selection of the best rapeseed genotypes as second crop in paddy fields of guilan

in order to identify the suitable rapeseed genotypes as second crop in paddy fields of guilan province, 14 rapeseed genotypes were grown in complete randomized block design with three replicates in a paddy fields experimental condition in rice research institute of iran, rasht during 2005-2007 cropping seasons. the results of the combined analysis of variance indicated significant difference among rapeseed genotypes, year and year×genotype interaction effect for most of evaluated traits. mean comparison of yield and other traits showed that hyola 330 and hyola 401 produced maximum grain yield with average of 3400 and 3298 kg/ha, respectively. hyola 330 was in the first rank for most studied traits. hyola 401 and hyola 308 had the highest silique numbers per plant and the lowest days to maturity, respectively. genotypes hyola 330, hyola 420 and hyola 401 were in a group and had the highest oil yield. also, cluster analysis put these genotypes in a group together. according to the analysis of variance and slicing the interactions, hyola 401 due to high yielding and earlier maturity in both years is recommended as superior genotypes for cultivation in paddy rasht.