Introduction:Flowering duration of rice as defined in terms of the number of days that elapses from the date of the date of flowering,is an important varietal character thoughwith wide variations:some of the cultivated rices mature within 50days while the longest of them takes well over 150 days from sowing to flowering.It is observed that earliness and lateness constitute a pair of contrasting heritable characters, their behaviour in mheritance being simple or complex according to the genetic make-up of the parents involved.While this is true of the varieties native to a tract,instances are commonly found of varieties changing their duration when introduced into another tract with differing climatic conditions.Ramiah(1927)has recorded some outstanding examples of such changes in duration in the Province of Madras as also cases i climatic environment.
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Tamil Nadu Agricultural University
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