DRY-FARMING ZONES 



under climatic conditions which exist 

 nowhere else in the United States. Ex- 

 periments must here be conducted that 

 shall determine what portions can be used 

 for general dry-land agriculture and 

 what portions are unfitted for that pur- 

 pose. And when it has been demon- 

 strated that certain portions of the area 

 are unsuited to general dry-land agri- 

 culture, it must be determined how these 

 portions can best be utilized for stock- 

 raising ; and where this industry becomes 

 the predominating one, means must be 

 devised for supplementing the natural 

 grasses of the range with forage plants, 

 either annual or perennial." 



There are many persons who believe 

 that the climate of the Great Plains is 

 changing. Studies in climatology, how- 

 ever, do not support this theory, and this 

 portion of the United States is likely to 

 remain an area of comparatively light 



9 165 



