Author(s):

Ravikant Chandrvavanshi, Dr. G Kar, Dr. HV Puranik, Parshottam Kumar Sinha and Vinod Chandravanshi

Abstract: Energy balance relationship over rice crop using eddy covariance and crop growth modeling was carried out during kharif crop 2016-17 at Deras, IIWM, Bhubaneswar. For the study of weather characterization, weather data were collected from eddy covariance tower at Deras, IIWM Bhubaneswar and energy balance relationship was studied over rice crop. The result of the study showed that the weekly maximum temperature was observed 32.6ºC in 41 SMW week and the minimum was 20.6ºC in 42 SMW. In highest RH was recorded 89% in 38^th SMW. The total amount of rainfall during crop growth period was 380.8 mm. The maximum rainfall 92 mm received during 30^th SMW. Which 42^th SMW was dry. Highest SRAD value was observed 20.2 MJm^-2day^-1 in 33^rd SMW and lowest SRAD value 8.2 MJm^-2day^-1 was observed in 31^st and 35^th SMW. The highest evaporation 11 mm was recorded in 41^st SMW and min 0.2 mm was observed in 30^th SMW. The maximum wind speed 3.9 km/h was recorded in 30^th of week and minimum 1.6 km/h was recorded in 40^th of week. Surface energy balance of rice was observed in every phenological stages at 8.00 h to 17.00 h. Rn was varied between 140.00 W m^-2 to 400.26 W m^-2 and LE was varied between 21.0 W m^-2 to 406.69 W m^-2. Highest value of Rn and LE were found 400.26 W m^-2 and 306.69 W m^-2 were found in transplanting stage and lowest 140.0 W m^-2 and 21.40 W m^-2 were found in before harvesting stage. H was varied between 19.18 W m^-2 to 53.84 W m^-2, where highest 53.84 W m^-2 was found in milking stage and lowest 19.18 W m^-2 was found in before harvesting stage. G was varied between -4.68 W m^-2 to 5.86 W m^-2. G showed negative value in all phenological value except transplanting stage, It was showed positive value (5.86 W m^-2).

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