Vol. 10, Issue 7 (2021)

Author(s):
Sudharani JS, Sreedhar C, Chandramohan Y and Madhukar Rao

Abstract:
Effect of nitrogen (N) levels on yield and yield components of rice cultivars was investigated in an experiment as split plot design with three replications in a paddy at Regional Agricultural Research Station, Jagtial, Karimnagar district of Telangana state in India. During kharif 2010 and 2011. Four rice varieties viz; JGL 17004 (Pradhymna), JGL 13545, JGL -11118(Anjana) and JGL-11727 (Pranahitha) were tested as pre released cultures for their response to graded levels of nitrogen viz; 100% RDN (100 kg recommended dose of nitrogen per ha), 125% RDN, 150% RDN and 175% RDN. Results showed that 175%RDN recorded significantly superior grain yield (5039 Kg/ha) over100% & 125% RDN, that was 11.5 %, 8.4 % and 1.5% higher over 100 % RDN, 125% RDN and 150% RDN respectively. While 150% RDN recoded comparable yield (4960 kg /ha) with 175% RDN. Among the varieties JGL 11727 & JGL13595 were found superior, recorded the grain yield of 5347 kg/ha & 5345 kg/ha, The regression pertaining to quadratic functions are highly significant. Further, the regression for the quadratic term N was positive in all the cases suggesting that grain yield increased quadratically. From initial increments of this input. But, the negative second power regression coefficient (N)² suggested that the grain yield increased at diminishing rate at higher levels of Nitrogen.