Vol. 9, Issue 9 (2020)

Author(s):
Alok Kumar Pandey, SR Mishra, AN Mishra, Arun Kumar, Suraj Kumar, Rakesh Kumar Kushwaha and AK Singh

Abstract:
A field experiment was conducted during Kharif season of 2019 at Student Instructional Farm of A.N.D.U.A. & T, Kumarganj, Ayodhya (U.P.) Studies on accumulated thermal unit, thermal use efficiency of different rice genotypes at different phenological stages. Experiment was conducted with in Randomized Block Design and replicated four times. The treatments comprised of 3 crop growing environment i.e. 5^th July (D₁), 15^th July (D₂) and 25^th July (D₃) with 3 genotypes i.e. NDR-97 (V₁), SARJOO-52 (V₂) and BPT-5204 (V₃). The results revealed that Crop growing environment of 5^th July (D₁) took more days to reach harvest stage in all genotypes. With respect to the heat units viz., growing degree days, photo thermal unit, helio thermal unit, the first growing environment of rice on 5^th July (D₁) is giving more values over after growing environment i.e. 15^th July (D₂) and 25^th July (D₃). Maximum thermal use efficiency (TUE) was recorded in crop growing environment on July 5^th (0.60 g/m²/⁰C days^-1) at milking the stage, followed by July 15^th (0.39g/m²/⁰Cdays^-1) and July 25^th (0.41g/m²/⁰Cdays^-1).