Studying the effects of different seed rate and nitrogen application on seed and oil yield of rapeseed, Zarfam Cultivar

In order to investigate the effect and sufficientcy of nitrogen and seed rate on yield of seed and oil and yield component of rapeseed cultivar Zarfam, a field experiment was conducted in a factorial based on randomized complete design with three replications in agricultural and natural resources research center of Lorestan province, Iran during 2004-2006(In irrigation conditions). In this experiment five urea levels of 0.5R, 0.75R, 1.25R and 1.5R (R=recommended rate of 285 kg/ha) were assigned to main plots and four seeding rates (6, 8, 10 and 12 kg/ha) were assigned to subplots. Analysis pooled over the year of experiment showed that grain yield was not significantly different among nitrogen levels. The result, also, showed that the effect of none of seeding rates was significant. Interaction effect of nitrogen level of 1.5R and seeding rate of 8kg/ha significantly had the highest seed yield of 4686.5 kg/ha.The number of silique per plant and plant height showed significantly positive correlation with grain yield Oil percentage had significant positive correlation only with 1000 grain weight. between grain yield and oil percent was significant negative correlation. It is concluded that nitrogen level of 0.5R and seeding rate 6-8 kg/ha is suitable for the area under study.