Abstract
Zn-EDTA and zinc sulfate at 150 and 750 lb per acre, respectively, were used as soil treatments to correct zinc deficiency of grapes on a sandy, neutral soil with relatively low fixing power for zinc. Both resulted in striking increases in fruit production. Although tissue analysis 9 years later showed higher zinc levels in treated vines, the practical effect on yields ended 3 years after treatment.
A one-year Zn-EDTA foliage spray treatment also resulted in greatly increased fruit yield, but without zinc treatment the following year, the second-year yields were appreciably lower than those from control plots.
Effects of lower soil treatment rates and factors affecting foliar absorption need further investigation.
- Copyright 1963 by the American Society for Enology and Viticulture
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