The efficacy of fruit growth regulators on fruit yield of Kordia and Regina varieties

Abstract

The research was carried out in the plantation of the S.R.L. "Staragro Group" company in 2019-2020. The orchard was planted in the spring of 2015. As the object of research were the trees of Kordia and Regina varieties grafted on Gisela 6 rootstock. The following growth regulators were investigated in the research plot: Stimolante 66f (1-NAA, 0.1 g/l), Gobbi Gib 2LG (GA3, 20.54 g/l), ReTain (AVG, 150 g/l). During the research, indicators such as: fruit set, yield, fruit weight and firmness were studied. It was reported that applying ReTain at the dose of 0.8 kg/ha at 30 % tree flowering had a significant effect on fruit set (34.9-35.9 %), yield (11.06-12.34 t/ha) and while decreasing insignificantly the average fruit weight (9.81-10.65 g).