JUGLANS REGIA L. تاثير زمان پيوند و نوع بستر كالوس زايي بر گيرايي پيوندهاي جانبي و زيني در گردوي ايراني

Effects of Date of Grafting and Kind of Callusing Bed on Grafting Success of Side and Saddle Grafting in Persian Walnut (Juglans regia L.)

Two experiments were conducted to find out the best grafting date and best bed system to induce enough callus in grafting union. Both experiments were run in the greenhouse of Department of Horticulture, Faculty of Agriculture, the University of Tehran during year 2001. Two methods of grafting i.e. side-grafting and saddle-grafting were applied in two separate experiments. ln the first experiment, using side-grafting technique, one-year old Persian walnut seedlings with diameter of 2-4 cm were used. In the second experiment, using saddle-grafting technique, thin (1-2 cm.) one year old seedlings were used. ln these experiments, effects of date of grafting (22" December and 22"d January), and kind of callusing bed (hot bed and normal bed without heating system at the bottom) were studied as a factorial in completely randomized design with three replications of 20 plants/ plot. Results showed that in the first experiment, using side-grafting technique, date of grafting had highly significant effect on grafting success in a way that first date was much more successful than the second date. Kind of callusing bed had no significant effect. However, in this experiment, the best result was obtained by grafting at the first date and using hot bed. ln the second experiment, using saddle-grafting technique, first date was more successful than the second date but the differences did not reach significant level. Kind of callusing bed had also no effect.