CROP ROTATION AND CULTURAL METHODS AT AKRON, COLO. 15 
averaged 64.3 bushels per acre; and the lowest was in 1918, when 
most methods failed entirely and the highest yielding method 
averaged only 7.7 bushels. 
The yields of oats following different crops and cultural treatments 
are given in Table 7 and shown graphically in Figure 7. 
The outstanding method in point of yield is summer fallow, which 
has a 15-year average of 31.8 bushels per acre. In spite of the fact 
that it is the highest yielding method, it would not be advisable to 
raise oats on fallow. In comparison with other crops a relatively 
greater return was obtained by winter wheat, which averaged 19.1 
bushels per acre on fallow, and in comparison with other preparations 
the yield of oats is not enough greater on fallow to warrant use of 
fallow for that crop. 
Two plats on spring-plowed corn ground averaged 25.4 bushels 
per acre, and seven plats on disked corn ground averaged 24.2 bushels. 
On spring plowing following wheat the average yield of oats was 22.7 
bushels and on spring plowing following oats it was 22.6 bushels per 
acre. 
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Fig. 
Average yields of oats obtained under different tillage methods at the Akron Field Station 
for the 15 years from 1909 to 1923, inclusive 
The yields on fall plowing, listing, and subsoiling were all below 
the yields on spring plowing following the same crops. There are 
marked fluctuations or yearly differences in the relations of these 
methods, but in the average of a series of years the differences are 
not great enough to be the determining factors in choosing between 
them. Choice between them is based on economy in the distribution 
of labor and the conditions under which the work may be done. 
The subsoiled plat is directly comparable with the fall-plowed plat 
on which oats is the preceding crop. It differs from it only by the 
subsoiling. The difference between the average yields of the two is 
only a fraction of a bushel and is well within the limits of error. 
The yields following disked sorgo, kafir, and milo are distinctly 
lower than those following corn. 
The yields following green manures are lower than those following 
fallow. The yield following rye as a green manure is about the same 
as that following corn, but the yields following peas and following 
sweet clover plowed under for green manures are only equal to those 
following a harvested crop of grain. 
