28 
BULLETIN 219. IT. S. DEPARTMENT OF AGRICULTURE. 
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Figure 6, prepared from Table VIII, shows graphically the average 
relative profit or loss attending the use of each of the five methods at 
each of the stations. 
Table XVIII, illustrated in part in figure 4, shows that during the 
years covered by this work creditable average yields of grain have 
been obtained by all methods at Huntley, Wiliiston, Dickinson, 
Scottsbluff, North Platte, and Akron, and by one method at Belle 
Fourche and Dalhart. No grain has been produced either at the 
Judith Basin Field 
Station or at Garden 
City. 
Little difference is 
shown in the average 
yields of grain by the 
different cultural 
methods in use at 
Wiliiston, Edgeley, 
Hays, and Amarillo. 
At Dickinson, Belle 
Fourche, and Dalhart 
the only method of 
preparation giving 
yields departing far 
from the others has 
been that of summer 
tillage. At Dickinson 
summer tillage has 
been responsible for 
a decrease in yields 
and at Belle Fourche 
and Dalhart for an 
increase. 
Between the yields 
following fall and 
spring plowing little 
general difference is 
to be noted, except 
that at Huntley fall plowing has been better than spring plowing, and 
at Scottsbluff fall plowing after corn has been better and fall plowing 
after small grains poorer than spring plowing after either. At some 
stations more difference is to be noted as a result of crop sequence 
than as a result of difference in time of plowing. At Huntley corn 
has been better after small grain than after corn. At both North 
Platte and Akron corn after corn by both fall and spring plowing 
has been markedly better than corn after small grain. 
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Fig. 4 
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Graphs showing the average yields of corn in bushels per 
acre by different methods at eleven field stations in the Great 
Plains area. The methods of tillage are indicated by Arabic 
numerals at the top, as follows: 1, Fall plowing after corn; 2, fall 
plowing after small grain; S, spring plowing after corn; 4, spring 
plowing after small grain; 5, summer tillage. The field stations 
of Judith Basin and Garden City do not appear, because the corn 
grown at these stations produced no grain. 
