Iron oxide-coated strips (P_i) can serve as a sink to continuously remove P from solution. In this way, probably, P extraction is analogous to P absorption by plant root. The objective of this study was to evaluate the iron oxide-coated paper strips to estimate the availability of soil P of corn (Zea mays) grown under greenhouse conditions in some soils of Hamadan Province. Sixteen soil samples with different physico-chemical properties were examined for available P by Olsen, Colwell, Mehlich1, 0.01 M CaCl₂, AB-DTPA, 0.1 M HCl methods and two (P_i1, P_i2) P_i methods. Furthermore, the effects of two P levels ( 0 and 250 mg P Kg^-1 soil) on the plant responses (P uptake, P concentration, and relative yield) were studied in the greenhouse experiment using 12 soil samples. The results showed that the amount of extractable P decreased in the order: 0.01 M Cacl₂ < P_i2 < AB-DTPA < P_i1 < Olsen

Keywords: Phosphorus, Extractant, Corn.

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