The Study of Dormancy Breaking in Grapevine Buds by Using Chemical in Ahvaz Area

Abstract

The effects of dormancy breaking chemical have long been specified and the utilization of these materials are common in many subtropical areas where do not provide adequate chilling requirement for buds to bloom. Although, grape as a fruit that is grown in subtropical areas does not have a high chilling requirement, its fulfillment is crucial to release bud dormancy and for its optimal growth. So, it is necessary to consider the effect of dormancy-breaking chemical on this product. In present research, the effects of dormex in three concentrations of 3%, 5% and 7% and volk oil in three concentrations of 3%, 5% and 7% as two bud dormancy breaking chemical have been evaluated in a split-plot experiment on some qualitative and quantitative properties of Sultani grape cultivar such as yield, bunch weight, number of berry per bunch, bunch length and width, length and volume of berry, 100 berries' weight, number of seeds per berry and pH, TSS, TA, TSS / TA, and vitamin C. Results which were analyzed by SAS software indicated that in bushes treated with 7% dormex and 7% volk oil, the yield and bunch weight, bunch length and width, berry weight and volume dramatically increased, and this increase is proportional to the concentration of applied substance. Generally, it is concluded that the application of dormancy-breaking chemicals has great impact on yield improvement and other quantitative and qualitative characteristics of grapevine bushes and can meet the side effects resulting from the lack of adequate chilling requirement of grapevine. The application of 7% dormex significantly increased the quantitative and qualitative characteristics of grapevine in Ahvaz.