Author(s):

Krishna Murari, Dr. GK Das, Jubli Sahu and Dr. HV Puranik

Abstract: Studies on crop weather relationship in rice were carried out kharif 2016 at Indira Gandhi Krishi Vishwavidyalaya, Raipur Chhattisgarh. Threerice varieties viz. Swarna, Mahamaya and MTU-1010 were grown under irrigated conditions with three dates of sowing viz. and D₁(01June2016), D₂ (15June2016) and D₃ (30 June2016). The cumulative growing degree days at maturity stage were highest (2724) for Swarna fertilized @ 100:60:40 kg NPK^-1and Swarna fertilized @ 60:40:40kg NPK^-1under 01^st June sowing. Maximum growing degree days were observed in early sown crop 1^st June as compared to late sown crop 15^th June and 30^th June. At maturity stage, the maximum helio thermal unit of 13247, 13247, 11122 and 10366 was recorded for varieties Swarna fertilized @ 100:60:40 kg NPK^-1, Swarna 60:40:40, Mahamaya and MTU-1010 respectively sown on 01^st June was recorded. The maximum photo thermal unit of 34283, 34283, 31556 and 28914 was recorded for four varieties viz. Swarna fertilized @ 100:60:40 kg NPK^-1and Swarna fertilized @ 60:40:40kg NPK^-1, Mahamaya and MTU-1010 sown on 01^st June respectively. The highest radiation use efficiency was recorded at maturity stage with MTU-1010 (1.52gMJ^-1) where as the heat use efficiency was higher in D₂ (15^stJune) sowing (0.58g/m²/⁰day). The highest HUE was found in variety Swarna fertilized @ 60:40:40kg NPK^-1 (0.58g/m²/⁰day).

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