Abstract
Field experiment was conducted during the season 2005-2006 in Singar - Mosul city to investigate the effects of high level (280 N, 260 P2O5) kg ha-1 and very high level (320 N, 300 P2O5) kg ha-1 fertilizer, pinch and without pinch, and plant seed rate sowing (0.6, 0.8, 1.0, 1.2) g/10m2 cultivated within 3, 4, 5, 6 rows respectively in (10) m2 plot area on growth and yield of Nigella sativa L. The experiment was laid out in randomized complete block design with three replications. The results indicated that. Very high level of nitrogen and phosphorus caused a significant increase in plant length, stem diameter, fresh weight, plant seed yield and total seeds yield kg/ha, were as branches number, and fruits number cannot be effected significantly by previous factor. Pinching causes a significantly increased in branches number, fruits number, while plant high decreased significantly. Increased seed rate sowing from 0.6 to 1.2 g/10m2 caused a significant increasing in branches number, fresh weight, and plant seeds yield, while stem diameter, and fruits number didn’t effected significantly by this factor except total seeds yield kg/ha which increased significantly when seed rate sowing are increased to 1.2g/10m2 and they reach 651.85, 843.56, 1076.51, 1232.67 kg/ha for the four seed rate consecutively.
Highlights
Nigella (Nigella sativa L.) is an annual herbaceous plant belonging to the family Ranunculacea. (Majed and Mahmod, 1988)
Ahmed (1997) show that there were no significant effect in plant high, branch number when increasing planting distant from 20 - 40 cm between nigella plants, while 30 cm caused an increment in vegetative dry weight, fruit number, and seed yield per plant
Decreased seed rate sowing to 0.6 g/10m2 and increased it to 1.2 g/10m2 give plant high 40.50, 41.16 cm respectively which significantly differ when comparison with those sowing at seed rate 1.0, and 0.8 g/10m2 39.11, 39.49 cm respectively
Summary
Nigella (Nigella sativa L.) is an annual herbaceous plant belonging to the family Ranunculacea. (Majed and Mahmod, 1988). Ahmed (1997) show that there were no significant effect in plant high, branch number when increasing planting distant from 20 - 40 cm between nigella plants, while 30 cm caused an increment in vegetative dry weight, fruit number, and seed yield per plant. Ahmed (1997) found that foliar Nigella sativa plants with triple calcium super phosphate fertilizer (20, 40, 60) P2O5 /feddan caused a significant increase in plant high, stem diameter, branch numbers, dry weight, fruit number. Hammo and AlAtrakchii (2006) on Nigella sativa found that increase fertilizer level of nitrogen and phosphorus to 240 N and 220 kg P2O5 kg ha-1 causes significant increases in plant high, stem diameter, branches number, vegetative dry weight, fruits number, and seed production. This study were done to clarify the influence of very high levels of fertilizers, seed rate sowing, and pinching on vegetative growth and seed yield of nigella plant
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