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Identification of Fragipans by Means of Mercury Intrusion Porosimetry¹

ABSTRACT

Soil pore size distributions were measured and interpreted for undisturbed, oven-dried peds using Hg intrusion porosimetry. These distributions were compared to those calculated from moisture release data. Bulk densities were measured using Saran coated clods and Hg intrusion. The Saran coated method resulted in lower density values which was attributed to pores with diameters larger than 200 µm that were not included in the Hg intrusion method. The porosity results showed the fragipan layers contained significantly less porosity from 0.17 to 200 µm, water storage pores (50 to 0.5 µm), and pores between 10 and 200 µm than adjacent horizons within the soil profile. Hg intrusion appears to be a useful tool in determining which soil horizons are root restricting and in identifying the presence of fragipan layers in soils.

¹ Contribution no. 1499, Cornell Agricultural Experiment Station, Ithaca, NY.

² Assistant Professor, Agronomy Dep, Univ of Illinois, Urbana, IL.

Received for publication March 30, 1984. Accepted for publication October 5, 1984.

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