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Greenhouse Evaluation of Residual Phosphate by Four Phosphorus Methods in Neutral and Calcareous Soils
Author(s) -
Bowman R. A.,
Olsen S. R.,
Watanabe F. S.
Publication year - 1978
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/sssaj1978.03615995004200030015x
Subject(s) - soil water , greenhouse , phosphorus , calcareous , calcareous soils , chemistry , phosphate , zoology , environmental chemistry , agronomy , environmental science , botany , soil science , biology , organic chemistry
Four determinations of phosphorus—Olsen‐P, Colwell‐P, total exchangeable P, and resin‐extractable P—were evaluated in terms of total plant P uptake in a 3‐year continuous greenhouse study of 23 high P calcareous and neutral soils. All methods were highly correlated with the total P taken up from the soils by 5–8 successive greenhouse crops. The Olsen‐P procedure extracted an average of nearly 50% of the total plant P while the Colwell procedure extracted nearly 80%. Resin‐extractable P and total exchangeable P values approximated the total plant P uptake, and served as good biological measures of the total plant‐available P in the soil. No significant differences were observed between the carrier and carrier‐free 32 P methods on the 23 test soils.