A field trial with growth regulators on the Zante currant (<i>Vitis vinifera</i> var.)
DOI:
https://doi.org/10.5073/vitis.1967.6.14-20Abstract
A field trial using young currant vines (Vitis vinifera var. Zante currant) which had never been cinctured showed that over a 5-year period with treatments applied at about 90% capfall phenoxyacetic acid sprays were somewhat less effective and gibberellic aci:d sprays more effective than cincturing (giDdling) in increasing crop. Parachlorophenoxyacetic acid at 20 p.p.pm. and 2,4-D at 5 p.p.m. were equivalent in effect. Gibberellic acid at 10 p.p m. was about equal in effect to cincturing and at 20 p.p.pm. more effective. Gibberellic aci:d at 10 p.p.m. in addition to cincturing gave a further significant increase in yield.The increased yield in all cases appeared to be entirely due to an increase in mean berry weight. Small hard seeds were found in the largest berries from each treatment in one season when an examination was made and there d:,d not appear to be any difference in the proportion of such berries among the various treatments. There was little evidence for any differences in time of maturity due to treatment.
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