ON DRY-FARMING INVESTIGATIONS IN THE UNITED STATES. 279 
Bartery. Dickson, N.D., 1911. BarueEy. DrcKrson, N.D., 1913. 
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Fic. 6.—Moisture conditions in a barley plat at Dickinson, North Dakota. The 
dotted lines represent the wilting coefficient for each foot-section. 
to penetrate the intervening dry layer, and the crop was a failure. 
In 1912 the crop was destroyed by hail, so that the plat was virtually 
in fallow during this season. The rainfall in 1912 was ample and the 
soil was well supplied with water in the spring of 1913, as shown 
in the second part of the chart. During this year a heavy crop of 
barley was grown, which was produced in part with water present in 
