18 



BULLETIN 400, U. S. DEPARTMENT OF AGEICULTL'EE. 



Tho 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-resistant 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.^ 



RESULTS AT NORTH PLATTE, NEBR. 



The experiments reported in Table IX were conducted independ- 

 ently by the Nebraska Agricultural Experiment Station, and the 

 results are made available here through the com-tesy 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 winter variety, 

 largely outyields all the spring wheats. The advantage of the Turkey 

 over Kubanka No, 1, a durum wheat and the highest yielding spring 

 variety, is 54 per cent. The durum varieties slightly outyield the 

 Marc{uis, while the dm-ums and the Marquis all outyield the Preston. 

 It is unfortunate that no other variety of the Fife group has been 

 grown at North 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 Jive other varieties of wheat 

 groivn at the North Platte substation, 1913 to 1915, inclusive. 



[Data presented through the courtesy of the Nebraska Agricultural Experiment Station.] 



Group and variety. 



Yield per acre (bushels). 



1913 



1914 



1915 



Average. 



Fife: 



Marquis 



6.8 



17.3 



7.7 

 7.9 

 9.8 



3.0 



4.3 



8.0 



3.9 

 2.3 

 2.9 



3.0 



20.2 



31.1 



25.1 

 21.6 

 19.2 



6.6 



10.4 



Crimean (winter): 



Turkey i ... 



18.8 



Kubanka and Kahla (durumj: 



12.2 



KubanJra ^ . 



10 6 



Kahla 



10.6 



Preston: 



Preston ' 



4.2 







1 Average yields from nine plats in the rotations of the Office of Dry-Land Agriculture Investigations. 



2 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. 



1 Ball, C. R., and Clark, J. A. Varieties of hard spring wheat. U. S. Dept. Agr., Farmers' Bui. 680, 20 

 p , 7 fig. 1915. 



