Erosion on Joe M. Johnston's farm 10 miles NW of Knoxville in Marion County, Iowa. Every other row of corn washed out of this 40-acre field. Worked and planted up and down hill 30 to 40 tons of soil loss per acre.
Erosion on Van Roekel farm 3 miles South of Monroe in Marion County, Iowa. No grassed waterway. Oats planted up and down hill. Silt fan formed below 2 foot gully. 20 tons soil lost per acre.
