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Greenhouse Evaluation of Residual Phosphate by Four Phosphorus Methods in Neutral and Calcareous Soils¹

ABSTRACT

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 ³²P methods on the 23 test soils.

¹ Contribution from the U.S. Dep. of Agric., Sci. and Ed. Admin., in cooperation with the Colorado State Univ. Exp. Stn. Scientific Series no. 2270.

² Soil Scientists and Soil Scientist (retired), Agric. Res. Service, USDA, Agron. Dept., CSU, Fort Collins, CO 80523.

Received for publication October 25, 1977. Accepted for publication February 27, 1978.

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