Crop coefficient approaches based on fixed estimates of leaf resistance are not appropriate for estimating water use of citrus
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 procedur...
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| Language: | English |
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Springer - Verlag
2020
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| Online Access: | https://link.springer.com/article/10.1007/s00271-014-0455-z http://hdl.handle.net/11408/3834 |
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| author | Taylor, N.J Mahohoma, W Vahrmeijer, J.T Gush, M.B Allen, R.G Annandale, J.G |
| author_facet | Taylor, N.J Mahohoma, W Vahrmeijer, J.T Gush, M.B Allen, R.G Annandale, J.G |
| author_sort | Taylor, N.J |
| collection | DSpace |
| description | 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 (Irrig Sci 28:17–34, 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. |
| format | Article |
| id | ir-11408-3834 |
| institution | My University |
| language | English |
| publishDate | 2020 |
| publisher | Springer - Verlag |
| record_format | dspace |
| spelling | ir-11408-38342022-06-27T13:49:06Z Crop coefficient approaches based on fixed estimates of leaf resistance are not appropriate for estimating water use of citrus Taylor, N.J Mahohoma, W Vahrmeijer, J.T Gush, M.B Allen, R.G Annandale, J.G leaf resistance water use citrus 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 (Irrig Sci 28:17–34, 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. 2020-10-20T07:49:48Z 2020-10-20T07:49:48Z 2014 Article https://link.springer.com/article/10.1007/s00271-014-0455-z http://hdl.handle.net/11408/3834 en Irrigation Science;Vol. 33, p.153–166 open Springer - Verlag |
| spellingShingle | leaf resistance water use citrus Taylor, N.J Mahohoma, W Vahrmeijer, J.T Gush, M.B Allen, R.G Annandale, J.G Crop coefficient approaches based on fixed estimates of leaf resistance are not appropriate for estimating water use of citrus |
| title | Crop coefficient approaches based on fixed estimates of leaf resistance are not appropriate for estimating water use of citrus |
| title_full | Crop coefficient approaches based on fixed estimates of leaf resistance are not appropriate for estimating water use of citrus |
| title_fullStr | Crop coefficient approaches based on fixed estimates of leaf resistance are not appropriate for estimating water use of citrus |
| title_full_unstemmed | Crop coefficient approaches based on fixed estimates of leaf resistance are not appropriate for estimating water use of citrus |
| title_short | Crop coefficient approaches based on fixed estimates of leaf resistance are not appropriate for estimating water use of citrus |
| title_sort | crop coefficient approaches based on fixed estimates of leaf resistance are not appropriate for estimating water use of citrus |
| topic | leaf resistance water use citrus |
| url | https://link.springer.com/article/10.1007/s00271-014-0455-z http://hdl.handle.net/11408/3834 |
| work_keys_str_mv | AT taylornj cropcoefficientapproachesbasedonfixedestimatesofleafresistancearenotappropriateforestimatingwateruseofcitrus AT mahohomaw cropcoefficientapproachesbasedonfixedestimatesofleafresistancearenotappropriateforestimatingwateruseofcitrus AT vahrmeijerjt cropcoefficientapproachesbasedonfixedestimatesofleafresistancearenotappropriateforestimatingwateruseofcitrus AT gushmb cropcoefficientapproachesbasedonfixedestimatesofleafresistancearenotappropriateforestimatingwateruseofcitrus AT allenrg cropcoefficientapproachesbasedonfixedestimatesofleafresistancearenotappropriateforestimatingwateruseofcitrus AT annandalejg cropcoefficientapproachesbasedonfixedestimatesofleafresistancearenotappropriateforestimatingwateruseofcitrus |