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 D
1(01June2016), D
2 (15June2016) and D
3 (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 D
2 (15
stJune) sowing (0.58g/m
2/
0day). The highest HUE was found in variety Swarna fertilized @ 60:40:40kg NPK
-1 (0.58g/m
2/
0day).