CEREALS OX THE BELLE FOUECHE EXPERIMENT FARM. 
63 
Table XLYI. — Yields of icheat, oats, and barley, separately and mixtures of 
these crops, grown on irrigated land on the Belle Fourche Experiment Farm, 
1915 to 1917, inclusive. 
Crop and mixture. 
Yields per acre (pounds). 
1915 
1916 
1917 Average. 
Barley 
Oats 
Wheat 
Barley and oats 
Barley and wheat 
Oats and wheat 
Barley, oats, and wheat 
Averages of crops grown alone 
Barley and oats 
Barley and wheat 
Oats and wheat , 
Barley, oats, and wheat. . . 
1,830 
1,108 
1,825 
1,300 
1,641 
1,083 
1,950 
1,300 
1,775 
1,0S3 
1,750 
1,333 
1,930 
1,283 
1,828 
1,204 
1,735 
1,095 
1,733 
1,191 
1,765 
1,164 
2,516 
2,325 
2,391 
2,516 
2,300 
2,225 
2,108 
2,420 
2,453 
2,35S 
2,411 
1,818 
1,816 
1,705 
1,922 
1,719 
1,769 
1,774 
1,817 
1,761 
1,760 
1,780 
In 1915 all of the mixtures and in 1916 all of the mixtures except 
the barley and wheat showed higher yields than the averages of the 
drops grown alone. In 1917 the barley and wheat, oats and wheat, 
and the barley, oats, and wheat mixtures yielded less than the aver- 
ages in the grains sown alone. The 3-year average yields show very 
little advantage in growing the grain mixtures. The barley and oats 
mixture yielded 105 pounds per acre more than the average of the 
two crops grown alone, but the other three mixtures yielded nearly 
the same as the averages of the same grains grown alone. Under 
the conditions of the experiment the growing of grain mixtures 
would not be advisable. If the varieties of the different crops had 
very different habits or periods of growth, increased yields from 
mixtures might be expected, but this would be offset by the difficulties 
and losses in harvesting. 
WHEAT AND FLAX MIXTURES. 
The experiments with mixtures of wheat and flax were begun in 
1916. After the crops had emerged the severe soil blowing early in 
May destroyed nearly all of the flax plants, both in the mixtures and 
where sown alone. Most of the wheat plants survived, but the mix- 
ture experiment was of no value. The mixtures of wheat and flax 
were again sown in 1917 and 1918. The flax % Damont, C. I. No. 3, 
was sown at the rate of 15 pounds per acre, whether mixed with 
wheat or sown alone. 
The wheat, Marquis, C. I. No. 3641, was sown at the rates of 37 
pounds and 75 pounds per acre alone and mixed with flax. The 
almost total absence of weeds from the plats made the experiment 
of less value, because the object of the mixture of wheat and flax 
is to overcome or replace weeds. The relative quantities of wheat 
and flax produced in the mixtures were determined only in 1917. 
