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

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dc.contributor.author Taylor, N.J. (Nicolette)
dc.contributor.author Mahohoma, W.
dc.contributor.author Vahrmeijer, J.T.
dc.contributor.author Gush, M.B.
dc.contributor.author Allen, Robert Garth
dc.contributor.author Annandale, J.G. (John George), 1959-
dc.date.accessioned 2015-01-29T10:53:31Z
dc.date.available 2015-01-29T10:53:31Z
dc.date.issued 2015
dc.description.abstract The 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.embargo 2016-12-30 en_ZA
dc.description.librarian hb2015 en_ZA
dc.description.sponsorship South 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.uri http://link.springer.com/journal/271 en_ZA
dc.identifier.citation Taylor, 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.issn 0342-7188 (print)
dc.identifier.issn 1432-1319 (online)
dc.identifier.other 10.1007/s00271-014-0455-z
dc.identifier.uri http://hdl.handle.net/2263/43480
dc.language.iso en en_ZA
dc.publisher Springer en_ZA
dc.rights © Springer-Verlag Berlin Heidelberg 2014. The original publication is available at : http://link.springer.com/journal/271 en_ZA
dc.subject Water use of citrus en_ZA
dc.subject Irrigation scheduling en_ZA
dc.subject Water licenses en_ZA
dc.subject Crop water use en_ZA
dc.title Crop coefficient approaches based on fixed estimates of leaf resistance are not appropriate for estimating water use of citrus en_ZA
dc.type Postprint Article en_ZA


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