Matching irrigation to vine-water requirements: limitations of using sap-flow technology for scheduling irrigation

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dc.contributor.author Yunusa, Isa en_US
dc.contributor.author Lu, Ping en_US
dc.contributor.author Eamus, Derek en_US
dc.contributor.author Walker, Robert R en_US
dc.date.accessioned 2009-12-21T02:30:49Z
dc.date.available 2009-12-21T02:30:49Z
dc.date.issued 2005 en_US
dc.identifier 2005001924 en_US
dc.identifier.citation Yunusa Isa et al. 2005, 'Matching irrigation to vine-water requirements: limitations of using sap-flow technology for scheduling irrigation', International Society for Horticultureal Science, vol. 694, pp. 165-171. en_US
dc.identifier.issn 0567-7572 en_US
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/3940
dc.description.abstract Mismatch between water applied during irrigation and that required by the crop for transpiration is a major cause of poor returns per unit water use and of land degradation. Advances in commercial sap-flow gauges should provide opportunities for improving water management in tree-horticulture, but this has not been widely explored. In this study we tested the capabilit of sap-flow guages to detect water stress and, hence a need for irrigation, by withholding water for two months from actively growing, mature grapevines. Withholding irrigation reduced soil-water content in the 1.8m soil-profile by almost 40% compared to where irrigation was maintianed, by the reduced soil-water resulted in only a small decrease in the transpirationdeduced from sap flow throughout the 2-month period. This was despite a 3-fold increase in stomatal resistance and a rise of 1.0 C in leaf temperature for the stressed compred to the continuously irrigated vines. Reasons for this response are not clear, but it is possible that the stressed vines accessed water either directly from the waterble or from its capillary fringe. Withdrawal of irrigation also did not result in yield for the stressed-vines. Other implications of these finding are explored including proposals on weighted crop factor to match irrigation with grape-vine water requirements. en_US
dc.publisher International Society for Horticultureal Science en_US
dc.title Matching irrigation to vine-water requirements: limitations of using sap-flow technology for scheduling irrigation en_US
dc.parent Acta Horticulturae en_US
dc.journal.volume 694 en_US
dc.journal.number en_US
dc.publocation Belgium en_US
dc.identifier.startpage 165 en_US
dc.identifier.endpage 171 en_US
dc.cauo.name DVCRch.Institute for Water & Environmental Resource Mgmnt en_US
dc.conference Verified OK en_US
dc.for 070600 en_US
dc.personcode 030005 en_US
dc.personcode 0000020600 en_US
dc.personcode 000006 en_US
dc.personcode 0000020601 en_US
dc.percentage 100 en_US
dc.classification.name Horticultural Production en_US
dc.classification.type FOR-08 en_US


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