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Effect of Liming on the Soil Test Level of Phosphorous as Determined By Three Methods¹

ABSTRACT

Changes in extractable P resulting from additions of Ca(OH)₂ to samples of 13 acid Connecticut soils varied with soil type and soil extractant. The average pH increase from 5.3 to 7.7 resulted in the following average changes in extractable P: modified Morgan, +123%; North Carolina, +27%; Bray no. 1, –23%. Changes in Bray no. 1 extractable P were affected less by soil differences than changes in P extracted by the other two methods.

¹ Scientific Contribution no. 449, Agricultural Experiment Station, University of Connecticut, Storrs, Conn.

² Associate Professor of Agronomy, Plant Science Department.

Received for publication November 6, 1970. Accepted for publication February 19, 1971.