s 
BULLETIN 1315, U. S. DEPARTMENT OE AGRICULTURE 
Results on two plats in 3-year rotations in which winter. 
wheat is sown on disked oat stubble are available for the seven 
years from 1917 to 1923, inclusive. During this period the wheat 
sown on the unplowed oat stubble averaged 8.5 bushels per acre, 
while that sown on early-plowed wheat stubble averaged 6.6 bushels 
per acre. 
Recent results indicate that the use of the furrow drill may con- 
tribute materially to success with winter wheat in this region and 
that it may be possible to work out cultural methods by which the 
losses from soil blowing and winterkilling can be substantially 
reduced. 
RESULTS WITH OATS 
The area devoted to oats in Wyoming in 1923 was 175,000 3 acres. 
This acreage is about the same as that of spring wheat. In the dry- 
farming districts of the State this crop is produced chiefly for local 
feeding, and the straw is an important factor. In Laramie County, 
where dry farming is most extensive, there is a tendency to use some 
of the common forage millets in place of oats for hay. 
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Fig. 4. — Average acre yields of oats grown by different methods at the Archer Field Station for the 10 
years from 1914 to 1923, inclusive. The average following flax, spring plowed, is for the 9 vears from 
1915 to 1923, inclusive 
The annual and average yields of oats by different rotation and 
tillage methods at the Archer Field Station for the 10 years from 
1914 to 1923, inclusive, are given in Table 4, and the average yields 
are shown graphically in Figure 4. The 10-year average yield was 
only 16.9 bushels per acre. In 1915, 1917, and 1918 the yields from 
nearly all methods were good; in 1914, 1920, 1921, and 1923 fair yields 
were produced by some methods, but the averages were low; and in 
the other three years, 1916, 1919, and 1922, the crop was either very 
poor or failed entirely. 
The highest average yields of oats were produced following corn. 
Nine plats on disked corn ground averaged 20.3 bushels for the 10 
years under study. Exactly the same average yield was produced 
by three plats on spring plowing following corn. The superior 
behavior of oats on corn ground emphasizes the place corn occupies 
in the production of small grains. A plat of oats on disked corD 
ground in 1923 is shown in Figure 5. The yield of this plat was 26.6 
3 U. S. Denartment of Agriculture. Statistics of important crops bv States, 1921-1923. Oats. In 
Weather, Crops, and Markets, v. 4, p. 673. 1923. 
