Abstract
Pots experiment was carried out in the greenhouse of Horticulture Department College of Agriculture Engineering Sciences/ University of Duhok to investigate the influence of three levels of P2O5 fertilizer (0, 260 and 520 mg ) per pot , humic acid at (0, 0.6 and 0.8 mg.L-1) and magnetic water with three group, group (1) irrigated with tap water, group (2) irrigated with magnetized water remain in the container for 12 hours and group (3) irrigated with magnetized water remain in the container for 24 hours on the growth and oil yield of Black cumin Nigella sativa L. The experimental treatments consisted of five replications in Random Complete Block Design (RCBD). The results revealed that P2O5 fertilizer at 520 mg.pot-1 significantly increased all the studied characteristics. Humic acid at 0.6 and 0.8 mg.L-1 had no significant effect on most of the studied characteristics except total chlorophyll and volatile oil. The group of plants that irrigated with magnetic water for 24 h caused significant increasing in all studied characteristics. Double and triple interactions among studies factors showed significant influence on all the studied characteristics as compared to untreated plants including (plant height, number of branches per plant, stem diameter, number of capsule/plant, dry weight, total chlorophyll, fixed oil percentage, volatile oil percentage and total carbohydrates percentage).
Highlights
One of the most important medicinal plants is Black cumin (Nigella sativa L)
Giza 3 plant the seeds of broad bean were irrigated with water passed through magnetic device is carried out by (Hameda and El Sayed, 2014), the results showed that magnetic water treatment enhanced the growth, chemical constituents such as chlorophyll a and b, carotenoids, total available carbohydrates, protein, total amino acids, total phenol, RNA,DNA,) and inorganic minerals (K+, Na+, Ca+2and P+3) contents in all parts of broad bean plant
The results in Table (2) indicated that P2O5 fertilizer at 520 mg.pot-1 significantly increased the height of plant (58.82 cm) compared to (45.18 cm) at 0 mg.pot-1 P2O5, mentioned that the effect of magnetic water represented was significantly increased the height of plants to (59.03 cm) in compression with untreated plant was (53.98 cm) .while the height of plant had no significant effect when treated with humic acid the values were (56.86, 56.61 and 56.82 cm) respectively for 0,0.6,0.8 mg.L-1 concentration
Summary
One of the most important medicinal plants is Black cumin (Nigella sativa L). It is an annual herbaceous plant belonging to the family Ranunculacea which grows in west Asia and Mediterranean region, it is one of the most studied plants extensively due to its importance in phytochemical and pharmaceutical aspects (Riaz et al, 1996).The plant acquired its Pharmacological activity and its medical value in great splendor and occupied a special place for medicinal plants in the Islamic civilization through the ideological belief in its treatment of multiple diseases the holy prophet, Mohammed (peace be upon him ) that the plant is Heals all sickness except death. (Ul-Hassan Gilani.,et al 2004). Pot-1 concentration compared to untreated plants and the values respectively were (5.24and 4.52mm).Irrigating the plants with magnetic water 24h was significantly differed with the plans irrigated with0 and 12h tap water and they were respectively (5.33, 4.48 mm and 4.93).The results showed that all concentrations of humic acid do not have significant effect on steam diameter.
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