Effect of planting dates and indole-butyric acid on rooting of Beaumontia Grandiflora Wallich. cuttings and consequent plant growth [electronic resource].

Includes references.

This study was conducted in a glasshouse at the Experimental Nursery of the Ornamental Horticulture Department, Faculty of Agriculture, Cairo University. The study included two experiments. The first experiment was carried out during the 199912000 and 2000/200I seasons, with the aim of investigating the effect of different planting dates on the rooting ofBeaumontia grandiflora Wallich. cuttings, as well as consequent plant growth and chemical composition. Semihardwood stem cuttings (IS em long, defoliated, with 3 nodes) were planted on 2lit March, 2 lit June, 2 lit September and 2 lit December. Results recorded 4 months after each planCng date showed that - Planting the cuttings in March gave the highest rooting percentage, the highest vegetative growth of the resulting plants (in terms of plant height, nwnber of leaves, as well as the fresh and dry weights of leaves and stems/plant). The highest total carbohydrates content, CJN ratio and total soluble indoles content, as well as the lowest total soluble phenols conteDl were recorded in the cuttings planted in March, whether before planting or in the basal parts ofcuttings after 30 days from planting. Moreover, plants formed on cuttings planted in March had the highest total carbohydrates cootenlin the leaves, compared to plants formed on cuttings planted on other dares. Planting in March or lunegave the best root growth in tenus of root length. number of rootslplant,aswell asthetieshand dry weights of roots/plant. • A positive relation was recorded between seasonal variations in the CIN ratio and the rooting percentage of cuttings, i.e. planting dates at which the cuttings had a high CIN ratio also gave a high rooting percentage. The second experiment was conducted during the 200 I and 2002 seasons, with the aim of investigating the feasibility of using IBA for improving the rooting of cuttings planted in March, as well as the subsequent vegetative plant growth and chemical composition. The bases of the cuttings taken in March were immersed in an IBA solution at concentrations of0 (control), 1000, 2000, 3000 and 4000 ppm for 10 seconds prior to planting.

Summary in Arabic.

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