Effect of Seeding Rate and Nitrogen Fertilizer on Seed Yield and Its Components of Oilseed Rape cv. Opera

To determine the effect of seeding rate and nitrogen fertilizer on seed yield and its components for oilseed rape a field experiment was carried-out in Agricultural Research Station of Islamabad-e-Gharb in two cropping seasons (2007-08 and 2008-09). A factorial arrangement using randomized complete block design with 4 replications was used. Experimential factors were seeding rate at 4 levels; 4، 6، 8 and 10 kg ha-1 and five nitrogen fertilizer rates; 0، 30، 60، 90 and 120 kg ha-1 from urea source. Results showed that seed yield was affected by increasing seeding rate as the seed yield in highest and lowest seeding rates were 5391 and 4041 kg ha-1، respectively. Increasing seeding rate reduced branch plant-1 and pod plant-1، but increased plant height. Results also showed that increasing nitrogen increased seed yield as the highest level of nitrogen had the highest seed yield with 5392 kg ha-1 and the lowest seed yield with 4257 kg ha-1 belonged to the lowest nitrogen level. Seed yield، 1000 seed weight، plant height and pod plant-1 increased as application of nitrogen fertilizer increased.