Abstract
A field experiment was conducted to study the genetic variation for nitrogen use efficiency and yield related traits in nine crosses of rice genotypes. Based on the nitrogen use efficiency and yield performance, six rice genotypes viz., MTU-1001, WGL-2395, MTU-1010, Pothana, Bhadrakali and JGL-1798 were selected and nine crosses were made. From each cross six generations i.e., P1, P2, F1, F2, B1 and B2 were generated and analyzed in an experimental trial conducted in rabi, 2012-13. Hybrids showed superior performance. Among the crosses, MTU-1001 X JGL-1798 followed by MTU-1010 X JGL-1798 recorded maximum SCMR values, photosynthetic rate, nitrogen use efficiency and grain yield. The cultivars with high uptake efficiency had higher nitrogen contents than cultivars with low uptake efficiency from nitrogen application. Therefore, selection of hybrids with high uptake efficiency could reduce the losses of nitrogen and facilitates increased nitrogen uptake and yield.
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