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Effect of Corn Steep Liquor for Erosion Control and Vegetative Establishment on Highway Backslopes

Various concentrations of a corn steep liquor slurry were compared with straw mulch for erosion control and vegetative establishment on highway backslope plots. Applications of 5 and 10% corn steep liquor slurry followed immediately with lime slurry formed a thin, stabilized surface layer that resisted initial erosion on backslope plots after seeding. However, plant growth, cover, and erosion control over a growing season were the greatest under straw mulch, with no significant differences noted from the various corn steep liquor treatments by the end of the season. Growth chamber studies showed corn steep liquor slurry concentrations of over 10% solids applied at 1.4 liters/m² retarded emergence of tall fescue seedlings up to 1 week. Soil moisture evaporation losses in a greenhouse study were not significantly affected by various rates of corn steep liquor application, but were greatly decreased by straw mulch.

Key Words: Corn steep liquor • Erosion • Highway seeding • Vegetative establishment

² Associate Professor, Professor, and Associate Professor, respectively, Dep. of Agronomy, Ohio Agricultural Research and Development Center, Wooster 44691, and Ohio State University, Columbus. The authors wish to acknowledge the financial support for this project from the A. E. Staley Mfg Co., Decatur, Ill. and to thank Roscoe E. Smith, formerly Graduate Assistant, for assisting in the early phases of this work.

Received for publication June 28, 1968.