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ABSTRACT
Soils identified as belonging to the Alligator and Sharkey series are of wide distribution and importance on portions of the Lower Ohio River Valley Flood Plain. Previous morphological and chemical studies indicated a close similarity of these soils. Further studies of physical properties, including particle size distribution, aggregate stability, bulk density, plastic limits, pore space, available moisture, percolation rates, along with sand, silt, and clay mineralogy, indicate that in most characteristics there are greater ranges between profiles within a series than between series. These data strongly support the hypothesis that these soils should be included in the same classification and mapping category in the Lower Ohio River Valley; namely, Vertic Haplaquepts: fine montmorillonitic, nonacid, mesic. The suggested classification is in the Karnak series.
1 Contribution from the Dept. of Agronomy, Univ. of Kentucky, Lexington 40506. The investigation reported in this paper (no. 68-3-19) is in connection with a project of the Kentucky Agr. Exp. Sta. and is published with approval of the director. Presented before the joint meeting of Div. S-2 and S-5, Soil Science Society of America at Kansas City, Mo. on Nov. 16, 1964.
2 Associate Professors of Agronomy, Univ. of Kentucky; formerly Graduate Student, Univ. of Kentucky, now Agronomist, Agricultural Division, Olin, Little Rock, Ark.
Received for publication October 5, 1970. Accepted for publication April 15, 1971.
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