Abstract
This field experiment was conducted during the season 2005-2006 in Singar - Mosul city to investigate the effects of very high level (320 N, 300 P2O5) kg ha-1, and high level (280 N, 260 P2O5) kg ha-1 of nitrogen and phosphorus fertilizer, pinch and with out pinch, and plant seed rate sowing 0.6, 0.8, 1.0, 1.2 g/10m2 was done by hand within 3, 4, 5, 6 rows respectively in (10)m2 plot size on seed components of Nigella sativa L. The experiment was laid out in randomized complete block design with three replications. The results include the following. Very high levels of nitrogen and phosphorus caused a significant increase in fixed oil, volatile oil, protein, and phosphorus; in contrast carbohydrate was significantly decreased, while humidity and ash cannot be affected with this factor. Pinching nigella plants causes a significantly increasing in fixed oil, ash, and carbohydrate of seeds while volatile oil, protein, and phosphorus were decreased significantly when compared with non pinched plants. Increased seed rate sowing from 0.8 to 1.2 g/10m2 caused significant increasing in fixed oil when compared with 0.6 g/10m2 while decreased seed rate sowing 0.6, 0.8 g/10m2 caused significant increases in volatile oil and ash when compared with 1.0, 1.2 g/10m2. Protein also Increased significantly from 20.67 to 24.40 with decreased seed rate sowing from 1.2 to 0.8 g/10m2.while medium rate cause significant increase in phosphorus when compared with lowest and highest rate, the lowest rate of see rate give the highest percentage of carbohydrate when compared with other .
