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https://hdl.handle.net/1959.11/9673
Title: | Matching Irrigation to Vine Water-requirements: Limitations of Using Sap-flow Technology for Scheduling Irrigation | Contributor(s): | Yunusa, Isa (author); Lu, Ping (author); Eamus, Derek (author); Walker, Rob R (author) | Publication Date: | 2005 | Handle Link: | https://hdl.handle.net/1959.11/9673 | 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 capability of sap-flow gauges 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 1.8 m soil-profile by almost 40% compared to where irrigation was maintained, but the reduced soil-water resulted in only a small decrease in the transpiration deduced 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 compared 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 watertable or from its capillary fringe. Withdrawal of irrigation also did not result in yield decline for the stressed-vines. The results showed the limitation of employing sap-flow systems in managing irrigation. Other implications of these findings are explored including proposals on using weighted crop factor to match irrigation with grapevine water-requirements. | Publication Type: | Journal Article | Source of Publication: | Acta Horticulturae, v.694, p. 165-171 | Publisher: | International Society for Horticultural Science | Place of Publication: | Belgium | ISSN: | 0567-7572 | Fields of Research (FoR) 2008: | 050299 Environmental Science and Management not elsewhere classified | Socio-Economic Objective (SEO) 2008: | 960699 Environmental and Natural Resource Evaluation not elsewhere classified | Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal | Publisher/associated links: | http://www.actahort.org/books/694/694_27.htm |
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Appears in Collections: | Journal Article |
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