Abstract
The experiment was conducted at the farm of Agriculture and Forestry college – Mosul Univ. for two seasons 2005 / 2007. The effect of three sowing dates ( 15 Oct. , 4. Nov. and 25 Nov. at 2005 – 2006), and (13 Oct., 2 Nov. and 22 Nov. at 2006 - 2007) for the seasons subsequently, with two harvesting dates: after 30 and 40 days from forming 50 percent of flowering / plant were studied. The experiment was laid out as randomize complete block design with split plot arrangement with three replications. The results showed that high values were obtained from No. siliqua / plant, wt. of 500 seeds, seed and oil yield with first sowing date ( 15 and 13 Oct.) for 2005 – 2006 and 2006 – 2007 seasons respectively. Second harvesting date (after 40 days from forming50 percent of flowering / plant) was higher in wt. of 500 seeds , seed and oil yield. The interaction of the first sowing date with the second harvesting date gave a significant increase in seed and oil yield , which increased up to 1885.9 and 837.3 kg ha-1 at the first season, and up to 1425.4 and 621.5 kg ha-1 at the second season respectively. Correlation between seed yield and No. of siliqua / plant and wt. of 500 seeds were significantly higher, while seed yield correlated negative decrease with No. of seed / siliqua for both seasons.
