Vol. 12, Issue 9 (2023)

Author(s):
Mundhe SG, Das L, Thakur S and G Saha

Abstract:
To investigate how the different agro-climatic factors impacted on growth and development of boro rice at different phenological stages in addition to assessing the variability of final yield due to variation of spacing, varieties and age of seedling, a field experiment was conducted during boro seasons of 2017-18 and 2018-19 hereafter known as 2018 and 2019 respectively at the District Seed Farm (D bl °C k farm) of Bidhan Chandra Krishi Viswavidyalaya, at Kalyani in Nadia district. The experiment was laid out in factorial randomized bl °C k design (FRBD) with three varieties, three spacing and two ages of seedlings with two replications. The present study observed that the barometric characters of boro rice are highly influenced by the varieties, spacing and age of seedling. Triguna variety is found to have higher grain and straw yield, whereas the lowest grain and straw yield were found in Heera variety. The wider spacing of 20 cm x 15 cm produced higher grain and straw yield and while the closer spacing of 15 cm x 15 cm reproduced the lowest grain and straw yield. The 32 days age of seedling is found to achieve higher grain and straw yield as compared to 25 days age of seedling. The amount of energy utilized in various phenological phases by the crops was assessed on the basis of accumulated GDD, HTU, and PTU. The result indicates that the Triguna variety consumed more GDD, HTU and PTU at 25 days age of seedling compared to 32 days age of seedling. The highest grain yield by 6020 and 6294 (Kg ha^-1) was observed for Triguna variety and maximum grain yield of 5254 and 5647 (Kg ha^-1) for wider spacing of 20 cm x 15 cm while significant highest yield of 5454 and 5647 (Kg ha^-1) for 32 days age of seedlings was achieved in case of two consecutive growing seasons namely 2018 and 2019, respectively. It was also revealed that the maximum significant straw yields by 8194 and 8432 (Kg ha^-1) for Triguna variety, by 7153 and 7285 (Kg ha^-1) for wider spacing and by 7247 and 7356 (Kg ha^-1) for 32 days age of seedlings was also produced at physiological maturity stage in year 2018 and 2019 respectively. It is concluded that duration of different phenological stages slightly by 2-3 days which may alter different productivity in different cropping seasons as energy utilize in terms of GDD, HTU and PTU changes significantly at different phenol-logical stages.