20 
BULLETIN 618, U. S. DEPARTMENT OF AGRICULTURE. 
to 25.6 bushels, while the 5-year average yields of four varieties 
ranged from 11.2 to 13.7 bushels. This shows that in the event of 
great damage to the winter-wheat crop in autumn or winter the loss 
might be retrieved in a large measure by sowing durum wheat the 
following spring. 
RESULTS AT MANHATTAN, BANS. 
Manhattan is located, according to Table II (p. 15), on a dark- 
brown silt-loam soil at an altitude of 1,014 feet. The normal annual 
rainfall, based on a 56-year record, is 32.6 inches. The experiments 
were conducted independently by the Kansas Agricultural Experi- 
ment Station, and the results are copied from Bulletin 144 (Ten Eyck 
and Shoesmith, 1907) of that station. The results are shown in full 
in Table IV and graphically in figure 8. 
Table IV. — Annual and average yields of two varieties of durum wheat and four varieties 
■of common xvheat grown at the Kansas' Agricultural Experiment Station, Manhattan, 
Kans., during periods of varying length in the four years from 190S to 1906, inclusive. 
Yield per 
acre (bushels). 
Class, group, and variety. 
1903 
1C04 
1C05 
Average. 
1906 
2 years, 
1903 and 
1904. 
3 vears, 
1904 to 
1906. 
Durum: 
Kubanka — Gharnovka 
13.3 
12.0 
11.1 
7.0 
34.9 
5.3 
6.1 
1.9 
12.2 
9.5 
Velvet Don — Velvet Don 
18.0 
38.6 
12.8 
46.9 
12 6 
Common: 
Crimean — Turkey (No. 4) 
40.1 
Fife— Glvndon 
9.6 
7.0 
7.0 
7. 5 
6.6 
4.5 
Since Manhattan, like McPherson, lies in the heart of the Crimean 
winter-wheat belt, the experiments are of brief duration, as not much 
could reasonably be expected of spring-wheat varieties. Table IV 
shows the comparative yields in the years 1903 and 1904 of two 
durum varieties and of three spring common wheats belonging to 
three different groups. It is seen that both durums exceed any of 
the spring common varieties in yield. The Turkey variety of the 
Crimean winter group, however, outyields the best durum grown in a 
ratio of 3 to 1. In the favorable year 1905, in which one of the 
durum varieties was still under experiment, its high yield of 18 
bushels was less than half that of Turkey, 38.6 bushels per acre. 
RESULTS AT LINCOLN, NEBR. 
The Nebraska Agricultural Experiment Station is located on an 
alluvial clay-loam soil at an altitude of 1,189 feet above sea level. 
The normal precipitation is 27.5 inches. The experiments at Lincoln 
were conducted independently by the Nebraska Agricultural Experi- 
