effects of different dates of transplanting on rapeseed (brassica napus l.) yield and its components as second crop after rice in ghilan (rasht) conditions

an experiment conducted to study the effects of transplanting dates on rapeseed (brassica napus l.) yield and its components as second crop after rice in agriculture faculty of ghlilan university. this research was conducted in a randomized complete block design (rcbd) with 3 replications on the pf (sarigol) cultivar. treatments consisted various dates of transplanting in cluding 1st november, 21st november, 11st december and 31st december. the results showed that the effect of different dates of transplanting were significant on the grain yield and oil yield (p<0.01). highest grain yield achieved from 1st november transplanting date with 2754.1 kg. ha1 and lowest resulted in 31st december with 1338.2 kg. ha1. also, highest pod per plant achieved from 1st november transplanting date with 142 pods and lowest was on 31st december with 52% reduction. highest number of seed per pod was 21 at 1st november transplanting date. optimum transplanting date had significant effect on grain yield and delay on transplanting date, decreased it. transplanting date of 1st november did not caused any significantly difference with 21st november. based on our research the best transplanting date for pf (sarigol) cultivar of rapeseed was at 1st to 21st of november.