18 BULLETIN -tOO, U. S. DEPARTMENT OE AGRICULTVRE. 
The length of the growing season varies with the altitude and 
latitude. The frost-free period decreases from about 130 days in the 
lower portions to about 90 days at the higher elevations, In general. 
early and drought -resist ant varieties have an advantage in escaping 
hot winds, drought, and frost. A brief popular classification and de- 
scription of the important groups of hard spring wheat and the 
leading varieties in each group is already available. 1 
RESULTS AT XORTH PLATTE, XEBR. 
The experiments reported hi Table IX were conducted independ- 
ently by the Nebraska Agricultural Experiment Station, and the 
results are made available here through the courtesy of the director 
and other officers. They have been continued through the 3-year 
period. 1913 to 1915. inclusive. 
Table IX shows that the Turkey wheat, a hard red whiter variety, 
largely outyields all the spring wheats. The advantage of the Turkey 
over Kubanka Xo. 1. a durum wheat and the highest yielding spring 
variety, is 54 per cent. The durum varieties slightly outyield the 
Marquis, while the durums and the Marquis all outyield the Preston. 
It is unfortunate that no other variety of the Fife group has been 
grown at Xorth Platte. The results in hand do not show whether 
or not the Marquis would outyield other Fife wheats. 
Table IX. — Annual and average yields of the Marquis and fix e other varieties of wheat 
grown at the Xorth Platte substation, 1913 to 1915. inclusive. 
[Data presented, through the courtesy of the Nebraska Agricultural Experiment Station.] 
Yield per acre (bushels). 
Group and variety. 
1913 1914 1915 Average. 
File: 
Marquis 
Crimean"( winter ) : 
Turkev » 17.3 
Kubanka and Kahla (durum): 
Kubanka Xo. 1 '■ 7. 7 
Kubanka 2 7.9 
Kahla 9.8 
Preston: 
Preston 3 3. 
4.3 20.2 
8.0 31.1 
3. 9 2-5. 1 
2. 3 21. 6 
2. 9 19. 2 
3. 6. 6 
10.4 
18.8 
12.2 
10.6 
10.6 
> Average yields from nine plats in the rotations of the Office of Dry-Land Agriculture Investigations. 
- Average yield of two plats. 
3 This variety was grown under the name " Scotch Fife." 
RESULTS AT AKRON, COLO. 
At Akron, Marquis wheat has been compared with other winter and 
spring varieties during the 3-year period, 1913 to 1915, inclusive. 
The annual and average yields are shown in Table X. and the average 
results appear graphically in figure 6. 
i Ball, C R., and Clark, J. A. Varieties of hard spring- wheat. T\ S. Dept. A:r.. Farmers' Bui 
1 Bg. 1915. 
