Effect of paclobutrazol and B-nine on morphological development of Primula malacoides Franch

An experiment was conducted at the experimental farm of department of Floriculture and Landscape Architecture, Dr YS Parmar University of Horticulture and Forestry, Nauni, Solan, HP from September 2012 to March 2013 with the objective to study the effect of B-nine and paclobutrazol on vegetative growth of Primula. The experiment was laid out in a completely randomized design consisting of 19 treatments replicated thrice each having 5 pots. Rooted seedlings were planted in pots of 6 inch size containing sterilized potting mixture of sand/soil/vermicompost in equal ratio. Paclobutrazol (10, 15 and 20 ppm) and B-nine (500, 1000 and 1500 ppm) were sprayed on rooted seedlings at 8–10 cm height. All the paclobutrazol treated plants resulted in reduced plant spread, inter-nodal length, leaf colour and number of leaves per plant whereas B-nine treated plants resulted in reduced plant height.