The Effect of Organic and Phosphorus Fertilizers Application on Chromium VI Accumulation in the Radish Irrigated with Contaminated Water

In order to evaluate the effect of phosphate fertilizers and organic compounds on some growth characteristics of the radish (Rhaphanus sativus L) irrigated with chromium- contaminated water at the concentration of 0.25 mg L-1, a greenhouse experiment was conducted at the Faculty of Agriculture, Shahrood University of Technology as a randomized complete block design with three replications. The treatments were: control, di-ammonium phosphate (41 mg P kg-1), triple superphosphate (41 mg P kg-1), alfalfa powder (1%), humic acid (1.38 mg kg-1), di-ammonium phosphate alfalfa powder, humic acid di-ammonium phosphate, triple super phosphate humic acid and triple superphosphate alfalfa powder. Analysis of variance revealed that there were significant differences among treatments on soluble phosphorus of soil, root chromium VI, electrical conductivity (EC) and pH. The most effective treatment for reducing chromium VI concentration of the radish root, was observed in application of triple super phosphate combined with humic acid, so that its concentration was reduced by 57.5 percent in comparison to the control treatment. The concentration of chromium VI in the root was 59.11 percent more than thet in the shoot. Considering the edible root of radish, it seems the use of phosphate fertilizers and organic compounds can decrease the absorption of chromium in the radish plant and prevent the accumulation of chromium VI in the tissues of the plant, especially in root.