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Spodic Horizon Brittleness in Leon (Aeric Haplaquod) Soils¹

ABSTRACT

Three delineations of Leon soils (Aeric Haplaquod; sandy, siliceous, thermic) on two geomorphic surfaces in the lower Coastal Plain of North Carolina were studied. Consistence of the upper part of the spodic horizon ranges from friable to brittle. Brittleness was associated with mineral material that was slightly finer in mean particle size, less well sorted, and slightly more fine skewed than spodic horizons that were not brittle. No chemical, mineralogical, or organic matter composition was related to brittleness. Brittle spodic layers are very different from nonbrittle layers in micromorphology, having their macropacking voids filled with organic matter and silt-sized mineral material.

¹ Paper No. 5171 of the J. Ser. of the North Carolina Agric. Exp. Stn. Raleigh, NC 27607.

² Soil Scientist, USDA-SCS; Professor and Soil Scientist; USDA-SCS and Graduate Assistant, respectively.

Received for publication January 19, 1977. Accepted for publication May 27, 1977.