The study of concentration of nutrients in rapeseed and its growth response to inoculation with plant growth promoting bacteria in arsenic contaminated soil

The purpose of the present research was to study the impact of plant growth promoting bacteriaon characteristics of growth and the amount of nutrients in rapeseedin soil contaminated by arsenic. different levels of arsenic (0, 22.5, 15.5, 7.5 and 30 mg/kg) injected into the soil, after two months, inoculation of plant growth promoting bacteria and cultured canolara. Three months later, harvesting of rapeseed and some growth indices, magnesium, arsenic and phosphorus evaluated. The results of means comparison indicated that the maximum plant height from arsenic by Pseudomonas Putida and the minimum plant height from 30mg/kg arsenic by Azospirillum were 20.53 cm and 11.31 cm, respectively. The highest fresh and dry weightin obtained than lowest level of arsenic by Pseudomonas Putidaand. lowest fresh and dry weight in high arsenic concentration attained by Azospirillum.At the highest concentration of arsenic in the soil, the lowest leaf density by Pseudomonas fluorescence BR1 obtained to be 8.33 and the highest leaf density (39.33) by inoculated treatment of Pseudomonas fluorescence BR150 attained. With increase of arsenic in the soil, the magnesium and phosphorus in rapeseed were decreased, and with 30 mg/kg arsenic, they were reduced to the lowest level which were 0.13 mg/kg and %0.314, respectively