BARLEY IN THE GREAT PLAINS AREA. 7 
torn line of the first half of the table gives the averages of all plats 
for each year, the average of the yearly average yields appearing in 
the last column to the right. 
In the second part of the table for each station the yields arc brought 
together to show the average yields by years for each method and the 
average yield for the entire period for each method. The computa- 
tions of cost and profit are founded on the basic data shown in Tables 
II, III, and IV. The value of the average yields by each method is 
calculated. The last line of the table gives the average profit or loss 
resulting from the production of barley by the method stated at the 
head of the column. Loss is indicated by the minus sign. This 
study deals with only the one crop and does not take into considera- 
tion the relative profitableness of other crops or of all crops, considered 
as a whole, in the farming system. 
Throughout the tables, where barley follows barley under any 
treatment, it is in a sj^stem of continuous cropping to barley by the 
method indicated. 
The methods of operation have been similar at all stations. Fall 
plowing is done as early as practicable after harvest. It is done to a 
good depth, the standard being set at 8 inches. Ground may be either 
worked down or left rough over winter. Where barley follows barley 
after spring plowing, the stubble is undisturbed until spring, when it 
is plowed shallow, usually to a depth of 4 inches, and given a mini- 
mum of cultivation, which usually consists of one or two harrowings. 
In those cases where an additional plat appears under the heading 
"Spring plowed," it is plowed deep instead of shallow. 
Under the subhead " Listed" there is shown at some stations the 
yield from one plat continuously cropped to barley. Instead of plow- 
ing this plat, it is furrowed out with a lister at the time of fall plowing. 
It is cultivated down level by seeding time. 
Under the subhead "Subsoiled" there is shown at the stations 
where it has been tried the results of a plat continuously cropped to 
barley. At the time of plowing, a subsoil plow is run in the bottom 
of the furrow, usually loosening the soil to a total depth of about 14 
inches. The variation from this depth is hardly more than 2 inches 
either way. In general, subsoiling has been done for two years in 
succession and omitted for two years. 
Under the subhead " Disked" are given the yields obtained on 
corn stubble prepared by disking. The corn is harvested in the fall 
with a corn binder and no tillage given the plat until spring. Then 
it is disked to put it in condition for seeding. 
Under the subhead " Green manured" are given the yields of 
barley following the plowing under of rye or peas, as specified. This 
treatment is in a 4-year rotation in which one of the other crops 
consists of corn and one of small grain. 
