@article {Christensen217, author = {Peter Christensen and A. N. Kasimatis}, title = {Correction of Vineyard Zinc Deficiency by Soil Injection of Zinc Sulfate Solutions}, volume = {18}, number = {4}, pages = {217--224}, year = {1967}, doi = {10.5344/ajev.1967.18.4.217}, publisher = {American Journal of Enology and Viticulture}, abstract = {Replicated trials were conducted in three Fresno County vineyards to determine the effect of soil injections of zinc sulfate solution on the expression of vine symptoms of zinc deficiency. All rates of zinc sulfate, ranging from 1/8 lb to 4 lb per vine, reduced symptoms and increased zinc levels in the petioles of recently matured leaves. Two-year vines in one trial required 1 lb zinc sulfate per vine for marked correction; the 2 lb and 4 lb rates gave excellent response in the trial with mature vines. All treatments persisted at least two years, the duration of the study.Phytotoxicity was not a problem and resulted only where the high rate of zinc sulfate was applied during the growing season; none was observed with dormant season treatments. The technique of deep placement of zinc by injection is promising for localized problem areas which do not respond satisfactorily to standard correction methods.}, issn = {0002-9254}, URL = {https://www.ajevonline.org/content/18/4/217}, eprint = {https://www.ajevonline.org/content/18/4/217.full.pdf}, journal = {American Journal of Enology and Viticulture} }