Pak. J. Bot., 43(3): 1485-1490, 2011. | Back to Contents | ||||
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Updated: 18-06-11 | ||||
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EFFECTS OF DIFFERENT PHOTOPERIODS ON FLOWERING TIME OF QUALITATIVE LONG
DAY ORNAMENTAL ANNUALS
Abstract: Present study was
carried out at the Agricultural Research Institute, Dera Ismail Khan,
Pakistan, during the year 2005. Seeds of five qualitative LDPs (Pot
Marigold cv. Resina, Annual Phlox cv. Astoria Magenta, Cornflower cv.
Florence Blue, Oriental Poppy cv. Burning Heart, Flax cv. Scarlet Flax)
were sown on 1st March 2005. The experiment was designed to
study flowering response under four distinct controlled photoperiods
(11, 13, 15 and 17 h.d-1). A curvilinear qualitative response
was observed in almost all cultivars studied. Pot Marigold, Annual
Phlox, Cornflower, Oriental Poppy and Flax took minimum time to flower
when grown under 17 h.d-1 photoperiods however it was
significantly (p<0.05) increased when photoperiod decreased to 11 h.d-1. *Corresponding author: jalaluddinbaloch@live.com |
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