APPLIED ECOLOGY 



331 



FlG. 177. Waste field-margins such as the fourteen-foot strip (1) aban- 

 doned because of root competition and erosion can be made useful. (2) 

 Lespedeza bicolor (tall) and L. sericea planted in strips are holding the mar- 

 gin stable and producing food and cover for small game.— U. S. Soil Con- 

 servation Service. 



the help of science possible. 226 A farm planted year after year to 

 wheat or cotton does not, even with fertilizer, conform to the 

 balances that occur in nature. Well-managed fields may seem to 



