22 BULLETIN 219, U. S. DEPARTMENT OF AGRICULTURE. 
where corn follows corn as compared with corn following small grain 
is much greater in the grain than in the stover yields. Following 
sorghum there was a sharp decrease in yield. In rotations where 
corn followed oats on brome-grass and alfalfa sods the yield was 
considerably less than that obtained on similarly prepared land that 
had not been in sod. 
Land that was summer tilled the previous year produced six good 
crops of grain in the eight years under study. In the other two years 
it did not produce sufficient grain to warrant husking. During the 
six years the average yield of grain was about 2 bushels more and 
the yield of fodder about 300 pounds more per acre by summer tillage 
than that produced by spring plowing corn ground, the next highest 
yielding method. 
On spring-plowed corn ground the average value of the crop of 
grain alone has been more than sufficient to pay the cost of producing 
the crop. On fall-plowed corn ground the average value of the grain 
for eight years has lacked only 20 cents of paying the cost of pro- 
duction. All methods show a profit when a value is assigned to the 
stover or fodder. The profits per acre from the different methods have 
been as follows: Summer tillage, SI. 38; fall plowing after small 
grain, $2.12; spring plowing after small grain, $2.78; fall plowing 
after corn, $4.56; and spring plowing after corn, $5.17. 
AKRON FIELD STATION. 
Table XIII presents the results of the work of six years in methods 
of production of corn at Akron, Colo. All methods have produced 
fodder every year. Summer-tilled land has produced a grain crop 
every year, its average yield for the entire period being 20.9 bushels 
of grain and 2,257 pounds of stover per acre. Other methods have 
met from one to three more or less complete failures of the grain 
crop. The average yield of corn after corn by both spring and fall 
plowing, however, has been practically the same as on summer-tilled 
land. 
Corn after small grain was markedly poorer in yield of both grain 
and stover than corn following corn by either fall or spring plowing. 
Subsoiling the land where corn follows corn resulted in decreased 
yields every year as compared with fall plowing similar land without 
subsoiling it. Planting with the lister resulted in a still further 
decrease in yields. 
The difference in the results following fall and spring plowing are 
negligible when the average of the whole series of years is considered. 
Fall and spring plowing of land where corn follows corn are the only 
methods that show a profit from the grain crop alone. When a value 
is assigned to the stover, all methods show profits ranging from 51 
