18 BULLETIN 1315, U. S. DEPARTMENT OF AGRICULTURE 
the growth the better it will resist soil blowing. The dates upon 
which this crop was seeded were August 15, September 1 and 15, 
October 1 and 15, and November 1. The average yields for the four 
years from 1918 to 1921, inclusive, for these dates were 18.9, 20.4, 
16.8, 10.2, 7.9, and 9.9 bushels per acre, respectively. It is obvious 
that September 1 is the preferable date of seeding. Seedings on 
disked oat stubble can be made earlier than this with profit, but on 
fallow there is likely to be some winterkilling from earlier seeding. 
Seedings of October 1 are seldom any better than seedings of a later 
date. It has been found that 3 pecks is sufficient seed on fallow, 
whereas 4 to 5 pecks is preferable on disked oat stubble. 
Figure 10 shows the crop of winter wheat on fallow seeded Sep- 
tember 1, 1920. The plat to the left was seeded August 15 and the 
one to the right on September 15. 
Fig. 10.— Winter wheat on fallow in 1921 at the Archer Field Station. Seeding of September 1, 1920, In 
center, seeding of August 15 at left, and that of September 15 at right 
SUMMARY 
The Archer Field Station is located near Cheyenne in southeastern 
Wyoming. The altitude is about 6,000 feet. The soil is typical of 
the upland soil of the region. The results of experiments in methods 
of crop production begin in 1913 and are reported to and including 
the year 1923. 
The average annual precipitation at the station for the 11 years 
from 1913 to 1923, inclusive, was 15.01 inches. The average annual 
precipitation recorded by the United States Weather Bureau at 
Cheyenne for the same period was 15.51 inches, and for the 53 years 
from 1871 to 1923 it was 14.17 inches. 
The average acre yield of spring wheat from all plats for the 10 
years from 1914 to 1923 was 10.9 bushels. The highest average yield, 
13.3 bushels, was following peas plowed under for green manure; but 
this method is too expensive to make it relatively profitable in com- 
parison with fallow or with disked corn ground, on both of which the 
yields averaged 11.8 bushels to the acre. The yields following small 
grains averaged from 7.4 to 9.3 bushels to the acre. 
Winter wheat is not a reliable crop. It was necessary to reseed all 
or most plats 7 years out of 10. The losses were due to winter- 
