254 DRY-FARMING 
Tree growing on dry-farm lands is not yet well 
established and, therefore, should be undertaken 
with great care. Varieties accustomed to the climatic 
environment should be chosen, and the principles 
outlined in the preceding pages should be carefully 
used. 
Potatoes 
In recent years, potatoes have become one of the 
best dry-farm crops. Almost wherever tried on lands 
under a rainfall of twelve inches or more potatoes 
have given comparatively large yields. To-day, the 
growing of dry-farm potatoes is becoming an impor- 
tant industry. The principles of light seeding and 
thorough cultivation are indispensable for success. 
Potatoes are well adapted for use in rotations, where 
summer fallowing is not thought desirable. Mac- 
donald enumerates the following as the best varieties 
at present used on dry-farms: Ohio, Mammoth, 
Pearl, Rural New Yorker, and Burbank. 
Miscellaneous 
A further list of dry-farm erops would include rep- 
resentatives of nearly all economic plants, most of 
them tried in small quantity in various localities. 
Sugar beets, vegetables, bulbous plants, etc., have 
all been grown without irrigation under dry-farm 
conditions. Some of these will no doubt be found 
