اثر متقابل منابع نیتروژن و مقادیر گوگرد بر عملکرد دانه، پروتئین و اسیدهای چرب کلزای (Brassica napus L.) زمستانه

In order to evaluate the interaction effects between nitrogen sources and sulphur rates on on seed yield, protein and fatty acids in winter rapeseed (Brassica napus L. c.v. Okapi), two field experiment were carried out during 2008 - 2010 cropping seasons as factorial arrangement in a randomized complete block design with three replications in Agricultural and Natural Resources Research Center of Markazi Province, Arak. The sources of nitrogen based on 150 kg/ha N (N1 = Azocompost, N2 = 50% Azocompost plus 50% Urea and N3 = Urea) and sulphur rates (S1 = 0, S2 = 40 and S3 = 80 kg/ha S) comprised the experimental factors. Results showed that the interaction effects between nitrogen sources and sulphur rates were significant for all measured traits at 1% probability level. In this experiment, the interaction effects between integrated nutrition system × 40 kg S/ha showed the highest seed yield, protein yield per hectare and linolenic acid in comparison with other treatments.In general, results showed that plant nutrition management by selecting nitrogen source type and ratio of sulphur fertilizers, could increase seed yield and improve fatty acids combination in rapeseed.