The action of products based on NAD, ANA and BA on the fruit load control in Golden Reinders apple trees

Abstract

The research was carried out in the plantation of the LLC `Codru ST` enterprise founded in 2006. The efficiency of apple fruits chemical thinning on Golden Reinders variety grafted on the M9 rootstock was studied, under the action of the naphthylacetamide NAD (Geramid-New), naphthylacetic acid ANA (Dirager) and benzyladenine BA (Gerba 4LG), in different doses and thinning periods. Optimum values for the number of fruits in the crown, the average weight of a fruit, the production of fruits per tree and per hectare, as well as the average diameter of a fruit were obtained in the case of treatment with Geramid-New products 2.0 l/ha, Dirager 0.4 l/ha and Gerba 4LG 2.5 l/ha, recording values similar to the manual thinning option. A significant effect was recorded when treating with Geramid-New 2.0 l/ha when 80% of petals fell + 2-3 days, with Dirager 0.4 l/ha when the central fruit diameter was 8-9 mm and Gerba 4LG 2.5 l/ha when the fruit diameter was 10-15 mm.