IMPROVED FEATHERING BY BENZYLADENINE APPLICATION ON ONE-YEAR-OLD 'IDARED' APPLE TREES IN THE NURSERY
As no appropriate data concerning improved lateral shoot formation of 'Idared' was available in the literature, in 1993 a study on the effect of BA application on lateral shoot formation was started. This paper presents the results of trials with the aim of finding the proper concentration, treatment period and frequency. BA was applied in water soluble formulation Paturyl 10 WSC containing 10% BA. The treatments were applied to one-year-old 'Idared' trees budded on Malling 26 rootstock. The following treatment combinations were applied: 1, untreated control; 2, 0.02% BA sprayed 3 times in June at 4-day intervals; 3, 0.02% BA sprayed 3 times in June at 8- or 9-day intervals; 4, 0.04% BA sprayed 3 times in June at 4-day intervals; 5, 0.04% BA sprayed 3 times in June at 8- or 9-day intervals; 6, 0.02% BA sprayed 6 times in June at 4- or 5-day intervals. Length and the number and quality of lateral shoots were measured and evaluated at the end of September 1995. BA treatments in 1995 were effective in breaking dormancy of summer buds of one-year-old 'Idared' nursery trees and caused lateral shoot formation. Both the concentration and the length of treatment period proved to be important in influencing the number and length of laterals. For 'Idared' trees the higher BA concentration (0.04%) proved to be more effective on the number of lateral shoots and on the ratio of longer shoots (10–30 cm). The longer treatment period (18 days) with the same BA concentration showed the same result as 8 days. Based upon our results using 0.04% BA, weekly sprays could be recommended at least 3 times. BA treatments reduced tree height by 10–15% in comparison to the untreated trees, but height was still sufficient. While the terminal shoot growth was reduced, the growth of laterals was increased by BA treatments, which means that the total growth of the trees was increased, distributed into terminal growth and growth of laterals. The concurrent growth of laterals may decrease terminal shoot growth.
Hrotkó, K., Magyar, L. and Bubán, T. (1997). IMPROVED FEATHERING BY BENZYLADENINE APPLICATION ON ONE-YEAR-OLD 'IDARED' APPLE TREES IN THE NURSERY. Acta Hortic. 451, 673-678
apple, benzyladenine (BA), feathering, growth regulators, lateral shoot formation, nursery trees, Paturyl 10 WSC