Phosphorus (P) sufficiency during seed formation and development can
affect the quality of seeds production. For increasing P content of black seed
(Nigella sativa) in a calcareous soil, series of experiments were conducted in
completely randomized factorial design with 4 replications at the Faculty of
Agriculture, Ferdowsi University of Mashhad, Iran, in 2012 and 2013. The
combinations of vermicompost (V), sulfur (S), and Thiobacillus bacteria (T)
were mixed with a calcareous soil fertilized with 0, 30 and 60 kg P ha¡1 in
pots and incubated for 63 days. At the end of incubation period, black seeds
were sown in the pots and plants were grown to maturity. Results showed
that SCT and V treatments were significantly increased soil available P,
emergence, plant P content, seed yield and vigor of the seeds production.
There were positive relationship between soil and plant P concentration with
the quality of seeds production.
