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Lime Requirement Determination of Soils¹

ABSTRACT

A method is proposed for determining the amount of lime needed under field conditions to bring acid soils to the neutral point. In this method a sample of soil is treated with a measured amount (always an excess) of standard calcium bicarbonate solution. After evaporation followed by wetting with water and a second evaporation, the excess of calcium bicarbonate which was added, now in the form of CaCO₃, is determined by means of the Collins' Calcimeter. This instrument measures the CO₂ evolved when the sample is treated with dilute HCl. From the volume of CO₂ evolved, the excess of carbonate added and by difference the amount that reacted with the soil, the lime requirement, are calculated. The results obtained with several soils check closely with those obtained in field plot tests where varying amounts of lime were added.

¹ Contribution from the Department of Soils, University of Wisconsin, Madison, Wis. Published with the permission of the Director of the Wisconsin Agricultural Experiment Station. This paper includes part of a thesis submitted by the senior author in partial fulfillment of the requirements for the degree of Doctor of Philosophy, University of Wisconsin. Appreciation is expressed by him to the governments of Bombay State and Baroda State for his deputation to the U.S.A. for graduate training, and to the F. L. Musbach Soils Fellowship Bequest for financial support during the final semester. Paper received for publication September 20, 1951.

² Graduate Fellow and Professor of Soils, respectively.