To examine the effect of nitrogen and potassium elements on the quality and quantity of canola cultivars, an experiment has been conducted on the research farm of Zabol University in Zehak (Chah-Nimeh) during the cropping years of 2010-2011. The examined treatments include F0 (disuse of nitrogen and potassium fertilizer), F1 (use of 125 kg of potassium sulphate and 200 kg of Urea), F2 (200 kg potassium sulphate with 300 kg urea) and F3 ( mixing of 300 kg of potassium sulphate fertilizer and 400 kg of urea). The experiment has been conducted in form of factorial and complete randomized block design with 4 replications on two cultivars of rapeseeds (Sarigol and Hayola 401). The results indicate that Sarigol cultivar has more siliques per plant compared to Hayola 401. However, Hayola 401 cultivar has more grains per siliques and harvest index as well as better grain yield, biological yield compared to Sarigol cultivar. The measurements of both cultivars show that both of them have the most grain yield in treatment F3, the highest oil rate in treatment F2 and the least traits in treatment.
