Effect of late sowing date and nitrogen levels on seed yield, morphological characteristics and Chlorophyll index of Canola (Brassica nupus. L) in Ahvaz climatic condition

In order to study the effect of late sowing date and nitrogen levels on seed yield and morphological characteristics of canola (Hayola 401 cv), a study was conducted in Ramin Agricultural and Natural Resources Research Farm in 2010-2011. Experimental design was split plot in Randomize complete block order with four replications. Main plot was application of 0, 90, 180, 270 Kg/ha nitrogen and sub plot was two sowing date including 10 November (optimum condition) and 26 December (late sowing condition). Result showed late sowing date decreased canola seed yield about 50 percentage. Increasing of nitrogen amounts in both optimal and late sowing date condition caused significant increase in canola yield. The highest canola seed yield in late sowing date condition obtained in used 180kg/ha nitrogen (1237kg/ha) but use of 270kg/ha nitrogen didn’t increase in seed yield compared to use of 180kg/ha nitrogen (1372kg/ha). Result of the study suggested that application of nitrogen, improve canola seed yield at late sowing date condition.