HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Al-Janabi, A. M. Articles by Drew, J. V. Search for Related Content PubMed Articles by Al-Janabi, A. M. Articles by Drew, J. V. GeoRef GeoRef Citation Agricola Articles by Al-Janabi, A. M. Articles by Drew, J. V.

Characterization and Genesis of a Sharpsburg-Wymore Soil Sequence in Southeastern Nebraska¹

ABSTRACT

Major belts of Sharpsburg and Wymore soils in southeastern Nebraska are related to a gradient of loess which varies from a continuous mantle adjacent to the Missouri river valley to a thin, discontinuoan mantle with increasing distance toward the southwest. Sharpsburg with a silty clay loam subsoil occurs where loess is relatively continuous, whereas Wymore with a silty clay subsoil occurs in thin and discontinuous loess farther from the river valley. Within these belts, soils with well-developed sub-soils frequently occupy high, relatively stable positions on interfluves, whereas soils with less well-developed subsoils occur on the beveled, younger surfaces of interfluve slopes.

In a transition zone between major belts of Sharpsburg and Wymore, however, a reverse situation exists. Here Sharpsburg occurs on the highest positions of interfluves and gives way to Wymore on beveled slopes at lower elevations. Morphological, particle size, and mineralogical data indicate that a sequence of soils within this transition zone increases in degree of development from the top to the side of an interfluve in the order Sharpsburg-Wymore. Hypotheses presented to explain the distribution of these soils on the landscape involve differences in soil moisture regime or rate of loess accumulation as influenced by slope characteristics.

¹ Contribution from the Dep. of Agronomy, Univ. of Nebraska, Lincoln. Published with the approval of the Director as paper, 1854, Journal Series, Nebraska Agr. Exp. Sta.

² Former graduate student, Univ. of Nebraska, now Assistant Specialist, Soil Survey and Classification, Ministry of Agriculture Abu Ghraib, Iraq, and Professor of Agronomy, Univ. of Nebraska, respectively.

Received for publication February 28, 1966. Accepted for publication October 26, 1966.