Effect of phosphorus in reducing arsenic availability in soils and arsenic uptake by maize

A pot experiment was carried out in the net house of Soil Science Division of Bangladesh Agricultural Research Institute (BARI), Joydebpur Gazipur on 16 March 2010 and 12 January 2011 with a view of study the effect of P addition to As-contaminated soils and the consequences on As uptake of maize (Zea mays L.) plants. Experiments were conducted in consecutive two years. Arsenic was added to the pots at the rates of 0, 20 and 30 mg kg?1, and P at 0, 30 and 60 mg kg?1. Thus there were seven treatment combinations, i.e., As0P0, As20P0, As30P0, As20P30, As20P60, As30P30, and As30P60. Phosphorus fertilization increased total As uptake, but the increase was restricted to the root. As concentration of root was much higher than that of shoot. As concentrations in shoot and root were positively correlated (r = 0.913, r = 0.975; P