Effect of naphthaleneacetic acid (NAA) on preharvest drop of Gala Must apple variety

Abstract

The experimental plot is placed in the orchard “Dacfruct” Ltd. founded in 2006. The study subject of the experience was Gala Must apple variety grafted on M 9. The trees were trained as slender spindles. The distance of plantation is 3.5 x 1.2 m. The research was conducted during the period of 2013 year. The aim of this study was to evaluate the effectiveness of grower regulator Obsthormon 24a in reducing fruit drop of apple trees. The tested agents were NAA, which was sprayed in one time in preharvest period. During the research, it was studied the quantity of dropped fruits under the trees and percentage of total fruit yield. It was established that, one treatment with Obsthormon 24a in dose of 300 ml/ha have a significant effect on fruit drop and there quality.