Propagation of Ornamental Plants
13(4): 149-153, 2013
THE EFFECT OF THE FERTILISATION SCHEDULE DURING THE PROPAGATION PERIOD OF THE WITCH-HAZEL (HAMAMELIS MOLLIS OLIV. EX FORB. & HEMSL.) ON THE SUCROSE PROFILE: THE RELATION WITH HARDENING
Gregor Osterc* and Franci Štampar
University of Ljubljana, Biotechnical Faculty, Chair for Fruit Growing, Viticulture and Vegetable Growing, 101 Jamnikarjeva str., 1000 Ljubljana, Slovenia,
*Fax: +386-1-4201088, *E-mail: email@example.com
The problem of the first overwintering of freshly rooted cuttings is a serious one in many woody species, and in various witch-hazel species. The fertilisation strategy which affects the hardening of cuttings is very important. Cuttings of Hamamelis mollis Oliv. ex Forb. & Hemsl. were cut in the middle of June 2009 in Ljubljana on 20 years old stockplants and were immediately inserted in the peat : sand mixture (1:1; v/v). Different fertiliser strategies were conducted. Beside the control variant (no fertiliser was added), additionally three fertilised variants were studied. Cuttings were inserted in four replicates in each fertiliser variant. The experiment was set in an unheated plastic house with the fog system. The sucrose accumulation in cuttings and leaves was different during the propagation period. The lowest sucrose amounts, between 0.2 and 0.3 mg g-1 fresh weight (FW) were measured in cuttings and leaves in August and the highest, between 0.4 and 0.85 mg g-1 FW in cuttings and leaves toward the end of the propagation season, in September and October. There were no significant differences in sucrose concentration among fertiliser variants. Rooting success before and after the winter period differed considerably, between 50 and 95% especially in the control variant; it was more uniform in all fertilised variants, reaching average values around 80%.
Key words: leafy cuttings, substrate, winter surviving