RT Journal Article
SR Electronic
T1 Modification of the Light Factor and Heat Load in Vineyards
JF American Journal of Enology and Viticulture
JO Am J Enol Vitic.
FD American Society for Enology and Viticulture
SP 87
OP 92
DO 10.5344/ajev.1964.15.2.87
VO 15
IS 2
A1 Schultz, H. B.
A1 Lider, L. A.
YR 1964
UL http://www.ajevonline.org/content/15/2/87.abstract
AB Grape maturation in a vineyard at Davis was delayed by filtering solar light during the hot summer months. In general the grapes had higher levels of acidity at harvest under the low light conditions. The total requirement of Langleys (calories per cm2) for maturation may differ for various light regimes. White Riesling required about 110,000 calories, and Pinoit noir about 100,000 when grown in the open. However, it seems that a somewhat smaller accumulation would mature the grapes under the covers. This would indicate that the high light intensities available to the unshielded plants are not fully utilized.