Determination of Optimum Nitrogen Levels in Different Planting Dates of Canola in Khouzestan

Delaying sowing cultivation of canola was cased by Khouzestan rotation condition. In order to reduce comprehensive cultivation delay injury, this study was carried out in Shavoor Agricultural Research Station during 2004-2006 in randomized complete block design (RCBD) in split plot method with 4 planting dates 11th Nov, 21th Nov, 1th Dec, and 11th Dec in main plots and five nitrogen levels, 0, 50, 100, 150 and 200 kg/ha in sub plots with 3 replications. The results of the component analysis showed delay in planting from 11th Nov to 11th Dec reduced 24.6 pods per plant, 3.1 seed per pod, 0.43gr thousands seed weight, 1084.8 kg/ha seed yield, 5.6 seed oil percent and 539.1 kg/ha oil yield. There was significant difference between nitrogen levels application increasing form 0 to 200 kg N/ha to increase 55.3 pods per plant, 2.1 seed per pods, 0.6 gr thousands seed weight, 1965.7 kg/ha seed yield, 3.5 seed oil percent and 789.0 kg/ha oil yeild. Interaction effects showed that yield and yield component increased significantly by increasing of nitrogen levels for each planting date. Because there was no significant difference between 150 and 200 kg N/ha, 150 and 200 kg N/ha for normal and late planting date were recommended respectively.