
Rice is staple food for more than 50% of world population. Nitrogen is
one of the most yield limiting nutrients for lowland rice production around the
world. Two field experiments were conducted at two locations for two
consecutive years to evaluate nitrogen use efficiency of 12 lowland rice
genotypes. Growth, grain yield and yield components were significantly
influenced by nitrogen as well as genotype treatments. Location X year X
genotype and location X year X nitrogen interactions were significant for most
of the growth, yield and yield components, indicating influence of these
factors on yield and yield components. Overall, most N efficient genotypes
measured in terms of grain yield were BRA 031032, BRA 031044 and BRA 02654 and
most inefficient genotypes were BRS Ja�ana, BRS Fronteira and BRA 02674.
Genotypes were having linear and quadratic responses to added N in the range of
0 to
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