2024, Vol. 7, Issue 11, Part H

author(s)
Madanmohan Meena, Joydeep Mukherjee, P Krishnan, VK Sehgal and DK Das

abstract
A field experiments were conducted in a Temperature Gradient Tunnel (TGT) at the MB-4C farm of ICAR-Indian Agricultural Research Institute, New Delhi, during 2019 and 2020, focusing on rice crops. This study aimed to evaluate the impact of varying temperature conditions and nutrient treatments on the photosynthetic performance of rice at different growth stages, including tillering, panicle initiation, booting, flowering, and ripening. The results revealed significant variations in photosynthetic rates, with maximum values observed in treatments with higher nutrient levels (N₁V₆, N₁V₄) and minimum rates in nutrient-deficient conditions (N₀V₂, N₀V₁). Notably, treatment N₁V₆ consistently exhibited the highest photosynthetic rates across all growth stages. Additionally, the investigation of chlorophyll content (chl a+b) across various treatments N₁V₃ had the highest values at all growth stages, while N₀V₁ recorded the lowest. Overall, the findings underscore the critical role of temperature and nutrient management in optimizing photosynthetic efficiency and enhancing rice productivity in the face of changing climatic conditions.