CEOP PRODUCTION IN THE GREAT PLAINS AREA. 21 
not been sufficient from any method to pay the cost of producing the 
crop. 
When a value, believed to be a conservative one, is assigned to the 
fodder, both crops show a profit from nearly all methods under trial 
at all the stations. The only two exceptions are milo following milo 
by spring plowing at Garden City and kafir by summer tillage at 
Amarillo. This latter has been on trial for only three years, all of 
which have been relatively unfavorable. At Garden City and at 
Amarillo the yields of both grain and fodder from both milo and kafir 
have been greater following small grain than following themselves 
on fall plowing. At Dalhart the reverse has been true except in the 
case of kafir forage. 
Fall plowing has generally been a better preparation than spring 
plowing for both crops. At Amarillo the results with milo show little 
difference. 
The yields following listing have not generally departed far in 
either direction from those on similar land spring plowed. The most 
marked departure is an increase in the yield of kafir as a result of 
listing at Dalhart. 
Summer tillage as a preparation for these crops was not included 
in the experiments as originally outlined for Garden City. This 
defect has been remedied, but results of value have not yet been 
obtained. At Dalhart it has been the most productive and profitable 
method under trial. At Amarillo this method has been under trial 
for only three years. The results presented are not comparable with 
those from other methods. The data at hand indicate that marked 
increases in yields may be expected. 
TILLAGE PRACTICES. 
In the preceding pages data have been presented and discussed on 
each crop separately. The data and the experience gained and 
observations made during the investigations indicate that certain 
tillage practices are more or less general in their application. These 
will now be considered in their general application without reference 
to individual crops. 
PLOWING AND ITS SUBSTITUTES. 
In these investigations it has been assumed that the land should 
always be plowed for all crops following small-grain crops, except 
when it is ridged with a lister in the fall and cultivated down level 
in the spring without the use of the plow or when cultivated crops are 
planted with the lister. The practice of disking in small-grain crops 
on the stubble of the previous small-grain crop without plowing has 
not been tested sufficiently to warrant any definite recommendation 
at this time. This is a method that is sometimes resorted to in some 
