DRY FARMING IN" SOUTHEASTERN WYOMING 15 
crop that immediately follows the peas and is not evidenced in other 
crops in the rotations or in a cumulative effect in succeeding rounds of 
the rotations. 
It is evident from the results that have been presented that, in de- 
termining what crop to sow, attention should be given to the crop that 
was last grown as well as to the preparation of the seed bed. The 
results show that up to the present time the crops have been little 
affected by the cropping or treatment further removed than one year. 
This leads to the conclusion that practically the full effect of rotation 
is realized in rotations only two years in length. It may, however, be 
necessary in planning the cropping system to make longer combina- 
tions than this. It is generally a good practice to have a fairly defi- 
nite plan of cropping arranged, so as to distribute labor in such a 
manner that as many acres as possible can be handled with a given 
unit of men, teams, and machinery. The production of corn on a por- 
tion of the farm accomplishes this to a large extent. 
CROP RESISTANCE TO DROUGHT, DISEASE, AND STORM 
The success of farm operations often depends upon the resistance 
of crops to adverse conditions, such as drought, disease, and severe 
storms. For these reasons the spring wheat most commonly grown 
in the immediate vicinity of the station is durum. The results of 
Fig. 9.— Kota spring wheat (at right) and Converse spring wheat (at left) at the Archer Field Station. 
Converse was nearly destroyed by black stem rust, but Kota was little affected. Photographed Sep- 
tember 15, 1923 
recent years have emphasized the necessity of rust-resistant cereals. 
Kota is recommended for a spring common wheat and Kanred for a 
winter variety. Figure 9 shows the variety-test plats of Kota and 
Converse wheat in 1923. Note how the latter had fallen from the 
effects of black stem rust, whereas the former was little affected. 
Acme is the highest yielding rust-resistant durum wheat, but it does 
not produce macaroni of satisfactory quality. Peliss has been found 
well adapted to the higher altitudes in Wyoming, yielding nearly as 
well as Acme. 6 Corn by its manner of growth and culture generally 
evades the drought. Severe hailstorms sometimes injure it greatly, 
6 Clark, J. A., Martin, J. H., and Smith, R. W. Varietal experiments with spring wheat on the northern 
Great Plains. U. S. Dept. Agr. Bui. 878, 47 p., illus. 1920. 
