The following information on the rate of soil loss comes from Five Acres and Independence by M. G. Kains. Five Acres and Independence is also available to purchase in print.
Per Cent of Rainfall in Run-Off, and Rate of Soil is Lost by Sheet Erosion from Land under Different Systems of Management
[Duley, F. L., and Miller, M. F. Erosion and surface run-off under different soil conditions. Mo. Agr. Expt. Sta. Res. Bul. 63:1-50. 1923.]
An idea of the importance of keeping the soil covered by some crop will be apparent from study of the figures in Table 21 and will emphasize the necessity of taking proper care of the land, especially where there are slopes. See Chapter 23.