40 DRY-FARMING 



August. May and June are generally the months 

 of least rainfall." 



"The Northern Rocky Mountain and Eastern Foot- 

 hills Type. — This type is closely allied to that of 

 the plains to the eastward, and the bulk of the rain 

 falls in the foothills of the region in April and May ; 

 in Montana, in Alay and June." 



"The Plains Type. — This tj-pe embraces the 

 greater part of the Dakotas, Nebraska, Kansas, 

 Oklahoma, the Panhandle of Texas, and all the great 

 corn and wheat states of the interior valleys. This 

 region is characterized by a scant winter precipita- 

 tion over the northern states and moderately heavy 

 rains during the growing season. The bulk of the 

 rains comes in ^laj^, June, and Jul.v." 



This classification, with the accompanying chart 

 (Fig. 14), emphasizes the great variation in distri- 

 bution of rainfall over the dry-farm territory of the 

 country. West of the Rocky ^fountains the precipi- 

 tation comes chiefly in winter and spring, leaving 

 the summers rainless; while east of the Rockies, 

 the winters are somewhat rainless and the precipi- 

 tation comes chiefly in spring and summer. The 

 Arizona type stands midway between these types. 

 This variation in the distribution of the rainfall re- 

 quires that different methods be employed in storing 

 and conserving the rainfah for crop production. 

 The adaptation of cultural methods to the seasonal 

 distribution of rainfall will be discussed hereafter. 



