Survey of Adaptation of Thirty Rice (Oryza sativa L.) Genotypes to West Guilan Climatic Conditions-Astara

Adaptation of thirty rice genotypes was studied in a completely randomized block design experiment with 3 replications for two cropping seasons (2005-2006) in Astara. Analysis of variance showed that differences among the years for the most of traits were not significant where as there was a significant difference among the genotypes and genotype by year interaction. Correlation coefficient of the traits under study showed that grain yield had a positive and significant correlation with number of tiller per plant, paddy yield and harvest index. Stepwise regression analysis revealed that the paddy yield per plant and panicle length had a positive and significant effect on the grain yield. Cluster analysis of genotypes in these grouped genotypes into three categories. Two years of experiment showed these lines producing higher yields, were better adapted to Nemat, line 338, Sangtaroom, Dorfak, Mehr and line 6 fell into the second group.