Measurement and modelling of water use by high yielding apple orchards and orchards of different age groups in the winter rainfall areas of South Africa

Show simple item record

dc.contributor.author Dzikiti, S.
dc.contributor.author Gush, M.B.
dc.contributor.author Taylor, N.J. (Nicolette)
dc.contributor.author Volschenk, T.
dc.contributor.author Midgley, S.
dc.contributor.author Lötze, E.
dc.contributor.author Schmeisser, M.
dc.contributor.author Doko, Q.
dc.date.accessioned 2017-08-23T05:47:47Z
dc.date.available 2017-08-23T05:47:47Z
dc.date.issued 2017
dc.description The research reported here formed part of a bigger project entitled “Quantifying water use by high performing apple orchards in the winter rainfall areas of South Africa” project no WRC K5/2398.
dc.description.abstract Apple production for the export market is in South Africa entirely dependent on irrigation. In recent years, high performing orchards yielding up to 120 t of fruit ha-1 are becoming common in a country where the average yield is between 60 and 80 t ha-1. This raises important questions regarding the sustainability of the exceptionally high yields given the limited availability of water for irrigation. Moreover, there is also no accurate quantitative information published on water use by apple orchards of different age groups and this compromises efficient irrigation scheduling. The aim of this study was to quantify water use by high yielding apple orchards and orchards of different age groups. Data were collected in four commercial orchards, two planted to non-bearing ‘Cripps’ Pink’ and ‘Golden Delicious’ apples and another two highyielding full-bearing orchards of these cultivars. Transpiration in the full-bearing orchards was measured using the heat pulse velocity sap flow method. Granier probes were used on the young non-bearing trees. Orchard evapotranspiration (ET) was measured using eddy covariance systems during selected periods. Ancillary data which included the orchard microclimate, stomatal resistance, soil water content and soil evaporation were also collected. The full-bearing ‘Golden Delicious’ orchard (22- year-old) had the highest seasonal transpiration of 785 mm, followed by the fullbearing ‘Cripps’ Pink’ (9-year-old) which transpired 587 mm. The non-bearing ‘Cripps’ Pink’ (3-year-old) transpired 272 mm compared to 198 mm for the nonbearing ‘Golden Delicious’ (2-year-old). The data were used to validate a dual source ET model based on the Shuttleworth-Wallace method. Transpiration of full-bearing orchards was accurately predicted by the model with the RMSE of 0.55 mm d-1 for ‘Cripps’ Pink’ and 0.70 mm d-1 for the ‘Golden Delicious’ orchards. Improvements to the substrate evaporation sub-model are required to account for various orchard floor management practices. en_ZA
dc.description.department Plant Production and Soil Science en_ZA
dc.description.librarian am2017 en_ZA
dc.description.sponsorship The Water Research Commission (WRC), with additional funding from Hortgro Science, through the South African Apple and Pear Producers Association (SAAPPA) in South Africa. en_ZA
dc.description.uri http://www.actahort.org en_ZA
dc.identifier.citation Dzikiti, S., Gush, M.B., Taylor, N.J., Volschenk, T., Midgley, S., Lötze, E., Schmeisser, M. & Doko, Q. 2017, 'Measurement and modelling of water use by high yielding apple orchards and orchards of different age groups in the winter rainfall areas of South Africa', Acta Horticulturae, vol. 1150, pp. 31-37. en_ZA
dc.identifier.issn 0567-7572 (online)
dc.identifier.other 10.17660/ActaHortic.2017.1150.5
dc.identifier.uri http://hdl.handle.net/2263/61763
dc.language.iso en en_ZA
dc.publisher International Society for Horticultural Science en_ZA
dc.rights International Society for Horticultural Science. This article is distributed under the Creative Commons Attribution 3.0 License. en_ZA
dc.subject Evapotranspiration en_ZA
dc.subject Malus en_ZA
dc.subject Sap flow en_ZA
dc.subject Shuttleworth-Wallace model en_ZA
dc.subject Soil evaporation en_ZA
dc.title Measurement and modelling of water use by high yielding apple orchards and orchards of different age groups in the winter rainfall areas of South Africa en_ZA
dc.type Article en_ZA


Files in this item

This item appears in the following Collection(s)

Show simple item record