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Bulk Density Measurements on Certain Soils High in Coarse Fragments¹

ABSTRACT

Bulk density methods were employed in repetitious sampling of Millheim silt loam containing high amounts of soft shale coarse fragments. The bulk density of a 377,560 cm³ soil volume was also determined as a reference for evaluating the samples collected. Statistical analyses of the data indicate that the 347.5 cm³ core sample best evaluates bulk density. However, in soils containing fragments harder than shale, cores are impossible to collect. Clod samples closely approximate 347.5 cm³ core samples in evaluating bulk density and can be taken in almost any soil. Thus, they are a useful sample for the determination of bulk density with the advantage that it can be used for moisture retention measurements.

¹ Authorized for publication on May 5, 1967, as paper 3261 in the journal series of the Pennsylvania Agr. Exp. Sta., University Park, Pa.

² Assistant Professor and Professor of Soil Technology, Dep. of Agron., Pennsylvania State Univ., University Park, Pa.

Received for publication May 26, 1967. Accepted for publication September 14, 1967.