Comparison of iron oxide-impregnated paper strips with other extractants in determining available soil phosphorus
2006
Hosseinpur, A.R. | Ghanee, A.H.
Iron oxide-coated strips (P(i)) can serve as a sink to continuously remove phosphorus (P) from solution. In this way, P extraction is analogous to the P absorption by plant roots. The objective of this study was to compare the iron oxide-coated paper strips with other chemical extraction methods to estimate the plant P availability for corn (Zea mays) growing in the greenhouse in some soils of Hamadan province of Iran. Sixteen soil samples with different physicochemical properties were analyzed for available P using Olsen, Colwell, Mehlich-1, 0.01 M CaCl2, AB-DTPA, and 0.1 M HCl methods and p(i). Furthermore, the effects of two P levels (0 and 200 mg P kg(-1)) on the plant indices (P uptake, relative yield, and plant responses) were studied in a greenhouse experiment using 10 soil samples. The results showed that the amount of extractable P decreased in the order of 0.01 M CaCl2 < AB-DTPA < p(i) < Olsen < Colwell < Mehlich-1 < 0.1 M HCl. The amount of P extracted by the p(i) method was significantly correlated with other extractants. The amounts of P extracted by all chemical methods were significantly correlated. The results of a pot experiment showed that the amount of P extracted by the p(i) method was significantly correlated with the plant P uptake. However, the other methods were not significantly correlated with P uptake. The results of this experiment showed that p(i) method was able to predict the plant availability of soil P.
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