12 BULLETIN 430, U. S. DEPARTMENT OF AGRICULTURE. 
INTERPRETATION OF EXPERIMENTAL RESULTS. 
The interpretation of the results obtained from plat experiments is 
difficult. This is due to the large number of factors which must 
be considered in determining the relative value of different varieties 
or different cultural methods. Generally speaking, the variety that 
gives the highest average yield of good quality in a period of several 
years is the one that should be grown. It is really quite difficult to 
obtain a variety that is consistently a high yielder and also is high 
in quality. Variations in soil and seasonal and annual variations in 
climate have a great influence on crop production in dry-land areas. 
All these factors must be thoroughly studied, in order that reliable 
conclusions may be drawn. The experiments at the Cheyenne 
Experiment Farm have been under way for only three years. This 
is too brief a period to give the needed long-time average of yields 
or to permit sufficient study of soul and climatic variations. 
EXPERIMENTS WITH WHEAT. 
At Archer, experiments with winter and spring varieties of wheat 
have been conducted in. field plats and nursery rows. Most of the 
work, however, has been done on field plats. Wheat is the leading 
crop in southeastern Wyoming. Spring and winter varieties are 
grown on about equal acreages. More work has been done at 
Archer with wheat than with any other cereal. 
WINTER WHEAT. 
Experiments with winter wheat have included varietal, rate-of- 
seeding, and date-of-seeding experiments. The work at Archer is 
relatively new. Therefore little has been done in the improvement 
of crop varieties. The work has been confined for the most part 
to the testing of varieties known to be the most promising for the 
dry-land districts. 
VARIETAL EXPERIMENTS. 
The varietal experiments with winter wheat on the Cheyenne 
Experiment Farm have included for the most part the hard, red win- 
ter varieties of the Crimean group. Seven varieties have been grown 
for three years, 1913, 1914, and 1915, while eight additional varieties: 
have been grown for two years, 1914 and 1915. The annual and 
average yields of winter-wheat varieties are presented in Table VI. 
In 1913, seven winter-wheat varieties and strains were grown in 
duplicate tenth-acre plats on sod that was broken in August, 1912, 
double disked twice, and harrowed. The plowing was poorly done 
and the seed bed was rather rough. The seed was sown on October 5, 
1912. The plants emerged on October 25, but made little growth 
before winter. The stands obtained were rather thin, but tillered 
