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• W2000258180 abstract "Abstract The Pi test is a new soil test for phosphorus (P), which uses a strip of iron oxide‐impregnated paper as a sink to adsorb P mobilized in a soil‐solution suspension. The paper strips are prepared by immersing hardened filter paper circles in a 10% solution of ferric chloride; then they are dried and exposed to ammonia vapor. The paper is then cut into strips 10 cm long and 2 cm wide. To extract P, 1 g of soil is shaken for 16 h with 40 mL 0.01 M CaCl2 and a Pi strip, which is enclosed in a nylon mesh bag. Phosphorus retained on the strip is dissolved in 0.1 M H2SO4 and measured. The amount of P extracted by the paper strips has been found to correlate well with yield and P uptake by maize (Zea Mays L., Var. Funk 5757) grown on acidic, alkaline, and calcareous soils and in soils fertilized with soluble fertilizers and phosphate rock. To evaluate the suitability of the method to measure plant‐available P contained in a large number of soils, greenhouse experiments were carried out using 18 soils with widely differing properties. The results showed that the amount of P extracted by the Pi test correlated highly with dry‐matter yield of maize (r = 0.88**) and P uptake (r = 0.94**). The order of correlation was Pi‐P > Olsen‐P > Bray 1‐P > Bray 2‐P > Mehlich 1‐P. The amount of P extracted by Pi paper correlated best with Olsen‐P (r = 0.95**) followed by Bray 1‐P (r = 0.89**) and Bray 2‐P (r = 0.56*) across all soils. Bray 2 and Mehlich 1‐P overestimated P from two soils previously fertilized with phosphate rocks." @default.
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• W2000258180 date "1990-08-01" @default.
• W2000258180 modified "2023-09-27" @default.
• W2000258180 title "Development and evaluation of the Pi soil test for plant‐available phosphorus" @default.
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• W2000258180 doi "https://doi.org/10.1080/00103629009368295" @default.
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