202 DRY-FARMING 
and in fact because of the dry winters is practically 
indispensable. 
This latter view is confirmed by the experimental 
esults obtained by Atkinson and others at the Mon- 
tana Experiment Stations, which are conducted under 
approximately Great Plains conditions. The average 
results follow (See Figs. 48 and 49) : — 
KUBANKA Ware Hout- Srxty-pay 
Sprina WHEAT] Less BARLEY ATS 
SuBSTATION Grown Grown Grown 
Con- | After | Con- | After | Con- | After 
tinu- | Fallow | tinu- | Fallow| tinu- | Fallow 
ously ously ously 
Bushel Bushel Bushel | Bushel | Bushel | Bushel 
Dawson County ... . 15.18 | 17.57 | 15.97 | 20.90 | 31.17 | 51.00 
Rosebud County . .. . 16.98 | 20.80 | 15.02 | 28.31 | 30.21 | 40.03 
Yellowstone County . ‘i 7.73 | 19.32 | 14.90 | 20.83 | 13.75 | 47.94 
Chouteau County... . 14.18 | 17.35 | 13.29 | 11.95 | 28.90 | 34.56 
Average » x a ‘ 13.52 | 18.76 | 14.79 | 20.37 | 26.01 | 43.38 
It should be mentioned also that in Saskatchewan, 
in the north end of the Great Plains area, and which 
is characteristic, except for a lower annual tempera- 
ture, of the whole area, and where dry-farming has 
been practiced 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 conditions. Wherever 
the summer rainfall is sufficient to mature a crop, 
