WINTER-WHEAT PRODUCTION AT FORT HAYS STATION. ayil 
The results of experiments with sod crops in rotations show them 
to be relatively unsuccessful themselves. Alfalfa is more successful 
than brome-grass, but is very depressing in its effect upon following 
crops. Wheat after corn averages about the same as the better 
methods of wheat after wheat. Kafir produces heavier yields of 
both grain and forage than corn, but wheat can not be sown imme- 
diately after kafir without great reduction in yield. The depressing 
effect of kafir is, however, eliminated by a single year of fallow or 
cropping. Parley, which is spring sown, follows kafir as well as it 
does other crops and produces relatively good yields. Winter wheat 
follows barley as well as it does wheat or other crops. This establishes 
in the rotation a place for barley between kafir and winter wheat. 
The use of barnyard manure at different rates and in different posi- 
tions in 3-year rotations of kafir, fallow, and winter wheat for the 
8-year period from 1913 to 1920, inclusive, has not had a measurable 
effect upon the yields of either wheat or kafir. 
The experiments do not indicate that a reduction of the proportion 
of wheat to other crops would necessarily result in an increased aver- 
age yield per acre of wheat. They do indicate, however, that the 
present average yield per acre is not as high as it should be. The 
most fertile field for the control of yields is the 90-day period between 
harvest and seeding. The more completely this is made a cultiva- 
tion period the higher will yields rise above the minimum at which 
they now rest. An increase of 50 per cent is not impossible, and 
some part of it should be realized through greater timeliness and 
efficiency of operations. 
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