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Aims: The objectives of the research work were to evaluate the physiological behaviour and yield contributing attributes of rice under different system of cultivation in boro season. Study Design: The experiment was laid out in a randomized complete block design (RCBD) with three replications. Place and Duration of Study: Central research field of Sher-e-Bangla Agricultural University, Dhaka-1207 during November 2015 to May 2016. Methodology: In this research we used three System of cultivation [T1: Low land transplant (anaerobic) condition; T2: Raised upland (aerobic) condition, and T3: Raised transplant (aerobic) condition] and five rice Varieties [V1: BRRI hybrid dhan3; V2:Bolaka; V3: Moina; V4: Gold and V5:BRRI dhan 45], where different morpho-physiological data was taken for evaluation their performance. The significance of the difference among the treatment means were estimated by the Duncan’s Multiple Range Test (DMRT) at 5% level of probability [1]. Results: Among the different system of cultivation significant variation was observed on growth, Original Research Article Islam et al.; ARRB, 36(3): 10-18, 2021; Article no.ARRB.66356 11 yield and yield contributing parameters. All the studied hybrid varieties showed superiority in respect of physiological characters, yield and yield attributes in anaerobic condition over aerobic condition. BRRI hybrid dhan3 provided the highest grain yield (8.05 t ha) at low land transplant condition. BRRI hybrid dhan3 performed well due to yield attributes [amount of chlorophyll (2.47 mg g) in its flag leaves,leaf area index (4.25), shoot reserve translocation (34.97%), grain dry matter accumulated from current photosynthesis (85.87%) , higher filled grains per panicle and 1000 grain weight] than others varieties and the lowest (4.28 t ha -1 ) was obtained from BRRIdhan45 at raised transplant condition. Conclusions: The results showed that Low land transplant condition with BRRI hybrid 3 showed the best performance regarding growth, yield and yield contributing characters of Boro rice varieties than others.

Physiological Behaviour and Yield Contribution of Oryza sativa Under Different Cultivation System in Boro Season