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Total Mercury Content in Morrow Plot Soils over a Period of 63 Years¹

ABSTRACT

Over a 63-year period, Hg varied from 0.1 to 3.92 ppm in samples from surface horizons of soils from Plots on the University of Illinois campus. The dominant secular trend has been to lower levels in recent time. Neither changes in organic carbon content nor agronomic practices were related to Hg levels. Large amounts of coal burned in a nearby power plant did not contribute a fallout of Hg to the soils. A change toward improved internal soil drainage caused by tile drainage is thought to be the major factor causing the trend.

¹ Contribution from Agronomy Dep., Univ. of Illinois at Urbana-Champaign, Urbana, 61801. Published with approval of the Director, Agr. Exp. Sta.

² Associate Professor of Soil Mineralogy and Ecology and Assistant Professor of Soil Ecology, respectively.

Received for publication April 17, 1972. Accepted for publication July 20, 1972.