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A Comparison of Several Methods of Determining Lime Requirements of Soils¹

ABSTRACT

Buffer-indicated lime requirements of four groups of soils using several buffer methods were related to CaCO₂ incubation-measured lime requirements through regression analysis. Salt accumulated during the incubation period had marked effect on the amount of lime required to bring the soils to pH 6.5. Results from all buffer methods were highly correlated with incubation-measured values. Slopes and intercepts of regression lines revealed the marked tendency for the Woodruff buffer to indicate too much at low lime requirement levels and too little at high levels. The Mehlich buffer at pH 8.1 indicated approximately the correct amount for soils of high lime requirement but too much for those at low levels. Peech alterations of the Mehlich and the regular Mehlich method gave the same results. The Shoemaker, McLean, and Pratt method was found to be relatively rapid, accurate, and especially well adapted for soils requiring >4,000 lb of lime per acre, having <pH 5.8, containing <10% organic matter, and having apprecitable quantities of soluble Al.

¹ Published with the permission of the Director of the Ohio Agr. Exp. Sta. as Journal Article No. 25-65. Portions of these results are from M.S. Theses of the junior authors 1965 and 1964, respectively, Ohio State University. Financial assistance from the Ohio Agr. Extension Service and the Rockefeller Foundation is gratefully acknowledged.

² Professor of Agronomy, former Research Assistant, and former Graduate Student, respectively, Ohio State University.

Received for publication April 19, 1965. Accepted for publication October 29, 1965.