Effect of row spacing and nitrogen fertilization on growth, yield and quality of Some rapeseed genotypes (Brassica napus L.)‎

الملخص EN

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.

@