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Report on Flame Photometric Determination of Exchangeable Mangesium in Soils¹

ABSTRACT

Twelve soil samples, varying from about 40 to 1600 ppm. of exchangeable Mg, were analyzed for this constituent by collaborators at 13 state and federal laboratories. Twelve laboratories used the Beckman flame photometer and one laboratory the standard AOAC method. All laboratories followed the same extraction procedure, and at 7 of these the determinations were made by two operators. An analysis of variance revealed there were highly significant differences in the results obtained between laboratories and between operators within laboratories. However, in terms of the accuracy usually obtained for Mg by other methods, there was fairly good agreement between laboratories and between the flame photometric and AOAC methods.

¹ Report of Committee on Chemical Analysis, Soil Science Society of America. Committee members at time of this study: O. J. Attoe, C. A. Bower, L. E. Ensminger, E. R. Graham, S. W. Melsted, S. R. Olsen, W. M. Shaw, and R. V. Olson, chairman. Published with the approval of the Director, Wisconsin Agr. Exp. Sta., Madison, Wis.

² Professor of Soils, University of Wisconsin, Madison. The author expresses appreciation to the Collaborators and members of the Committee for their fine cooperation in this study, to R. B. Corey for technical assistance, and to J. H. Torrie and S. O. Thompson for the statistical analyses.

Received for publication May 20, 1959. Accepted for publication July 17, 1959.