|ISHS Acta Horticulturae 1139: III Balkan Symposium on Fruit Growing
Effect of 6-BA+GA(4+7) and nitrogen fertigation on feathering of 'Golden Reinders' apple nine-month-old nursery trees
|Authors: ||D. Radivojević, M. Zivić, J. Milivojević, Č. Oparnica, M. Veličković|
|Keywords: ||plant growth regulator, nitrogen fertilization, nursery tree quality, lateral branches|
The apple (Malus × domestica Borkh.) cultivar ‘Golden Reinders’ was used to study the effects of mixture of 6-BA and GA(4+7) (Promalin) and nitrogen fertigation to improve branching of nine-month-old nursery trees grafted on ‘M9’ rootstock.
Promalin was applied three times in June in weekly intervals, in concentrations of 0, 500, 1000, 1500 and 2000 mg L-1 to the upper third of trees.
Nitrogen (N) was injected weekly at total amount of 50, 100, 150 and 200 kg ha-1 for season.
Obtained results indicated that nursery trees without Promalin treatment were characterized by significantly lower trunk than with Promalin treatments.
Application of N through the system in increasing rates significantly contributed to higher values of trunk diameter.
Tree leaders were significantly longer in Promalin treatments only when amounts of applied N were above 100 kg ha-1. However, N influence on height of nursery trees was not confirmed if they were not subjected to Promalin treatment.
Total number of feathers and the number of feathers >30 cm were simultaneously increasing with the increase of Promalin rates.
The same trend was observed with applying higher amounts of N. Significant interaction effect between Promalin and N confirmed in this study indicates that Promalin treatment has no effect on number of lateral branches without N application.
Increasing of Promalin concentrations above 1500 mg L-1 had no significant influence on the number of lateral branches and number of feathers >30 cm, regardless of N amounts.
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