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.
Contour farmng on Cyril Rees' farm NE of Pleasantville in Marion County, Iowa. 25 acre field seeded to oats on contour with buffer strips following corn in 1943. Buffers and waterways seeded in 1941. Very little erosion.
Contoured watershed on L.C. Shivvers' farm in Knoxville, Iowa. Farm maintained by Leo Goad and Howard Shannon. This 50 - acre cornfield received 3 - inch rains in 8 days. No washing. Contouring and grassed waterway shown in the foreground of the…
