Effect of pinching and gibberellic acid on growth, flowering and yield of African marigold (Tagetes erecta L.) under different seasons
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Date
2017
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CCSHAU
Abstract
The present experiment entitled “Effect of pinching and gibberellic acid on growth, flowering and
yield of African marigold (Tagetes erecta L.)” under different seasons was conducted at Experimental Orchard
of Department of Horticulture, CCS Haryana Agricultural University, Hisar during the crop season of 2015-16.
Treatments comprised of four levels each of pinching (P1 - No pinching, P2 - Pinching at 2 WAT, P3- Pinching at 3
WAT and P4 - Pinching at 4 WAT) and gibberellic acid (G0 - Control, G1 - 150 ppm, G2 - 250 ppm and G3 - 350
ppm) with two different seasons i.e. winter and summer. This experiment comprising sixteen treatments in each
season was laid out as factorial Randomized Block Design with three replications. Five competitive plants were
randomly selected from each treatment to record data on growth, flowering, flower yield and seed parameters.
Statistical analysis of data revealed that application of GA3 250 ppm on plants pinched at two weeks after
transplanting showed better results in terms of growth, flowering and yield of African marigold.
In summer season, maximum fresh & dry weight of plant, number of buds and flowers per plant and
seedling shoot length was observed with application of GA3 250 ppm and pinching at 2 week after transplanting
while, maximum flower yield, 1000 seeds weight, seed yield, seed germination, seedling root length, seedling dry
weight and seed vigour-I&II observed in winter season. It was also recorded that earliest appearance of 1st flower
was observed in un-pinched plants sprayed with GA3 350 ppm during summer season, however, earliest bud
initiation, maximum flower diameter, duration of flowering, fresh & dry weight of flower, number of seeds and
number of black seeds per capitulum were recorded in un-pinched plants of winter season.
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