12 BULLETIN 1276, U. S. DEPARTMENT OF AGRICULTURE 
ACRE YIELD 
The yields from the principal winter-wheat varieties under ex- 
periment are shown for each station. Unimportant varieties that 
were grown for only one or two years in the early part of the experi- 
ments are not included in the station tables, and all varieties grown 
less than three years are omitted from the summary table on yields. 
The annual and average yields obtained from winter-wheat varie- 
ties grown in plats at each of the 15 stations are shown in Tables 
3 to 18. Where more than one plat was grown the number of plats 
of each variety is stated in the text. The difference between the 
average yield of each variety in the years grown and that of the 
arkof variety in the same years, together with the odds of the 
difference recurring in more extended experiments, is recorded. Fi- 
nally, the yield of each variety in percentage of that of Kharkof is 
shown. 
GREAT PLAINS AREA 
Yields were obtained from the hard red winter-wheat varieties at 
10 experiment stations in the Great Plains area. The stations are 
arranged by States and in general from south to north. The winter 
conditions are too severe for winter wheat to be generally grown in 
the vicinity of the stations in North Dakota, South Dakota, and 
Wyoming, but in the sections where the other stations are located 
winter wheat is an important crop. 
RESULTS AT AMARILLO, TEX. 
The Amarillo Cereal Field Station was located in the center of the 
Texas Panhandle on a chocolate clay-loam soil at an altitude of 3,676 
feet. The average annual precipitation for 28 years was 20.81 inches. 
The experiments were conducted by the Office of Cereal Investiga- 
tions in cooperation with the Amarillo Chamber of Commerce. The 
yields of the winter-wheat varieties at Amarillo are shown in Table 3. 
The varieties were grown in single plats from 1906 to 1915, in 
duplicate plats in 1916, and in triplicate plats from 1917 to 1919. 
All of the experiments were conducted on summer-fallowed land. 
The crop of 1907 was heavily damaged by hail. Drought was 
largely responsible for the complete failure of the 1918 crop and for 
the very low yields in 1909, 1911, 1913, and 1916. The average yields 
of all varieties are very low. The 14-year average yield of the standard 
Kharkof was 9.5 bushels per acre. This variety was outyielded by 
several of the other hard red winter varieties. Turkey, C. I. No. 
2223, produced an average yield of 2.4 bushels per acre more than 
Kharkof in 13 years. Kanred, in a 3-year period, of which one year 
was a failure, exceeded Kharkof by 3.2 bushels per acre, or 40 per 
cent. Nebraska No. 28, a soft red winter variety, showed the next 
highest comparative yield, but, hike Kanred, was harvested in only 
two seasons. ‘Two other soft red winter wheats, Mammoth Red and 
sere co ercauead produced slightly larger average yields than 
arkof. 
RESULTS AT HAYS, KANS. 
The Fort Hays Branch Experiment Station is located on a silty 
clay-loam soil at an altitude of 2,000 feet. During a 50-yeai period 
the average precipitation has been 22.96 inches. The experiments 
