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The purpose of this research was to determine the influence of the time when green cuttings were taken 1⁄2 and the influence of the position of the cutting in the branch in inducing adventive roots. The experiment has shown that the best results in rooting were achieved by 1⁄2 lignified cuttings with two leaves prepared in the middle of the branch and the 1⁄2 lignified cuttings with leaves taken from the branch-base (cuttings were taken from the year’s runners which have stopped growing and are less than one year old) since these parts are richer with nutrients and rhizogenic matter (auxins, phenolic materials and carbohydrates). Green cuttings were taken twice, on July 15th, 2015 in which rooting has reached 27.5 % whilst in the cuttings taken one month later, on August15th, 2015 during the same vegetation; the rooting % was higher, reaching 35%. To help induce the adventive roots, growth bio-regulators IBA and NAA were used in concentrations (-1500, 3000 and 4500 ppm-) and the control (without treatment). The low rooting % in green cuttings is referred to the physiologic condition of the cutting, the hormonal balance and the nutrition condition of the cutting related to the seasonal period and the fruit development phase. The best promoter in inducing adventive roots was IBA, whilst the most favourable substrate was torf-perlite at a 2:1 ratio.

international journal of science and research

The Effects of Indol Butyric Acid and Naphthalene Acetic Acid of Adventitious Root formation to Green Cuttings in Blueberry cv. (Vaccinium corymbosum L.)