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Magnesium Forms in Selected Temperate and Tropical Soils¹

ABSTRACT

A scheme was developed for fractionating soil Mg into exchangeable, organic-complexed, acid-soluble, and primary mineral forms. The scheme was tried out on 20 soils from different regions of the world. Magnesium content was influenced by the nature of the parent materials, climate, and age of the soil. There was more Mg in youthful alluvial soils from Southeast Asia as well as loess and till-derived Illinois soils which had high amounts of 2:1 lattice clays. Highly weathered oxisols from Sierra Leone were low in Mg. In general, within the soils studied, Mg distribution ranked in the following order: Primary mineral > Acid-soluble > Exchangeable > Organic-complexed.

Oxisols that had very low exchangeable Mg contained appreciable amounts of Mg in the form of Mg-Al silicates of reduced solubility. Organic-complexed Mg was very low in all the soils studied.

¹ Contribution from the Dep. of Agronomy, Illinois Agr. Exp. Sta. Urbana, Illinois 61801. Part of a thesis submitted by the senior author in partial fulfillment of the requirements of the Ph.D. degree.

² Research Assistant, and Professor of Soil Chemistry, Dep. of Agronomy, Univ. of Illinois, respectively.

Received for publication April 28, 1972. Accepted for publication June 9, 1972.