Abstract
Leaf and berry temperatures, cluster water loss, and stomatal resistances of Vitis vinifera L. grape-vines 'Carignane', 'Muscat of Alexandria', and 'Torontel' were determined.
The temperature of exposed fruits were 1.4 to 7.3°C higher than air temperatures and shaded berries were 0.5 to 4.4°C lower than air temperatures between 8:00 a.m. and 6:00 p.m. The maximum temperature differential across the berry at a given time was 10.7°C. The increase in berry temperature above air temperature was the result of low transpirational cooling. The latent heat flux density and the change in heat storage terms were only a small fraction of the total energy balance of the grape berry, and most of the absorbed energy went into sensible heat.
Leaf temperatures were very close to air temperatures.
Transpirational cooling in leaves is very efficient as a result of low stomatal resistances at times of high energy load. The abaxial stomatal resistances decreased with increasing leaf temperature.
- Copyright 1972 by the American Society for Enology and Viticulture
Sign in for ASEV members
ASEV Members, please sign in at ASEV to access the journal online.
Sign in for Institutional and Non-member Subscribers
Log in using your username and password
Pay Per Article - You may access this article (from the computer you are currently using) for 2 day for US$10.00
Regain Access - You can regain access to a recent Pay per Article purchase if your access period has not yet expired.
Vol 23 Issue 4
