Effect of Different Growth Regulators on the Rooting of Hardwood Cuttings of Bougainvillea glabra var. “Mohan”

The Bougainvillaea plant is a common climber and shrub, and one of the most difficult tasks for its growers is cutting roots. The present study employed three different kinds of auxin to root the cuttings. Bougainvillaea, a popular decorative plant, is generally propagated by cuttings and tissue culture. However, large-scale cultivation of Bougainvillaea is sometimes problematic due to roots concerns. An experiment about the effect of different growth regulators on the rooting of hardwood cuttings of Bougainvillea glabra var. 'Mohan'" was conducted during the year 2020-21 at the Faculty of Horticulture, Bidhan Chandra Krishi Vidyalaya, Mohanpur, Nadia, West Bengal, India. The study employed a completely randomized design with ten treatments (T1: IAA @500ppm, T2: IAA @1000ppm, T3: IAA @1500ppm, T4; IBA @500ppm, T5: IBA @1000ppm, T6: IBA @1500ppm, T7: NAA @500ppm, T8: NAA @1000ppm, T9: NAA: 1500ppm & T10: control), 210 hardwood cuttings of Bougainvillaea var. "Mohan" were made, and fungicide was applied before planting. Black polythene was placed beneath the bed for quicker roots. IAA, IBA, and NAA solutions were created using distilled water. Cuttings were treated with growth regulator and planted in beds., each replicated three times. The findings of this investigation revealed that among the various concentrations of IAA- Indole acetic acid, IBA- Indole-3-butyric acid, and NAA- Naphthalene acetic acid, hardwood cuttings treated with IAA at 1500 ppm exhibited the earliest bud initiation (7 days). The best result for the first root initiation (7 days) was observed with IAA at 1000 ppm. IBA at 1500 ppm resulted in the highest number of leaves per cutting (25), while IBA at 1000 ppm produced the highest number of buds per cutting (4). Furthermore, the highest number of roots (9.2) and the greatest average root length (8.7 cm) were achieved with IBA at 1500 ppm. From the foregoing discussion and summary, it can be concluded that efficient management of IBA in higher concentration i.e. 1500 ppm gave the best result in rooting of Hardwood cuttings of Bougainvillea var. “Mohan” for better rooting.