Genetic variation and character association for grain yield and component traits in traditional rice (Oryza sativa L.) cultivars of Assam

An experiment was conducted with a view to obtain information of genetic parameters variation and character association for 13 quantitative traits in set 64 rice cultivars Assam. The study revealed significant differences all the under study. Highest genotypic coefficient observed trait biological yield followed by harvest index grain yield. More than 80% heritability except yield, effective tillers per plant Genetic advance as cent mean highest index, filled grains panicle Higher magnitude along considerably high indicated that these could be considered selection gain. Character studies direct 100 - weight, length, breadth, would bring about improvement Non-significant important attributes viz., panicle, length were due their strong duration genotypes, which turn negatively associated yield.  Recombination breeding recurrent selection, therefore, suggested break negative linkage order achieve further improvement. Keywords: association, improvement, variability,