Date of this Version
Thesis (M.S.)--University of Nebraska--Lincoln, 1966. Department of Agronomy.
The purpose of this investigation of four western Nebraska soils was to study the relationship of volcanic ash to certain chemical and physical properties of these soils. A field reconnaissance was made of the central part of Dawes County to select the four soil profiles for analysis: Keith, Richfield, Scott and Keota. Efforts were made to select a sequence of three soils expressing progressive degrees of development within a short distance and occurring in the same parent material, and to find a fourth soil developing in a different parent material within a reasonable distance from the first three. Chemical, physical and mineralogical procedures were used to characterize the soils as well as the volcanic ash and associated alteration products within the soils. Results of the study suggest that the Keith, Richfield, and Scott soils developed in a mantle of loess overlying Miocene sediments and represent toposequence. In contract, the Keota soil developed at lower elevations in pedisediment derived from the Oligocene Brule formation.
Advisor: James V. Drew.