Abstract
Field experiment was carried out during kharif season of 2012 at Research and Instructional Farm of Indira Gandhi Agricultural University, Raipur to examine yield and Heat unit requirement of rice with three genotypes as influenced by three sowing dates in factorial Randomized Block Design. Higher grain yield was recorded with Mahamaya as compared to Karma Mahsuri and MTU-1010 under 10th June sowing also with respect to heat units the cumulative growing degree day at maturity stage was (2410˚C) for Karma Mahsuri followed by Mahamaya (2365˚C) and MTU-1010 (2161˚C) when sown on 10th June. Maximum growing degree days were observed in early sown crop (10June) as compared to late sown crop (20 and 30June). Similar results were found in the case of photo thermal unit and helio thermal unit also. At maturity stage, highest radiation use efficiency in 10th June sowing might be due to better conversion of light in to dry matter, better yield component and harvest index in 10th June sowing as compared to 30th June sowing.
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