Efficiency of chemical thinning in different treatment dose on Gala Must variety with products based on NAD, ANA and BA

Abstract

The study subjects were Gala Must apple variety grafted on M 9 rootstock and thinning active substances such as NAD (Geramid-New), NAA (Dirager) and BA (Gerba 4LG), using in different doses and thinning periods. During the research, such indicators as the number and average weight of the fruit, the yield per tree and per unit area and the average fruit diameter were studied. It was established that, the spray with Geramid-New in dose 1.2 l/ha when 80% of the petals have fallen + 2-3 days, Dirager in dose 0.3 l/ha when the king fruit diameter was 8-9 mm, and Gerba 4LG in dose 2.5 l/ha when the king fruit diameter was 10-15 mm have a significant effect on the number of the fruits, average weight, yield and fruits.