This 2-year-old shelterbelt is already exerting a protective influence on cropland. 
IN ADDITION, the cooperative planting of 
field windbreaks (shelterbelts) on farms in 
the Prairie States proceeds at but a fraction 
of the pace dictated by the need and justi- 
fied by the results. Shelterbelts retard 
wind velocity, prevent wind erosion, con- 
serve soil moisture, increase crop yields, and 
enrich the lives of families. 
[37 
