2018
DOI: 10.1016/j.agwat.2018.06.017
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Estimating the water requirements of high yielding and young apple orchards in the winter rainfall areas of South Africa using a dual source evapotranspiration model

Abstract: Exceptionally high yielding (>100 t ha-1) apple orchards (Malus domestica Borkh.) are becoming common in South Africa and elsewhere in the world. However, no accurate quantitative information currently exists on the water requirements of these orchards. Information is also sparse on the water use of young apple orchards. This paucity of data may cause inaccurate irrigation scheduling and water allocation decisions, leading to inefficient use of often limited water resources. The aim of this study was therefore… Show more

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Cited by 44 publications
(28 citation statements)
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“…However, when the deep-rooted trees are felled and shallow-rooted crops are planted, soil water content begins to recover, and groundwater recharge could increase by an order of magnitude after several decades of land-use change [21]. There is abundant information on the evolution for soil water content during the development of apple orchards [19,[22][23][24][25][26][27][28][29]; however, there is limited information on the evolution of soil water after the trees are felled.…”
Section: Introductionmentioning
confidence: 99%
“…However, when the deep-rooted trees are felled and shallow-rooted crops are planted, soil water content begins to recover, and groundwater recharge could increase by an order of magnitude after several decades of land-use change [21]. There is abundant information on the evolution for soil water content during the development of apple orchards [19,[22][23][24][25][26][27][28][29]; however, there is limited information on the evolution of soil water after the trees are felled.…”
Section: Introductionmentioning
confidence: 99%
“…Using the original model and the suggested eco-physiological stress factors and parameters as published by Fisher et al (2008) on apple orchards led to significant poor model performance for ET estimation and its constituent components (T and E s ) for orchards of all age groups as will be discussed in detail in the results section. It is known that water use from apple orchards is highly sensitive to soil water deficit and the vapour pressure deficit of the air (VPD) (Dzikiti et al, 2018a;Lo Bianco, 2019). Therefore, the model was subsequently improved by introducing two stress factors; one for soil moisture (f SM ) and the other for vapour pressure deficit of the air (f VPD ).…”
Section: Modelling Water Use Of Apple Orchards With the Pt-jpl Modelmentioning
confidence: 99%
“…Dragoni and Lakso, 2011;Rana et al, 2005), dual source Shuttleworth and Wallace type models (e.g. Ortega-Farias et al, 2012;Li et al, 2010;Allen et al, 1998 andDzikiti et al, 2018a) and models using remote sensing data (Odi-Lara et al, 2016). Given the heterogeneity that characterises orchard environments comprising trees in rows, bare ground, cover crops, and at times the mulch, dual source models provide more accurate ET estimates.…”
Section: Introductionmentioning
confidence: 99%
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“…Effective management of water resources in arid and semi-arid environments requires accurate tools to quantify key components of the hydrological cycle such as the evapotranspiration (ET). More than 70% of precipitation received in arid environments is returned to the atmosphere via ET annually (Zhang et al, 2016;Dzikiti et al, 2018). Consequently, ET is a major component in the processes and models of climate change, water balance, groundwater recharge, net primary productivity, floods, droughts and irrigation (Fisher et al, 2008;Műnch et al, 2013).…”
Section: Introductionmentioning
confidence: 99%