CEREAL EXPERIMENTS AT DICKINSON, N. DAK. 5 
The average monthly distribution of the precipitation at Dickinson 
is presented graphically in figure 2, which shows a gradual increase 
in precipitation from January to June and a gradual decrease from 
June to December. This distribution is very favorable to the use of 
crops. However, the small amount of precipitation received during 
the fall and winter months makes crop growth almost entirely de- 
pendent upon the precipitation which occurs during the growing 
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Fic. 1.—Graph showing the annual and the mean precipitation for the 22 years from 
1892 to 19138, inclusive, at Dickinson, N. Dak. 
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YINCVIES OF FRE CFYVIAT/IOV. 
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77 
season. The normal precipitation for the months of April, May, 
June, July, and August, the growing season at Dickinson, is 10.84 
inches, or 70.1 per cent of the normal for the entire year. Should a 
drought period occur during the months of June and July, as was 
the case in 1911, a small crop is hkely to result, even though the pre- 
cipitation for the year is above normal. The precipitation and 
evaporation during the growing season for the seven years during 
which cooperative experiments with cereals have been conducted 
at the Dickinson substation are given in Table II. 
