Effect of Row Spacing and Nitrogen fertilization on Growth, Yield and Quality of Some Rapeseed Genotypes (Brassica napus L.)

A field experiment was conducted to determine the response of Rapeseed genotypes ( Brassica napus L.) to Nitrogen fertilization and Row Spacing in two winter successive seasons 2007-2008,2008-2009. Each experiment comprised of Four Rapeseed Genotypes (Conl, Pactol , Olga and Elvira), three Nitrogen fertilizers levels (0 , 80 and 160 kg N ha– 1) and two Row Spacing (30,60 cm). It was conducted according to Randomized Completely Block Design with split - split plot with three replications. The results could be summarized as : The Conl Genotype gave a high level for characters Plant height, number of primary branches, number of Silique/plant, leaf area index , dry weight/plant (g.), number of seeds/silique, weight of thousand seed(g) ,Total Yield and oil Yield (ton.ha-1) and oil percentage in both seasons 2007-2008, 2008-2009 respectively. Nitrogen fertilizers levels had significantly affected on Plant height, number of primary branches, number of silique/plant, leaf area index , dry weight/plant, weight of thousand seed and oil yield. 160 Kg N .ha–1 treatment gave highest seed weight and oil yield, while increasing concentration of Nitrogen to 160 Kg. ha–1 cause a significant decrease in oil percentage of seed in the two seasons 2007-2008 , 2008-2009 respectively. Increasing row spacing to 60cm led to significant increases in plant high, number of primary branches, number of Silique/plant, dry weight/plant, weight of thousand seed and oil yield, while decreasing Row Spacing to 30cm cause a significant increase in leaf area index and oil percentage of seed in both seasons 2007-2008 , 2008-2009 respectively.