CROPS THAT MAY BE GROWN IN DRY AREAS 195 



will always be more important, relatively, than win- 

 ter wheat in much of the dry areas of the Dakotas, 

 and in the eastern portion of the dry areas in western 

 Canada. Precipitation increases in the autumn and win- 

 ter, as the Cascade Mountains are approached. The 

 areas, therefore, other things being equal, that have, the 

 lowest adaptation for growing spring wheat are those 

 nearest to the Cascades, and the measure of suitability 

 should be increased as these are receded from. Where 

 the bulk of the precipitation falls in winter, too much 



DRY LAND WHEAT NEAR KALISPELL, MONTANA. 

 Courtesy Great Northern Railway Co. 



of it leaves the soil before crops of spring wheat may be 

 matured. , ' .1 



The place for flax in much of the dry area is a very 

 important one, but it will not be of equal significance in 

 all areas. It grows in reasonably cool rather than in 

 warm temperatures. Because of this, the growth of 

 flax will be pursued to a much greater extent in the 

 northern areas of the semi-arid belt than in those farther 



