Effect of Nitrogen Level on Quality Characters of High Quality Hybrid Brassica napus Variety

16 quality characters of two quality hybrid rape varieties(Sanbei 98 and Youyan 599) under the condition of different nitrogen application level were analyzed to discuss the relationship between nitrogen application level and quality characters.The results showed that nitrogen application level had very significant effect on oil content and seed protein.And very significant or significant effect on total oil + protein content and no obvious effect on the content of erucic acid,glucosinolates,palmitic acid,stearic acid,eicosenoic acid,saturated fatty acid,unsaturated fatty acid and index of unsaturated fatty acid,unsaturated fatty acid-saturated fatty acid ratio.There were different significant effects on oleic acid,linoleic acid,linilenic acid and total oleic acid + linoleic acid in two tested varieties.There was very significant negative relation ship between oil content and nitrogen application level.Seed protein was very positively related to nitrogen application level.There was no significant negative relation between nitrogen application level and erucic acid,glucosinolates,palmitic acid,saturated fatty acid,unsaturated fatty acid.There were no significant or significant negative relation between nitrogen application level and oleic acid,linoleic acid,oleic acid+ linoleic acid.There was no significant or very significant positive relation between nitrogen application level and linolenic acid.There were differences in the relations between nitrogen application level and stearic acid,eicosenoic acid,index of unsaturated fatty acid,unsaturated fatty acid/saturated fatty acid ratio in two tested varieties.There was very significant negative relation between oil content and seed protein,linolenic acid,very significant positive relation between seed protein and linolenic acid,and significant or very significant positive relation between linolenic acid and palmitic acid.