Vol. 12, Issue 12 (2023)

Author(s):
Nagesha BV, Ramesh Thatikunta, S Narender Reddy, L Krishna and K Supriya

Abstract:
A field experiment was conducted during Rabi, 2019 at College of Agriculture, Rajendranagar, Hyderabad to study the effect of different nitrogen levels and zinc application on growth and development in paddy. The experiment was laid out in split plot design with three varieties as main plots, six nutrient levels as sub plots and replicated thrice. Among the varieties Tella Hamsa had taken less number of days to panicle initiation (64), flowering (83) and maturity (118), Minimum LAI (4.06, 4.43 and 2.44 at vegetative, flowering and grain filling stage respectively) and lower photosynthetic rate (16.7, 19.4 and 12.2 μmol CO₂ m^-2 s^-1 at vegetative, flowering and grain filling stage respectively). Telangana Sona had taken more number of days to panicle initiation (67), flowering (87) and maturity (123), maximum LAI, maximum photosynthetic rate, number of panicles m^-2, Panicle length, grains panicle^-1 and higher grain yield. Application of 25% higher than RDN + 0.5% ZnSO₄ foliar spray resulted in maximum LAI, maximum photosynthetic rate, panicles m^-2, grains panicle^-1, Panicle length and grain yield.