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Volcanic Glass Influence on Selected Soil Properties in Western Nebraska

Dep. of Plant Science and Technology, North Carolina Agricultural and Technical State Univ., Greensboro, NC 27411

D. T. Lewis

Dep. of Agronomy, Univ. of Nebraska, Lincoln

*Corresponding author.

ABSTRACT

Volcanic glass exerts an influence on surface area, water-holding capacity, and cation-exchange capacity. This study was conducted to quantify the volcanic glass in the Mitchell (coarse-silty, mixed [calcareous], mesic Ustic Torriorthent) and Tripp (coarse-silty, mixed, mesic Aridic Haplustoll) soils in western Nebraska and to determine the influence of glass on cation-exchange capacity, surface area, and water retention at 1.5 MPa. These properties are important in understanding soil response to management practices. Surface area and water retention at 1.5 MPa increased with depth in the soils. The increasing water retention at 1.5 MPa with depth was associated with volcanic glass, which might indicate more amorphous material in the clay fraction. The ratio of water retention at 1.5-MPa tension to clay (g/kg) determined by standard analysis was greater than 0.6, suggesting that clay should be estimated by calculation (water content at 1.5 MPa x 2.5) for Mitchell and Tripp soils.

Contribution of the Nebraska Agric. Exp. Stn., Journal Series no. 7575, Univ. of Nebraska, Lincoln.

Received for publication June 8, 1989.