202 



DRY-FARMING 



and in fact because of the dry winters is practically 

 indispensable. 



This latter view is confirmed by the experimental 

 results obtained by Atkinson and others at the j\Ion- 

 tana E.xperiment Stations, which are conducted under 

 approximately Great Plains concUtions. The average 

 results follow (See Figs. 48 and 49) : — 



It should be mentioned also that in Saskatchewan, 

 in the north end (jf the Great Plains area, and which 

 is characteristic, except for a lower annual tempera- 

 ture, (jf the wliole area, and ^^•here dry-farming has 

 been i.)racticed for a quarter of a century, the clean 

 summer fallow has come to be an established practice. 



This recent discussion of the place of fallowing 

 in the agriculture of the Great Plains area illustrates 

 what has been said so often in this volume about the 

 adapting of principles to local conchtions. Wlierever 

 the summer rainfall is sufficient to mature a crop, 



