24 Western Live-stock Management 
acreage, alfalfa is by far the biggest crop. The dry-farm 
sections are farmed under the dry-farm system, which is 
essentially summer fallow and careful tillage adapted to 
using two years’ moisture for the growing of one crop. 
These lands are largely on the rolling hills which have a 
good soil and an annual rainfall of twelve to twenty 
inches. The largest dry-farm areas are found in the 
MAP 30 
ALFALFA ACREAGE EACH DOT REPRESENTS | 
2 
FEFEREE 2 
Cals | 0a’ 
| Cas | ans, 
| ua. 
Om 
Wre 
One 
Fic. 4. 
eastern parts of Montana, in the Columbia Basin in 
eastern Oregon and Washington, and in the central val- 
leys of California. The big crop in the large dry-farm 
areas, and in fact very commonly the exclusive crop, is 
wheat. In some places rye is grown as a hay or forage 
crop, and farther south the sorghums, milo maize and 
similar drouth-resistant plants are grown as a feed for 
stock. These areas, however, must be considered very 
largely as wheat-growing districts and they produce live- 
stock only on a limited scale, with the exception of horses. 
