42 
BULLETIN 1039, U. S. DEPARTMENT OF AGBICTXI/FUKE. 
The average yield of Kharkof winter wheat during the five rears 
was 1,800 pounds per acre. Kherson oats yielded at the rate of 1,415 
pounds per acre. Hannchen barley 1.405 pounds, and Kubanka spring 
wheat at the rate of 1,378 pounds per acre. Other cereal crops 
yielded less than the spring wheat. The period from 1913 to 1917 
was usually favorable for winter wheat, but this crop, although 
rather uncertain, may be expected to yield more than other cereals 
on the average. The yields in pounds per acre of well-adapted 
varieties of spring wheat, oats, and barley are nearly the same. 
The Manchu Brown kaoliang, because of its resistance to early 
drought, outyielded all other crops in 1917. In 1916 the Red Rus- 
sian proso produced more grain than the other crops. This was 
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Fig. 13. — DiagTam showing; the average yields, in bushels per acre, of the leading varieties 
of flax on dry land at the Belle Fourche Experiment Farm for the 6-year period from 
1914 to 1919, inclusive. 
partly because the kaoliang was frosted, while the other crops were 
injured by rust, soil blowing, or drought. 
EXPERIMENTS WITH FLAX. 
Flax is a crop usually grown on new sod land. However, when 
grown in rotation on land fairly free from weeds it can be grown 
successfully on land which has been previously cropped. The yields 
of flax at Xewell have compared rather favorably with the small 
grains when the value of the crop is considered. Flax is less certain 
than the small grains, as it is more easily injured by drought, frost, 
and soil blowing. 
VARIETAL EXPERIMENTS. 
The varietal experiments with flax were begun in 191*2. Twelve 
varieties have been grown in plats on dry land during the period 
