Effect of arsenic contamination on phosphoure of soil and phosphorus concentration in soybean

This study aimed to investigate the effect of arsenic and phosphorus bioavailability of soil phosphorus and total phosphorus concentration in soybean for this purpose a factorial experiment in a completely randomized design with 3 factors and 3 replicates was conducted into the pots with soil media in the greenhouse of Agricultural Research. The factors were soybean with two levels (L17 native varieties and promising lines), arsenic with four levels (0, 10, 50 and 100 mg.kg-1) and phosphorus with four levels (0, 25, 50 and 100 mg.kg-1). Di potassium hydrogen phosphate and disodium hydrogen arsenate salts of phosphorus and arsenic in soil added. The results showed that by increasing in the concentration of arsenic in the phosphorus treatment, phosphorus bioavailability of soil increased (P≤0.05). 10 mg.kg-1 Arsenic in soil germination percentage increased to 6.4% compared to control (P≥0.05). High levels of arsenic (50 and 100 mg.kg-1) caused decrease (16.11 and 76.68 %, respectively) in the germination percentage in comparison to the control (P≤0.01). Adverse effects of concentrations of arsenic, which stop the growth and eventually death of the plant. Arsenic reduced shoot biomass and increased total phosphorus plant (P≤0.01). The results of interaction of phosphorus and arsenic showed that with increasing concentration of phosphorus in soil containing arsenic, total phosphorus concentration rose plant (P≤0.05).