Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2010.1461.1465Brassica napus L.) Yield and Yield Components in Southern Iran]]>KazemeiniS.A.EdalatM.ShekoofaA.HamidiR.1220101014This study was carried out to evaluate the influence of nitrogen levels (0, 50, 100 and 150 kg N ha^{-1}) and plant densities (70, 80 and 90 plants m^{-2}) on some growth parameters and yield components of the rapeseed. The experimental design was split plot with three replications during 2006-2007 and 2007-2008. Results revealed that with increasing plant density from 70 to 80 and 90 plants m^{-2}, 1000 seed weight (partial R^{2} = 0.91), number of branches (partial R^{2} = 0.83) and seed weight (partial R^{2} = 0.94) were the most important variables contributing seed yield, respectively. As, with increasing nitrogen, variables contributing seed yield, were changed. Stepwise regression analysis showed that with increasing nitrogen from 0 to 50 and from 100 to 150 kg ha^{-1}, seed weight per main pod, pod number per branch and seed number per sub pod explained 91, 89 and 87% variations of seed yield, respectively. It means that, with increasing of nitrogen from 0 to 50 kg N ha^{-1}, the role of seed weight per main pod decreased (partial R^{2} = 0.91 vs. 0.75). Pearson correlation results revealed that seed yield has positive correlation with seed weight per main pod (r = 0.89*), number of pod per branch (r = 0.93**), number of seed per main pod (r = 0.86*). According to the results, application of 150 kg N ha^{-1} and 90 plants m^{-2} for the maximum return unit area were recommended. Finally, it can be concluded that under high density and nitrogen, seed weight per sub pod was the most important variable contributing seed yield.]]>Ahmadi, M. and M.J. Bahrani,2009Ali, M.H., A.M.M.D. Rahman and M.J. Ullah,1990 napus).]]>Ball, R.A., L.C. Purcell and E.D. Vories,2000Diepenbrock, W.,2000Brassica napus L.): A review.]]>Fathi, G., A. Bani-Saeidi, S.A. Siadat and F. Ebrahimpour,2002Ali, I.E.A., U. Kalkafi, I. Yamaguchi, Y. Sugimoto and S. Inanaga,1998Kuchtova, P. and J. Vašak,2004Mehmet, O.Z.,2008Morrison, M.J., P.B.E. McVetty and R. Scarth,1990Khan, N., A. Jan., I.A.K. Ihsanullah and N. Khan,2002Nuttall, W.F., A.P. Moulin and L.J. Townley-Smith,1992Ozer, H.,2003Pattl, N., K.C. Lakkineni and S.C. Bhargava,1996Prasad, S. and D.N. Shakla,1991Brassica napus L.).]]>Rathke, G.W., O. Christen and W. Diepenbrock,2005Brassica napus L.) grown in different crop rotations.]]>Raymer, P.L.,2002SAS Institute,1996Sidlauskas, G. and P. Tarakanovas,2004Brassica napus L.).]]>Sieling, K. and O. Christen, 1997Brassica napus L.).]]>Sovero, M.,1993Starner, E.D., H.L. Bhardwaj, A. Hamama and M. Rangappa,1996Taylor, A.J., C.J. Smith and I.B. Wilson,1991Brassica napus L.).]]>Yousaf, N. and A. Ahmad,2002Trivedi, S.K. and V. Singh,1999Phaseolus mungo) Indian mustard (Brassica juncea L.) cropping sequence to fertilizer application.]]>