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Journal of Agronomy

Year: 2004  |  Volume: 3  |  Issue: 2  |  Page No.: 90 - 93

Effect of Planting Dates on Phenological Events of Transplanted Aman Rice

K.P. Halder, S.M.A. Sattar, M.S. Islam and M.J.U. Chowdhury


Due to late planting the panicle initiation, heading and maturity of all the cultivars were slowed with decreasing air temperature and solar radiation. Nizersail and BR11 did not complete flower beyond October 01 and September 01 planting, respectively while BR11 completed flowering in all the planting dates. An average temperature 23.92, 26.17 and 21.31°C for 10 days after start of heading was required for Nizersail, BR11 and BR22, respectively. Eighty three to 94% tillers of Nizersail produced fully exserted panicles upto October 01 planting while for BR11 it was 21-92% upto September 15 planting but in BR22 it was about 86-97% in all planting dates. Full panicle exsertion of Nizersail sharply increased with increasing temperature sum for 10 days from start of heading, later slightly decreased but it was sharply increased in BR11. The BR22 was less sensitive to temperature. The percent panicle exsertion was highly correlated with temperature sum for 1-10 days after start of heading for Nizersail (r = 0.87**) and BR22 (r = 0.96**). In BR11, it was highly correlated with temperature sum for 1-10, 11-20, 21-30 and 11-30, days from start of heading and the corresponding values were (r = 0.97**), (r = 0.95**), (r = 0.81*), (r = 0.90**), respectively.

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