Effect of rock phosphate rates, inoculation with bacillus megatherium and v a mycorrhizas on growth, yield and chemical constituents of black cumin (nigella sativa l.)‎ Plants

الملخص EN

A field experiment was conducted during two successive seasons 2006 / 2007 and 2007 / 2008 to determine the influence of phosphate fertilizer namely : calcium superphosphate at the recommended dose (200 kg / fed.), rock phosphate at the rates of (128, 256 and 384 kg / fed.) and bio-fertilizers.

The bio-fertilizer used were Bacillus megatherium var.

phosphaticum (BM) (used as seed inoculants) and vesicular arbuscular mycorrhizal fungi (VAM) (used as soil inoculants) and their interactions.

Effect of the previous treatments on vegetative growth, yield, volatile and fixed oils percentage and yield, carbohydrates %, protein %, phosphorus % and P uptake of black cumin plants were studied in this investigation.

The obtained data showed that plant height, branches number, herb dry weight, capsules number, seed yield / plant and / feddan, volatile and fixed oils % and yield / plant and / feddan, P % and uptake, protein % and carbohydrates % were led to the augmentation of due to phosphate fertilization treatments.

The highest values of these previous parameters were observed when receiving the plants calcium superphosphate and / or rock phosphate at the high rate.

In regard to bio-fertilizer treatments, all of them led to increase the growth, seed yield, volatile and fixed oils % and yield, P % and uptake, protein % and carbohydrates %.

The best results in terms of these characters were obtained when inoculating the plants with BM + VAM.

In most cases, the combined effect between phosphate fertilizer and bio-fertilizer treatments on black cumin parameters was statistically significant.

In most cases, inoculating the plants in combination with calcium superphosphate and / or the high rate of rock phosphate was the most effective treatments concerning growth, yield as well as chemical constituents.