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Article

Thermal Regime of Grapevines

A. A. Millar
Am J Enol Vitic. January 1972 23: 173-176; published ahead of print January 01, 1972
A. A. Millar
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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

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Thermal Regime of Grapevines
A. A. Millar
Am J Enol Vitic.  January 1972  23: 173-176;  published ahead of print January 01, 1972

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Thermal Regime of Grapevines
A. A. Millar
Am J Enol Vitic.  January 1972  23: 173-176;  published ahead of print January 01, 1972
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