EFFECT OF PACLOBUTRAZOL AND B-NINE ON GROWTH, FLOWERING AND PRESENTABILITY OF Primula malacoides Franch.
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Date
2013
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ABSTRACT
Present investigations were carried out at the experimental farm Department of
Floriculture and Landscaping, Dr, Y S Parmar University of Horticulture and
Forestry, Nauni, Solan (HP) from September, 2012 to March, 2013 with the objective
to study the “Effect of paclobutrazol and B-nine on growth, flowering and
Presentabilty of Primula malacoides Franch.”. The experiment was laid out in a
Completely Randomized Design, consisting of 19 treatments, replicated thrice and
each replication having 10 pots. Rooted seedlings were planted in pots of 6 inch size
and sprayed with paclobutrazol (10 ppm, 15 ppm and 20 ppm) and B-nine (500 ppm,
1000 ppm and 1500 ppm). Sprays were further applied in single, double and triple
applications and single spray was done 30 days after transplanting, double spray; 45
& 90 days where as triple spray was applied at the interval of 30, 60 & 90 days after
transplanting. Among all the treatments, paclobutrazol when applied as triple spray @
5ppm each (T6) resulted in increased plant spread, number of leaves, delayed
flowering, decreased number of inflorescence open per plant and per week, internodal
length and inflorescence stalk length, enhanced leaf colour, vase life, duration of
flowering. Whereas, B-nine treated plants resulted in decreased plant height. The
presentability of plants increased in all the paclobutrazol treated plants as compared to
control. However, the most presentable pots were obtained when the plants were
sprayed with a triple application ofpaclobutrazol (@ 5 ppm each spray).