Abstract. The effect of Kelpak^® biostimulator, Wuxal^® Ascofol and Pentakeep^®-V leaf fertilizers were tested on Prunus mahaleb L. ‘Bogdány’ stockplants. Shoot production and characteristics, rooting and quality of their cuttings were evaluated. Biostimulator and fertilizers were sprayed four times on leaves before cuttings were taken. The number and fresh masses of the shoots, cutting weights, leaf chlorophyll indexes (SPAD) and indole-3-acetic-acid (IAA) levels in shoot tip were measured on stockplants. Rooting rates, IAA--levels in the rooting zone of cuttings, fresh and dry masses of rooted cuttings, both weights of the root and shoot were measured. Based on these results Kelpak^® pretreatment could be considered as the most effective in improving the productivity of Prunus mahaleb L. stockplants, leaf chlorophyll indexes and IAA-level in shoot tip of stockplant and in cutting base. The stockplant pretreatment by Kelpak^® increased both the single shoot mass and consequently the fresh mass of prepared cuttings. While these pretreatments alone did not affect the rooting rate, the pretreatment of shoots by Kelpak^® and Pentakeep^®-V increased the dry mass production of cuttings during rooting. Kelpak^® pretreatment affected the root dry mass positively, while Pentakeep^®-V increased the shoot dry mass of rooted cuttings.

113-125