STUDIES ON EFFECT OF PINCHING AND GROWTH REGULATORS ON GROWTH, FLOWERING AND YIELD OF AFRICAN MARIGOLD (Tagetes erecta L.) cv PUSA NARANGI GAINDA
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Date
2014
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Indira Gandhi Krishi Vishwavidyalaya, Raipur
Abstract
The experiment entitled “Studies on effect of pinching and growth regulators
on growth, flowering and yield of African marigold (Tagetes erecta L.) cv. Pusa
Narangi Gainda” was carried out at Horticulture Research and Instructional Farm,
Department of Horticulture, Indira Gandhi Krishi Vishwavidyalaya, Raipur (C.G.)
during Rabi seasons of 2012-13 and 2013-14. The experiment was laid out in
Randomized Block Design (Factorial) with three replications comprising 18
treatment combinations of three plant growth regulators viz., GA3 (100 ppm and 200
ppm), NAA (25 ppm and 50 ppm) and Ethrel (500 ppm and 800 ppm) and three
pinching levels viz., no pinching, single pinching and double pinching in African
marigold (Tagetes erecta L.) cv. Pusa Narangi Gainda.
The result indicated that the important growth characters were significantly
influenced by different plant growth regulator and pinching treatments tried under
this investigation. The application of GA3 (200 ppm) recorded significantly higher
plant height, plant spread, stem diameter, number of primary and secondary
branches, chlorophyll content of leaves, fresh and dry weight of plant at harvest. The
results revealed that among the pinching treatments, double pinching recorded
significantly higher plant spread, stem diameter, number of primary and secondary
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branches, chlorophyll content of leaves, fresh and dry weight of plant at harvest,
whereas plant height and flower size was found maximum with no pinching.
As far as flowering characters are concerned, days to bud appearance, first
flowering and 50 per cent flowering were significantly reduced by the application of
GA3 at 200 ppm. Period of bloom, flower diameter, fresh and dry weight of flower
per plant and flower yield was also improved with the application of 200 ppm GA3.
Among the pinching treatments, double pinching recorded maximum period of
bloom, number of flowers, shelf life of loose flower, fresh and dry weight of flower
per plant and flower yield followed by single pinching. However, maximum flower
diameter was noticed with no pinching.
Seed yield characters viz., 1000 seed weight and seed yield per plant, per plot
and per ha were increased considerably with GA3 at 200 ppm. Among the pinching
treatments, maximum 1000 seed weight and seed yield per plant, per plot per ha
were obtained under double pinching.
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Keywords
pruning, developmental stages, planting, biological development, plant growth substances, yields, thinning, auxins, sowing, drying