LEGUMINOUS PLANTS. 1 07 



Peas may be grown as a grain crop with marked 

 success in nearly all the tillable portions of the United 

 States and Canada above the 45th parallel of 

 north latitude, that is to say, in all places north of 

 the latitude of Bangor, in Maine, St. Paul, in Minne- 

 sota, and Salem, in Oregon. They can also be 

 grown quite as successfully in some localities two or 

 three degrees south of this parallel, from the Atlantic 

 to the Mississippi and also in Oregon on the Pacific 

 slope. And in some localities much further south it 

 is very probable that peas can be grown in good form 

 where the altitude is sufficient. 



The highest adaptation for peas grown without 

 irrigation is probably found in the states of Wash- 

 ington and Oregon and in British Columbia, on the 

 slopes nearest to the sea (Fig. 15). The highest 

 adaptation when grown under irrigation is probably 

 found in the inland valleys of Montana, Idaho, 

 \Yashington, Wyoming and Colorado. The most 

 general adaptation in any one state or province is 

 probably found in Ontario, with Michigan and Wis- 

 consin close seconds. And the highest adaptation 

 on the prairies is probably found in North Dakota, 

 northern Minnesota and Manitoba. 



But peas can be grown successfully for forage 

 and soiling food much further south than the line 

 drawn as the southern limit of highest production of 

 grain. This is more especially true when the peas 

 are grown in combination with other grain. When 

 grown thus for pasture, the grain, of course, is not 

 considered, and when grown for soiling food it is 

 not so important relatively as when the peas are 

 grown for the fodder. 



Place in the Rotation. If a crop of peas is 



