RT Journal Article SR Electronic T1 Three Vine Management Techniques Used During Consecutive Years of Abnormally Low Winter Rainfall in the Napa Valley JF American Journal of Enology and Viticulture JO Am J Enol Vitic. FD American Society for Enology and Viticulture SP 117 OP 123 DO 10.5344/ajev.1982.33.2.117 VO 33 IS 2 A1 DeWitt Garlock YR 1982 UL http://www.ajevonline.org/content/33/2/117.abstract AB The effects of three cultural practices to offset low winter rainfall were determined in 1977. 1) The removal of fruiting canes in a non-irrigated vineyard significantly reduced the cluster yield by 54% (p < .05) without affecting pruning weights. 2) Limited application of summer drip and sprinkler irrigation (2.4 acre-inches) gave significantly higher vine yield, cluster counts and berry weights than the control (p < .05). Pruning weights were increased in the sprinkler irrigated treatments only. 3) When winter irrigation was applied at a low (5 in), medium (10 in), and heavy (10 in winter + 5 ABSTRACT in summer) rate, vine yield, cluster weight, cluster counts, and berry weights increased significantly in the heaviest application (p < .05). The pruning data showed a similar increase.Vineyard production was best accomplished by applying heavy amounts of winter irrigation. Limited summer drip and sprinkler irrigation was a successful means of vine maintenance, while the removal of fruiting canes was a poor method of managing non-irrigated vineyards.