The influence of growth regulators on increasing the degree of setting and fruit production in the Idared apple plantation

Abstract

The experimental plot is placed in the orchard “Codru-ST” Ltd. founded in 2012 year. The study subject of the experience was Idared apple variety grafted on M9 rootstock. The distance of plantation is 3.5x 0.8 m. The research was conducted during the period of 2016 year. The tested agents was Wuxal Bio Ascofol, 3.0 l/ha; Stimolante 66 f, 0.2 l/ha; Stimolante 66 f, 0.3 l/ha, which was sprayed in different period. During the research, it was studied the chlorophyll content in leaves, the quantity of flowers, the quantity of fruits, the fruit setting, the production at a tree and at a surface unit, the quality of the fruits. It was established that the higher results were obtained by treating apple trees with Stimolante 66 f at a dose of 0.3 l/ha, applied twice by foliar spraying. The first treatment should be done at the beginning of the flowering period, and the second after the fall of the petals.