In this research we have tested the rooting abilities of green and semihardwood cuttings with leaves in the ennobled blueberry (Vaccinium corymbosum L.) Bluecrop cultivar taken at the end of August, from shoots of the year when growth was stopped and they had not reached one year. These cuttings were stimulated with IBA (Indol butyric Acid) and NAA (Naphthalene Acetic Acid) in concentrations of 1500 ppm, 3000 ppm, 4500 ppm and in the variation control without treatment, in substrate turf, turf-perlite 2:1. The results in both types of cuttings show differences of statistical significance (p = 0.05) and (p = 0.01). Bearing in mind that the greatest rooting ability is in special time periods and based on results from several years, propagation with green cuttings did not produce a high percentage of rooting based on the fact that their rooting is difficult and has reached 37.5% whilst semi-hardwood shoots taken at the same time period have reached a higher percentage (42.5%) which is definitely related to the physiological condition of the shoot.

This experiment has been carried out in order to determine the rooting ability of hardwood cuttings of the blueberry cultivar ‘Bluecrop’ collected during the deep dormant winter period in the last part of January. In order to induce the adventitious roots formation, the cuttings were stimulated using Indol Butyric Acid (IBA) and Naphthalene Acetic Acid (NAA) in various concentrations (1500, 3000, 4500 ppm), whilst one row in each box remained intact (control).  The collection of cuttings off the mother plant at the beginning of January enable the nutrients and other matter that help the process of rooting not to move from the base of cutting towards the top and consequently they remain at the base of cutting which results with quite a high rooting percentage (up to 72.5%) compared to the cuttings collected in February with rooting percentage of 67.5% and in March (52%). In both types of substrate, turf and turf-perlite 2:1 and in different time periods when cuttings have been collected, IBA proved to be better in inducing adventitious roots compared to NAA.

The purpose of this research is to determine the impact of the turf-only substrate and turf–perlite in the ratio 2:1 and of growth regulators in the quality of adventive roots ( the number and length) of well lignified one-year old branches without fruit buds in the Bluecrop cultivar (Vaccinium corymbosum L.) taken at the end of the latent period before budding at the February 15 th during the -2015 growing season. In order to support the increase of the number of roots and their length the hardwood cuttings are treated with different IBA and NAA concentrations (1500, 3000, 4500 ppm), while a part of cuttings were untreated control. The number and the length of roots have increased in relation to the increase of concentration from 1500 to 3000 ppm followed by a decline of these values in concentrations over 3000 ppm. Respectively, the number of roots (8) and the higher values of root length (4.6 cm) are achieved in the turf–perlite substrate, IBA 3000 ppm (compared to the turf-only substrate). The presence of perlite helps the aeration of the substrate and supports biochemical and physiological processes which lead to the inducing of adventive roots. Regarding the number and length of roots an important variation for (p<0.05) was observed between different concentrations of IBA and NAA. In general the effect of IBA was a lot better than the effect of NAA.

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