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Susceptibility to Compression of a Clay Loam Haplaquoll¹

ABSTRACT

The objective of this study was to determine the compressibility of a poorly drained clay loam soil cropped to corn (Zea mays L.) with moldboard plowing as primary tillage (CN) or with no tillage (NT). Undisturbed cylindrical cores (100 cm³)obtained from planter-tracked (WT) and untracked (NWT) interrows just prior to harvest, were subjected to uniaxial compression after being equilibrated at soil moisture potentials () of –5, –10, –20, and –40 kPa. The precompression (over-consolidated) and virgin compression regions were isolated by plotting bulk weight volume (v) against the logarithm of applied pressure. The breakpoint or precompression pressures (p), which separated the over- and virgin compression regions, were determined using a statistical procedure. There was no apparent p for cores from CN-NWT interrows with at or above –10 kPa. Tracking of tilled interrows resulted in the presence of over-consolidated regions at all moisture potentials. Virgin compression indices (slopes) decreased in the order CN-NWT > CN-WT > NT-NWT > NT-WT. A highly significant correlation (p < 0.01) was obtained between p and the undrained strength as measured by the fall-cone device.

¹ Land Resource Research Centre Contribution no. 86-44, and Scientific Journal Series Paper no. 14 948, Minnesota Agric. Exp. Stn.

² Physical Scientist, Land Resource Research Centre, Central Experimental Farm, Ottawa, Canada K1A OC6; Professor and Head, Dep. of Soil Science, Univ. of Minnesota, St. Paul, MN 55108.

Received for publication July 7, 1986.

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