Effect of Auxiger growth regulator on fruits development, production and chracing index of „Regina” cherry variety

Abstract

Fruit size and yield can be improved with the application of growth regulators, such as synthetic auxins and may be effective in enhancing fruit growth, when applied during the second stage of fruit development. The aim was to evaluate the influence of Auxiger growth regulator on average weight of fruits, fruit production, fruit size, period of maturation and cracking index. The study subject of the experience was ’Regina’ cherry variety, grafted on Gisela 6. The trees were trained as spindle system. The distance of plantation is 4.0 x 2.0 m. The experimental plot it was placed in the orchard „Vindex-Agro” Ltd. founded in 2012 year. The research was conducted during the period of 2016 year. To study average weight of fruits, fruit production, fruit size, period of maturation and cracking index were experimented the following variants of treatment: 1.Control – without treatment; 2. Auxiger, 0.5 l/ha; 3. Auxiger, 0.7 l/ha. Active ingredient of Auxiger is NAD – 1.5 g/l + ANA – 0.6 g/l. Growth regulator Auxiger were sprayed one time, during the period of intensive fruit growing, when the fruits diameter was 12-13 mm (26.05.16). During the research, it was studied the average of fruits, tree production and their quality, period of maturation and cracking index. During the analyzed period, it was established that the average weight of fruits, the plantation productivity, fruit size, period of maturation increase when treating with Auxiger growth regulators in dose of 0.7 l/ha and reduced the cracking index when the diameter of the fruits was 12 - 13 mm.