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A Technique for Obtaining Undisturbed Soil Samples by Freezing in Situ¹

ABSTRACT

A freezing technique employing liquid nitrogen has been developed to freeze soil blocks in situ. This technique makes it possible to collect undisturbed samples from soils that are incoherent, have an abundance of roots or have a high percentage of coarse skeletal materials. The frozen blocks can be transported to the laboratory in a frozen state and eut into desired-size blocks for bulk density, moisture retention and micromorphological studies.

¹ Joint contribution from Agronomy Department, Ohio Agr. Res. & Devel. Center, State Special Project 151, and the Northeastern Forest Exp. Sta., Forest Service, USDA. Contract no. A9fs-6472, Journal Paper no. 82-67; Columbus, Ohio.

² Research Associate in Agronomy; Research Soil Scientist, Forest Service, USDA; and Professor of Agronomy, respectively.

Received for publication May 27, 1968. Accepted for publication June 21, 1968.