VEGETATIVE PROPAGATION OF ULMUS LAEVIGATA BY STEM CUTTINGS

Cuttings taken from one-year-old branches of 25-year-old trees were tested under nursery conditions to evaluate the effect of auxin, season and cutting portion on the rooting potential of Ulmus laevigata. Maximum rooting (63.3%) was recorded when cuttings prepared from basal portions were treated with 1.5% IBA formulation during winter (February). In the rainy season best rooting was achieved when cuttings from basal portions were treated with 0.5 % NAA + 1.0 % IBA. In rooting characteristics (except mean root length), basal portions in winter and the rainy season were quite effective in enhancing the root quality. Keratan-keratan diambil daripada ranting berumur setahun daripada pokok berumur 25 tahun telah diuji di bawah kondisi tapak semaian untuk menilai kesan auksin, cuaca dan bahagian keratan ke atas potensi pengakaran Ulmus laevigata. Pengakaran maksimum (63.3%) telah direkodkan bila keratan pangkal dirawat dengan 1.5% perumusan IBA pada musim sejuk (Februari). Pada musim hujan pengakaran terbaik telah dicapai apabila keratan di pangkal dirawat dengan 0.5% NAA + 1.0% IBA. Di dalam ciri-ciri pengakaran (kecuali kepanjangan akar min), bahagian pangkal di musim sejuk dan musim hujan agak berkesan di dalam menambah kualiti pengakaran.