Iron Oxide-impregnated Filter Paper (Pi test): II. A Review of its Application
| Author | R. G. Menon | |
| Author | Sen H. Chien | |
| Author | W. J. Chardon | |
| Date of acession | 2024-03-15T08:11:10Z | |
| Date of availability | 2024-03-15T08:11:10Z | |
| Date of issue | 2005 | |
| Abstract | The iron oxide impregnated filter paper test (Pi test) is a recently developed soil test for phosphorus (P) in which the FeO paper acts as an infinite sink for P mobilized in a soil solution. Several papers have been published evaluating the effectiveness of the test for predicting plant availability of P under different soil conditions. The use of FeO paper to predict algal availability of P in water bodies and runoffs has also been studied. The purpose of this paper is to review studies on the use of the Pi test to evaluate plant availability of P in soils, and predict availability of P to algae in an aquatic environment. Phosphorus extracted by the FeO paper is primarily physically bound extractable (resin P) and correlates significantly with Bray I and Mehtich P in acid soils and Olsen P in calcareous soils. Dry-matter yield and P uptake by maize (Zea mays L), kidney beans (Phaseolus vuIgaris L), and upland rice (Oryza sativa L) grown in acidic soils correlated well with Pi-P. Likewise, in calcareous soils, Pi-P was as good as Olsen-P in predicting crop response. Field trials have shown that the Pi test is a good predictor of plant yield in soils with wide ranging properties. Compared to the standard method to measure bioavailable P to algae in waters and agricultural runoffs involving lengthy algal essays culturing selenastrum capricornutum with sediment samples, the Pi method is a faster and easier method to estimate P that may be potentially available for uptake by algae. | |
| URL | https://hub.ifdc.org/handle/20.500.14297/2910 | |
| Language | en | |
| Title | Iron Oxide-impregnated Filter Paper (Pi test): II. A Review of its Application | |
| Type | Article |
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