Affects different levels of nitrogen and plant density in canola (Brassica napus L.) yield in paddy field

In order to evaluate the application of different levels of nitrogen and plant densities on agronomical traits of canola a split plot experimental design based on randomized completely block design (RCBD) in three replications was conducted during 2005-2006 cropping season. The canola plant was cultivated in paddy field in rotation with rice. The main plot consisting 4 levels of nitrogen fertilizer application: 0 (control), 46, 92 and 138 kg nitrogen and the sub plot comprising: 3 different levels of plant densities 65, 80 and 95 plants/ m2. The results drive from the experiment showed that number of sub-branch, pods in main stem and secondary stem, total number of pods per unit area, number of seed per pod, oil and seed yield all increased with an increase in amount of nitrogen application at 138 kg/h significantly. Maximum seed yield (3134 kg/h) gained at 80 plants/m2, therefore it was concluded that application of 138 kg/h at the density of 80 plants/m2was the most suitable treatment for increased canola seed yield in canola plant in paddy field at the situation of the experiment.