BEHAVIOUR OF SUPERIOR GRAPEVINES TO APPLICATION OF SOME REST BREAKING AGENTS AND WINTER PRUNING I- THE EFFECT OF SOME BREAKING AGENTS

Abstract

This study was carried out during 2011/2012 and 2012/2013seasons to throw some lights on the effect of nine chemical and naturalrest breaking agents. (Dormex at 4%, brotacion at 4%, garlic oil at 5%,sodium azide at 1%, thiourea at 2%, oils of flax seed, clove and onioneach at 5% and H2O2 at 5%) on breaking dormancy and improvingproductivity of Superior grapevines.Using any one of the nine chemical and natural rest breakingagents was very effective in advancing the start and end of bud burst,shortening duration of bud burst and blooming periods and improving thepercentages of bud burst and fruiting buds, all growth aspects, leafpigments and nutrients, berry setting%, yield and quality of the berriesrelative to the check treatment. The best chemical and natural restbreaking agents were dormex at 4%, brotacion at 4% and garlic oil at 5%,respectively.Subjecting the vines to dormex or brotacion each at 4% gave thebest results with regard to breaking dormancy and promoting theproductivity of Superior grapevines. Under organic farming system, it issuggested to use garlic oil at 5%.