good agreement was found with measured values. A relationship between monthly reference evapotranspiration and mean leaf resistance provided a means of estimating mean leaf resistance which estimated transpiration crop coefficients with a reasonable degree of accuracy. The use of a dynamic estimate of mean leaf resistance therefore provided reasonable estimates of transpiration in citrus.en_ZA
dc.description.embargo2016-12-30en_ZA
dc.description.librarianhb2015en_ZA
dc.description.sponsorshipSouth Africa‟s Water Research Commission (Project K5/1770, Water use of fruit tree orchards), with cofounding from the South African National Department of Agriculture, Forestry and Fisheries.en_ZA
dc.description.urihttp://link.springer.com/journal/271en_ZA
dc.identifier.citationTaylor, NJ, Mahohoma, W, Vahrmeijer, JT, Gush, MB, Allen, RG & Annandale, JG 2015, 'Crop coefficient approaches based on fixed estimates of leaf resistance are not appropriate for estimating water use of citrus', Irrigation Science, NYP.en_ZA
dc.identifier.issn0342-7188 (print)
dc.identifier.issn1432-1319 (online)
dc.identifier.other10.1007/s00271-014-0455-z
dc.identifier.urihttp://hdl.handle.net/2263/43480
dc.language.isoenen_ZA
dc.publisherSpringeren_ZA
dc.rights© Springer-Verlag Berlin Heidelberg 2014. The original publication is available at : http://link.springer.com/journal/271en_ZA
dc.subjectWater use of citrusen_ZA
dc.subjectIrrigation schedulingen_ZA
dc.subjectWater licensesen_ZA
dc.subjectCrop water useen_ZA
dc.titleCrop coefficient approaches based on fixed estimates of leaf resistance are not appropriate for estimating water use of citrusen_ZA
dc.typePostprint Articleen_ZA

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