The effect of different Nitrogen Levels on oil yield and harvest index of two spring rapeseed cultivars in Isfahan region

ABSTRACT: According to the increasing need of our country to edible and production of oil plants, an experiment was conducted in order to evaluate the responses of two spring rape seed cultivars to different nitrogen levels. A split plot layout with completely randomized block design with 3 replications was used. Main plot were different level of nitrogen fertilizer (0,50,100 and 150 kg ha-1) from urea source, and sub plot were different cultivars (Hyola 401 and Hyola 60). This research was conducted in 2010-2011, at research farm of farming building of Islamic Azad University Khorasgan (Isfahan) Branch located in Khatun abad village (latitude 32o /40ʹ N and Longitude 51o /48ʹ E). Condition represented the effect of N fertilizer was significant on seed yield, biological yield and oil yield. Effect of cultivar was significant on the number of seed per pod, seed yield, biological yield and oil percentage. The maximum of all mentioned factors except oil percentage, related to 100 kg N ha-1 fertilizer treatment and Hyola 401. The highest of oil percentage was achieved in 150kgN ha-1 and Hyola 60. N fertilizer and cultivar interaction had no significant influence on experimental characteristics.