Genetic variation in promising rice genotypes for sodicity tolerance
Twenty promising salt tolerant genotypes were evaluated in situ at Faizabad for estimation of the genetic variation of associated characters. The magnitude of difference between genotypic coefficient of variation and phenotypic coefficient of variation was relatively low for all the traits except sterile grains panicle-1, biomass hill-1 and panicle bearing tillers plant-1. High broad sense heritability with high genetic advance in per cent of mean were recorded for single panicle weight hill-1, panicle bearing tillers hill-1 and plant height suggesting the preponderance of additive gene action in the inheritance. Grain yield showed significant positive correlation with biomass hill-1, single panicle weight, fertile grains panicle-1 and 100–grain weight. Hence, these traits should be given more emphasis while selecting genotype for yield improvement in rice for sodicity tolerance. On the basis of the above morpho-economic traits five genotypes which showed stable performance over two consecutive years were IR 65199-4B-10-1-2, CSR 23, IR 67519-3R-994-2B-2, IR 66946-3R178-1-1, and NDRK 50007 even though the rainfall varied from 536- 820 mm during the two years showing large variability in environmental stresses.