64 
BULLETIN 1039, U. S. DEPARTMENT OF AGRICULTURE. 
The yields of the wheat, flax, and the mixtures of both are shown 
in Table XLVII. 
Table XLVII. — Yields of flax and ivheat separately and mixtures of these crops 
grown on irrigated land on the Belle Fourche Experiment Farm in 1917 ^T\ 
and 1918. " 
Crop. 
Rates of seeding and yields per acre 
(pounds). 
Seeding. 
Yields. 
1917 
1918 
Average. 
Flax 
Wheat 
M ^ ure {wheat 
Wheat 
37 
75 
} "• 
941 
150 
1,100 
1,425 
1,300 
867 
1,408 
1,308 
1,467 
1,442 
904 
1,279 
1,204 
1,446 
1,371 
Larger total yields of wheat and flax were obtained from the mix- 
tures than from either crop grown alone. Wheat predominated in 
the mixtures. The value of the practice of growing the mixture 
of wheat and flax will depend on the relative prices and yields of the 
two crops. The cost of separating the thrashed crop must also be 
considered. It was necessary to let the wheat stand for some time 
after it was ripe before the flax could be harvested, and it was also 
rather difficult to thrash the flaxseed without cracking many of the 
wheat grains. 
COMPARISON OF GRAIN CROPS. 
In 1912, 1913, and 1914 the only small grains grown in the cereal 
experiments under irrigation were spring varieties of wheat, oats, 
barley, and emmer. In 1915 and since several additional grains have 
been grown. The annual and average yields of the leading varieties 
of each of the grains grown in 1915 and later are shown in Table 
XLVIII. 
Winter wheat and-^winter rye were grown during only four of the 
five years from 1915 to 1919, inclusive, while winter spelt, Avinter 
emmer, proso, and buckwheat were grown only two years each. In 
terms of pounds of grain per acre, winter wheat gave the highest 
yield in 1915, oats in 1916 and 1919, spring wheat in 1917, and barley 
in 1918. Chevalier II barley has outyielded all other grains during 
both the 4-year and the 5-year periods, for which the average yields 
are shown in Table XLVIII. Vernal spring emmer and White Rus- 
sian oats gave the next highest yields of grain. Winter emmer, win- 
