Light response of soybean (Glycine max (L.) merr. cv. Doi Kham)
1989
Siri Parayart
November 1986 to September 1987, at the nursery of Botany Department, Faculty of Science. Kasetsart University, Bangkhen Campus. The soybean seedlings with first true leaves were treated with different light periods: 10.00, 10.30, 11.00, 11.30, 12.00, 12.30, 13.00, 13.30, 14.00 and 14.30 light hours and each light hour was repeated with 5, 10, 15, 20 and 25 inductive cycles. The plants were kept in the daylength of 16 hours throughout the experiment. The longer daylength, the vegetative phase, flowering period and number of flowers per plant were increased. The peak number of pods per plant was at 11.30 hrs light period. The soybean plant growing in 16 hours daylength gave the highest number of flowers but no pod set. On night interruption period with fluorescent light for 15 min, 30 min, 60 min and 120 min of during 11.00 pm-01.00 am and each night interruption period was repeated with 5, 10, 15, 20 and 25 inductive cycles. The plants were kept in natural daylength. The vegetative growth, number of flowers per plant and number of pods per plant were increased along with the longer period of night interruption. Night interruption with 60 or 120 minutes light period gave highest number of flowers and pods per plant.
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