10 
BULLETIN 1315. U. S. DEPARTMENT OF AGBICULTURE 
The lowest yields were from land cropped continuously to oats. 
One plat was subsoiled and averaged 9.3 bushels, one was listed 
and averaged 9.5 bushels, one was fall plowed and averaged 10.4 
bushels, and one was spring plowed and averaged 11.9 bushels per 
acre. The subsoiled plat in 1923 is shown in Figure 6. Compare 
the growth on this plat, which is representative of those continuously 
cropped to oats, with the much heavier growth following corn shown 
in Figure 5. 
Spring plowing is generally superior to fall plowing as a prepara- 
tion for oats. 
The 10-year average yield on alfalfa sod was 13.5 bushels and on 
brome-grass sod 12.4 bushels per acre. 
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Fig. 6.— Oats at the Archer Field Station in 1923 on land subsoiled and continuously cropped to 
oats; yield, 3.4 bushels per acre. Compare with Figure 5 
RESULTS WITH BARLEY 
The acreage of barley in Wyoming is small, but there is continued 
and increasing interest in the crop. The rotation and cultural 
experiments contain but eight plats of barle}~. The annual and 
average yields of these plats are given in Table 5. Six of the plats 
were started a year later than the other work, and averages are com- 
puted for the nine years from 1915 to 1923, inclusive. The average 
yields for this period are shown graphically in Figure 7. These 
averages are comparable with the 10-year averages of other crops, 
as the yield of barlev in 1914 was very nearly normal. 
The average yield of the eight plats for nine years was only 12.6 
bushels per acre. Tne heaviest yielding method under trial was 
summer fallow, on which the yield averaged 18.6 bushels per acre. 
The next highest yield, 15.1 bushels, was on disked corn ground. 
A plat on spring plowing following oats in a 3-year rotation 
averaged 14.2 bushels per acre. The lowest yields were on the four 
plats cropped continuouslv to barley. The spring-plowed plat in 
this series averaged 12.3 bushels, the listed plat 10.3 bushels, the 
fall-plowed plat 9.3 bushels, and the subsoiled plat 9.1 bushels per 
acre. With barley, as with other crops, spring plowing yielded 
higher than fall plowing, and no advantage was gained by subsoiling. 
