CEREAL EXPERIMENTS AT DICKINSON, N. DAK. 



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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Fig. 1. — Graph showing the annual and the mean precipitation for the 22 years from 

 1802 to 1913, inclusive, at Dickinson, N. Dak. 



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 likely 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. 



