Studies on accumulated thermal unit and thermal use efficiency at different phenophases of rice varieties under different crop growing environment

Abstract

A field experiment was conducted during kharif season of 2018 entitled “Studies on accumulated thermal unit and thermal use efficiency at different phenophases of rice varieties under different crop growing environment” at N.D. University of Agriculture and Technology, Kumarganj, Ayodhya (U.P.). The experiment consisted of nine treatment combinations viz. three crop growing environment viz. July 15th, July 25th and August 04th and three varieties viz., NDR-97, NDR-2064 and BPT-5204. Results reveal that maximum accumulated thermal unit (2203.1°C days) was recorded in crop growing environment of July 15th followed by the July 25th (2089.8°C days). Among the varieties, maximum accumulated thermal unit in variety BPT-5204 (2367.2°C days) followed by NDR-2064 (2113.7°C days). Maximum thermal use efficiency of (0.51g/m2/°C days) was recorded in July 15th at Physiological Maturity followed by July 25th (0.475g/m2/°C days). NDR-2064 possess maximum TUE of 0.535g/m2/°C days at Physiological Maturity followed by BPT-5204 (0.505g/m2/°C days).