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Am. J. Enol. Vitic. 38:2:113-119 (1987)
Copyright © 1987 by the American Society for Enology and Viticulture.
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Development of a Drip Irrigation Schedule for Average-Canopy Vineyards in the San Joaquin Valley

William L. Peacock 1, L. Peter Christensen 2, and Harry L. Andris 3

1 Tulare County, Visalia, CA 93291
2 Kearney Agriculture Center, Parlier, CA 93648
3 Fresno County, Fresno, CA 93702.

A drip irrigation schedule (ETvine) was developed for vineyards of average canopy size in California's San Joaquin Valley. ETvine is based on the National Weather Service's historical evapotranspiration values for the reference crop alfalfa (ETp) utilizing the Jensen-Haise energy balance equation. The ETvine was evaluated by two consecutive years of field testing. Shoot growth and yield were reduced with daily drip irrigations at frac12 ETvine, whereas [unknown] ETvine delayed fruit maturity and reduced shoot growth. Leaf water potential (psgrL) became less negative with increasing amounts of water applied. Soil water matrix potential (psgrM) was reduced as well as stored soil water with less than schedule amounts. Results verified ETvine to be an effective drip irrigation guide for average-canopy vineyards (55% of the ground area shaded with the sun directly overhead). Submitted on November 13, 1984






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Copyright © 1987 by the American Society for Enology and Viticulture.