Articles
THE RELATIONSHIP BETWEEN GRAPEVINE SAP FLOW, ETO AND EFFECTIVE AREA OF SHADE
Article number
846_19
Pages
185 – 192
Language
English
Abstract
Accurate prediction of potential grapevine transpiration from reference crop evapotranspiration (ETo) and a basal crop coefficient (Kcb) is necessary to improve water use efficiency.
Sap flow (SF) was used in this study to estimate transpiration.
The relationship between SF and ETo adjusted by effective area of shade (EAS) for Shiraz grapevines (Vitis vinifera) was investigated during two seasons at a vineyard near Tatura, Australia.
SF was measured using the Tmax method.
Sap flow sensors (Tranzflo, Palmerston North, New Zealand) were installed in four vines at each of nine locations approximately 28 days after budburst (DABB) and were removed just prior to harvest.
Fractional canopy photosynthetically active radiation interception (fPAR) was measured three times per day at regular intervals throughout each season.
EAS was calculated as the average of fPAR measured at solar noon and solar noon ± 3.5 h.
Daily estimates of EAS were made by extrapolation.
ETo was computed every 15 min using the FAO standardised Penman-Monteith equation and data collected by an automated on-site weather station.
A strong linear relationship existed between daily SF under assumed well watered conditions and daily EAS.ETo.
Sap flow (SF) was used in this study to estimate transpiration.
The relationship between SF and ETo adjusted by effective area of shade (EAS) for Shiraz grapevines (Vitis vinifera) was investigated during two seasons at a vineyard near Tatura, Australia.
SF was measured using the Tmax method.
Sap flow sensors (Tranzflo, Palmerston North, New Zealand) were installed in four vines at each of nine locations approximately 28 days after budburst (DABB) and were removed just prior to harvest.
Fractional canopy photosynthetically active radiation interception (fPAR) was measured three times per day at regular intervals throughout each season.
EAS was calculated as the average of fPAR measured at solar noon and solar noon ± 3.5 h.
Daily estimates of EAS were made by extrapolation.
ETo was computed every 15 min using the FAO standardised Penman-Monteith equation and data collected by an automated on-site weather station.
A strong linear relationship existed between daily SF under assumed well watered conditions and daily EAS.ETo.
Publication
Authors
L. McClymont, I. Goodwin, D.M. Whitfield, S. Green
Keywords
basal crop coefficient, transpiration, Shiraz
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