The effect of harvesting date on quality and quantity characteristics in autumn genotypes of rapeseed (Brassica napus L.)

In order to evaluate the effect of different level of harvesting date in three autumn genotypes of rapeseed (Brassica napus) a factorial field experiment, arranged in a Randomized complete Block design with three replication was conducted in 2005-2006 in the research field of agricultural college of varamin university. Analysis of data indicated that there were significant differences in genotypes in Number of pod per plant, Number of grain per pods, 1000 grain weight, grain yield, oil yield and Harvest index. Maximum and Minimum grain yield was obtained from Hyola-42 and Zarfam genotypes with 3670 and 2732.3 Kg/ha respectively.. Harvesting date was significant differences on Number of grains per pods, 1000 grain weight, seed yield, oil percent, oil yield and harvest Index at the 1% level. The greatest yield was obtained from T3 (two week after cloresis stage) with average 2760 Kg/ha. Genotypes and harvesting date had significant effect on oil percent. In third harvesting date due to reduce of yield, oil yield reduced. Maximum of oil yield was obtained from second date of harvesting with 1577. 9 Kg/ha. Hyola-42 and Zarfam with average 1586.95 and 1156.7 Kg/ha respectively had the best and lowest oil yield