Vol. 11, Issue 12 (2022)

Author(s):
Mundhe SG, Lalu Das and Thakur S

Abstract:
Interception of photosynthetically active radiation (PAR) by the rice crop at different phenophases is important for growth and yield variation through radiation utilization by the crop. Identification of intercepted PAR at a particular time point is necessary for understanding the role of PAR. An experiment on boro rice the cultivar Shatabdi, Heera and Triguna was conducted at ‘D’ block farm, B.C.K.V, West Bengal, India. The 32 days age of seedling and 25 days age of seedling were transplanted on 27th January 2017-18 and 2018-19. The intercepted PAR was measured at 11:30hr morning at taken observation from tiller initiation, tillering, panicle initiation, panicle, flowering, milk and physiological maturity. The dry matter, yield and PAR use efficiency were estimated. The age of seedling 25 days reduced the dry matter. The PAR use efficiency ranged from 2.57 to 5.10 MJ^-1 in 32 days age of seedling with Triguna variety. The yield attributes and grain yield were reduced 25 days age of seedling with Heera variety. The PAR use efficiency for grain production was drastically reduced 25 days age of seedling with Heera variety. The interception of PAR at 11:30hr had significant contribution for dry matter and grain yield of boro rice in the new alluvial zone of West Bengal. It was using appropriate and proper age of seedling i.e. 32 days age of seedling ideal and suitable for transplanting.