INFLUENCE OF PLANT GROWTH REGULATORS ON ROOTING AND SURVIVAL OF STEM CUTTINGS OF CHINA ROSE AND BOUGAINVILLEA

Abstract

The experiment was conducted at the Germplasm center of Horticulture farm of Sher-eBangla

Agricultural University (SAU), Sher-e-Bangla Nagar, Dhaka-1207, Bangladesh to evaluate the influence of plant growth regulators on rooting and survival of stem cuttings of china rose and bougainvillea during the period from June 2021 to March 2022. The duration of the experiment was 5 ii th June to,2021 to 5 th September,2021 in rainy season and 15 th December, 2021 to 15 th March, 2022 in winter season. The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. Three treatments, viz. G 0 = Control (treated with water), G 1 = Equally mixed Indole Butyric Acid (IBA) @125ppm and Naphthalene Acetic Acid (NAA) @ 125 ppm, G 2 = Equally mixed Indole Butyric Acid (IBA) @250 ppm and Naphthalene Acetic Acid (NAA) @250 ppm were included in this study. In the case of different treatments performance, G 2 showed best performance in terms of days to shoot initiation, number of roots per cutting, length of roots (cm), rooting percentage, shooting percentage, number of shoots per cutting, number of branches, shoot Length (cm), number of leaves, sprouting percentage and survival percentage of China rose and Bougainvillea cuttings. G 2 showed best performance in bougainvillea in terms of rooting percentage in winter season 71.26% and in rainy season 86.74% and survival percentage in winter season 76.67% and in rainy season 85.20%. G 2 showed best performance in china rose in terms of rooting percentage in winter season 74.77% and in rainy season 89.50% and survival percentage in winter season 73.33% and in rainy season 92.36%. In comparison to rainy and winter season, plant growth regulators on rooting and survival of china rose and bougainvillea has found superior result in rainy season. Cuttings also established in winter with the help of plant growth regulators. From the study, it may be concluded that treatment G 2 has more efficacy among different treatments for the influence of plant growth regulators on rooting and survival of stem cuttings of china rose and bougainvillea which was followed by G 1