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The Penetration Resistance in a Soil with Well-defined Structural Units¹

ABSTRACT

Based on both laboratory and in situ probe penetration tests within each horizon of a soil with well-defined structural units, the magnitude and variability of probe resistance values in relation to probe diameter and structural features are presented. Total penetration resistance was equal for 0.376- and 0.514 cm-diam 60° angle probes; however, the resistance standard deviation and coefficient of variation were larger for the smaller probe. A pocket penetrometer gave significantly larger penetration resistances. There was a close relationship between probe penetration resistance of a 0.376-cm-diam probe and root length in natural B₃ horizon.

¹ Contribution from USDA-SEA-AR in cooperation with the Missouri Agric. Exp. Stn. Journal Series no. 8390.

² Soil Scientist, USDA-SEA-AR, Dep. of Agronomy, Purdue Univ., West Lafayette, IN 47907.

Received for publication September 24, 1979. Accepted for publication February 14, 1980.

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