Effects of Combined Application of As and P on the Growth Characteristics and Uptake of As and P by Two Wheat and Marigold Plants

Concern about arsenic pollution to soils and plants has been on an increase، throughout the world and an interaction of As with P due to the similarity in chemical characteristics has been also reported. In the present research، a factorial experiment was conducted as based upon a randomized complete block design of three replications including three levels of arsenic (0، 50 and 100 mg kg-1) from a sodium arsenate source، and phosphorus (0، 20 and 40 mg kg-1) taken from a source of mono calcium phosphate. After 90 days past، the dry weight of shoot and root، chlorophyll index، concentrations and total contents of As and P were determined. The results showed that by increase in As level، shoot and root weight، chlorophyll index and water use efficiency in the two plants decreased. By an increase in As level، the concentration and uptake of As within shoots and roots of the plants wheat and marigold increased، while the concentration and uptake of P being decreased. With increase in As level، the translocation factor of As in wheat decreased while it increased in marigold. The P translocation factor was fount to decreased by an increase in As level، for both plants.