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Determination of Plant‐available Phosphorus by the Iron Hydroxide‐impregnated Filter Paper (Pi) Soil Test
Author(s) -
Me R. G.,
Hammond L. L.,
Sissingh H. A.
Publication year - 1989
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1989.03615995005300010020x
Subject(s) - soil water , dry matter , phosphorus , agronomy , chemistry , fertilizer , yield (engineering) , hydroxide , filter paper , extraction (chemistry) , phosphate , crop , environmental science , soil science , biology , materials science , organic chemistry , chromatography , metallurgy
Abstract The use of iron hydroxide‐impregnated filter paper (P i ) strips as a collector for phosphorus (P) in soil suspension offers a new approach to soil testing for plant‐available P. To correlate the P i test with crop response, four soils ranging in pH from 4.5 to 8.2 were incubated with three rates of P either as triple superphosphate (TSP) or central Florida phosphate rock (CFPR), and P was measured in these soils by the P i , Bray 1, Bray 2, double acid, Olsen, water, and resin extraction methods. Two successive crops of maize ( Zea mays L.) were grown on these soils in greenhouse pots, and the dry matter yield and P uptake by maize were correlated with the soil test values. The P i gave highly significant correlation with crop response in all four soils. Across all soils, P source, rates of application and crops, P i gave the best correlation (0.870) with P uptake and dry matter yield. The next best correlation with dry matter yield was that of Olsen extractable P. The P i test showed potential as a tool for prediction of P fertilizer requirements in soils.