dc.contributor.author |
Ibraimo, NA
|
|
dc.contributor.author |
Taylor, NJ
|
|
dc.contributor.author |
Steyn, JM
|
|
dc.contributor.author |
Gush, Mark B
|
|
dc.contributor.author |
Annandale, JG
|
|
dc.date.accessioned |
2017-02-03T08:36:33Z |
|
dc.date.available |
2017-02-03T08:36:33Z |
|
dc.date.issued |
2016-11 |
|
dc.identifier.citation |
Ibraimo, N.A., Taylor, N.J., Steyn, J.M., Gush, M.B. and Annandale, J.G. 2016. Estimating water use of mature pecan orchards: A six stage crop growth curve approach. Agricultural Water Management, 177, pp 359–368 |
en_US |
dc.identifier.issn |
0378-3774 |
|
dc.identifier.uri |
http://www.sciencedirect.com/science/article/pii/S0378377416303080
|
|
dc.identifier.uri |
http://hdl.handle.net/10204/8933
|
|
dc.description |
Copyright: 2016 Elsevier. Due to copyright restrictions, the attached PDF file only contains the abstract of the full text item. For access to the full text item, please consult the publisher's website. The definitive version of the work is published in Agricultural Water Management, 177, 359-368 |
en_US |
dc.description.abstract |
Mature pecans use large quantities of water and therefore the accurate estimation of water use or evapotranspiration (ET) of pecan orchards is critical for judicious irrigation water management and planning. Measuring ET under all possible combinations of climate and management practices is not possible, and as a result, models are used to estimate ET. Empirical modelling approaches are more widely adopted than the more complex mechanistic models, as they are more easily parameterized, but they are not always easily transferred across a wide range of growing conditions, making local evaluation and validation essential. This study evaluated existing crop coefficient models in a mature pecan orchard for three seasons in a semi-arid subtropical climate. Whilst the generic FAO-56 approach, using parameters provided for stone fruit performed reasonably well on a seasonal basis, accurate monthly estimates of ET were not achieved throughout the season. A closer analysis of data from the current study and a previous study in New Mexico, revealed that a six stage crop coefficient curve should be considered for pecans, together with higher mid-season crop coefficient (K(subc)) values for mature orchards. More accurate estimates of monthly ET for mature pecan orchards were obtained when reference K(subc) (K(subc-subref) values for a well-managed mature pecan orchard in New Mexico were adjusted for local conditions of climate, using a growing degree day—K(subc) relationship and canopy cover. The adjustment for climate should, however, be used with caution. A comparison between seasons at Cullinan and with New Mexico suggests that whilst thermal time is likely to predict the start of leaf fall, it is unlikely to accurately predict canopy development at the start of the season. As a result it is suggested that in future a crop growth curve based on visual observations of phenological stages is developed. |
en_US |
dc.language.iso |
en |
en_US |
dc.publisher |
Elsevier |
en_US |
dc.relation.ispartofseries |
Wokflow;17583 |
|
dc.subject |
Agricultural water management |
en_US |
dc.subject |
Pecan orchards |
en_US |
dc.subject |
Evapotranspiration |
en_US |
dc.subject |
Crop coefficients |
en_US |
dc.subject |
Growing degree days |
en_US |
dc.subject |
Fractional canopy cover |
en_US |
dc.subject |
Perennials |
en_US |
dc.title |
Estimating water use of mature pecan orchards: A six stage crop growth curve approach |
en_US |
dc.type |
Article |
en_US |
dc.identifier.apacitation |
Ibraimo, N., Taylor, N., Steyn, J., Gush, M. B., & Annandale, J. (2016). Estimating water use of mature pecan orchards: A six stage crop growth curve approach. http://hdl.handle.net/10204/8933 |
en_ZA |
dc.identifier.chicagocitation |
Ibraimo, NA, NJ Taylor, JM Steyn, Mark B Gush, and JG Annandale "Estimating water use of mature pecan orchards: A six stage crop growth curve approach." (2016) http://hdl.handle.net/10204/8933 |
en_ZA |
dc.identifier.vancouvercitation |
Ibraimo N, Taylor N, Steyn J, Gush MB, Annandale J. Estimating water use of mature pecan orchards: A six stage crop growth curve approach. 2016; http://hdl.handle.net/10204/8933. |
en_ZA |
dc.identifier.ris |
TY - Article
AU - Ibraimo, NA
AU - Taylor, NJ
AU - Steyn, JM
AU - Gush, Mark B
AU - Annandale, JG
AB - Mature pecans use large quantities of water and therefore the accurate estimation of water use or evapotranspiration (ET) of pecan orchards is critical for judicious irrigation water management and planning. Measuring ET under all possible combinations of climate and management practices is not possible, and as a result, models are used to estimate ET. Empirical modelling approaches are more widely adopted than the more complex mechanistic models, as they are more easily parameterized, but they are not always easily transferred across a wide range of growing conditions, making local evaluation and validation essential. This study evaluated existing crop coefficient models in a mature pecan orchard for three seasons in a semi-arid subtropical climate. Whilst the generic FAO-56 approach, using parameters provided for stone fruit performed reasonably well on a seasonal basis, accurate monthly estimates of ET were not achieved throughout the season. A closer analysis of data from the current study and a previous study in New Mexico, revealed that a six stage crop coefficient curve should be considered for pecans, together with higher mid-season crop coefficient (K(subc)) values for mature orchards. More accurate estimates of monthly ET for mature pecan orchards were obtained when reference K(subc) (K(subc-subref) values for a well-managed mature pecan orchard in New Mexico were adjusted for local conditions of climate, using a growing degree day—K(subc) relationship and canopy cover. The adjustment for climate should, however, be used with caution. A comparison between seasons at Cullinan and with New Mexico suggests that whilst thermal time is likely to predict the start of leaf fall, it is unlikely to accurately predict canopy development at the start of the season. As a result it is suggested that in future a crop growth curve based on visual observations of phenological stages is developed.
DA - 2016-11
DB - ResearchSpace
DP - CSIR
KW - Agricultural water management
KW - Pecan orchards
KW - Evapotranspiration
KW - Crop coefficients
KW - Growing degree days
KW - Fractional canopy cover
KW - Perennials
LK - https://researchspace.csir.co.za
PY - 2016
SM - 0378-3774
T1 - Estimating water use of mature pecan orchards: A six stage crop growth curve approach
TI - Estimating water use of mature pecan orchards: A six stage crop growth curve approach
UR - http://hdl.handle.net/10204/8933
ER -
|
en_ZA |