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Studies on Photoperiodic Response in the Expansion of Blooming Period in Garden Chrysanthemum

(Chrysanthemum morifolium Ramat)

V N Gupta, B K Banerji & S K Datta Floriculture Section

National Botanical Research Institute, Lucknow - 226 001 (U P)

Abstract Experiments were conducted at Floriculture Section of National Botanical Research Institute, Lucknow to study the photoperiodic response in the expansion of blooming period in Chrysanthemum morifolium Ramal. Thirty five cultivars were tested for their response to photoperiod by subjecting them to artificially created short- day (shading from 5 pm to 7 am) and long -day (additional lighting from 10 pm to 2 am). Ten of them were found to be sensitive, since short days hastened the blooming through extended night length while long-day treatment delayed it in all the 25 varieties. Maximum hastening 15 days was recorded in cv. 'Kundan' and 'Vijai' through extended night length (short days) from the normal blooming period and the plant exposed to extended day length (long day) for 30 days. Maximum delay in blooming (26 days) was absent in cv 'Sasant Bahar'. It is concluded that flowering in Chrysanthemum can easily be extended by the use of simple lighting and black out system not requiring temperature control.

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