STUDIES ON PROPAGATION AND SUMMER PRODUCTION OF AFRICAN MARIGOLD (Tagetes erecta L.) CV. BIDHAN MARIGOLD - 2
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Date
2019-02-15
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COLLEGE OF HORTICULTURE VENKATARAMANNAGUDEM - 534 101, WEST GODAVARI DISTRICT Dr. Y.S.R. HORTICULTURAL UNIVERSITY
Abstract
The present investigation entitled “Studies on propagation and summer
production of African marigold (Tagetes erecta Linn.) cv. Bidhan Marigold – 2”
was carried out at Horticultural Research Station, Venkataramannagudem, West
Godavari District of Andhra Pradesh during summer,2017 and 2018. The
investigation was composed of three major components viz., propagation of
terminal stem cuttings with various media and hormonal solutions, effect of
spacing, SNP concentration and nitrogen source on heat stress, effect of pre
harvest sprays of PGRs on heat stress. Propagation of Bidhan Marigold-2
terminal cuttings revealed that among media cocopeat was best followed by
vermiculite and sand whereas among the various hormonal treatments, IBA @
3000 ppm in powder form was found to be the best followed by IBA @ 1500
ppm in powder form and the least with no hormonal treatment for various root
and shoot parameters. Among the interaction effects IBA @ 3000 ppm in powder
form with cocopeat medium was the best in inducing the highest number of total
roots (186.25), primary roots (12.65), secondary roots (123.5), longest root (5.78
cm), fresh and dry weight of roots (1.87g and 0.62 g respectively) along with
highest percentage of rooted cuttings (98.00%), survival percentage of rooted
cuttings (97.96%) and percentage establishment of rooted cuttings (97.92%).
Regarding the shoot parameters NAA @ 200 ppm in cocopeat medium recorded
the maximum shoot length (23.49 cm) and number of leaves (197.55) followed
by IBA @ 200 ppm with. The lowest values for all the root and shoot parameters
recorded were obtained in sand medium without any hormonal treatments.
The second part of investigation was composed of the evaluation of
different spacings, SNP concentration and nitrogen source on inducing heat
tolerance for better plant growth and flower production at higher temperatures.
Among various spacings followed, 60 x 30 cm was found to be the best in terms
of individual plant performance whereas the highest yield ha-1 was found to be
higher in narrow spacing of 45 x 30 cm. Among the SNP concentrations, 200 µM
was found to be the best followed by 100 µM for various vegetative, floral, yield
and quality parameters recorded. Application of nitrogen in the form of calcium
nitrate was superior in terms of growth and yield followed by ammonium
sulphate and urea whereas in terms of BCR ammonium sulphate was found to be
superior followed by urea and calcium nitrate. Among the interaction effects the
highest flower yield was recorded with application of calcium nitrate and 200
µM SNP spray twice at narrow spacing of 45 x 30 cm (185.198 q ha-1
) followed
by application of ammonium sulphate and 200 µM SNP spray twice at narrow
spacing of 45 x 30 cm (169.299 q ha-1
). Lowest yield was observed with
application of urea and 0 µM SNP i.e. water spray twice at narrow spacing of 45
x 30 cm (169.299 q ha-1
). The higher cost of Ca(NO3)2 was non compensative
compared to (NH4)2SO4 pushing down the treatment combinations with
Ca(NO3)2 in the present study.
In the third part of investigation, evaluation of certain plant growth
regulating chemicals against heat stress was analysed for better plant growth and
yeild during summer. Among growth regulators (GA3, SA, Ca(NO3)2, KNO3, 28
HBL) maximum flower diameter of 4.35 cm was recorded with SA 200 ppm
while minimum of 3.71 cm was observed in the control. The maximum ten
flower weight was registered with SA 200 ppm (44.57 g) as against 32.73 g in
control plots. Plants sprayed with SA 200 ppm produced highest flower yield
(158.39 q h
-1
) followed by KNO3 2% (141.52 q h
-1
) whereas the untreated
(control) plots yielded 99.13 q h
-1.
Description
1. To study the influence of different media on rooting of stem cuttings in
marigold cv. Bidhan Marigold-2.
2. To study the influence of different hormones on rooting of marigold cv.
Bidhan Marigold-2 cuttings kept under mist chamber conditions.
3. To identify the optimum spacing for summer cultivation of marigold cv.
Bidhan Marigold-2 grown under coastal districts of Andhra Pradesh.
4. To standardize the optimum dose of nitric oxide to tolerate the heat stress
conditions in marigold cv. Bidhan Marigold-2 grown during summer
season..
5. To identify the best source of nitrogenous fertilizer to be applied to
marigold cv. Bidhan Marigold-2 grown during summer season.
6. To study the influence of chemicals / growth regulators on plant growth
and flower yield of marigold cv. Bidhan Marigold-2 grown during
summer season.