28 BUTJiETHg" 878, TJ. S. DEPARTMENT OF AGRICULTURE. 
than at Archer. The conditions of high altitude and northern lati- 
tude allow only a short growing season, and this combined with the 
low rainfall makes crop growing somewhat difficult. The experiments 
were started in 1913 and are conducted by the Office of Cereal Inves- 
tigations in cooperation with the Wyoming State Board of Farm 
Commissioners. In 1919 a change in the State law made the director 
of the Wyoming Agricultural Experiment Station the chairman of 
this board. The annual and average yields of the spring- wheat 
varieties are given in Table XI. 
During the 7-year period from 1913 to 1919, inclusive, durum 
wheat generally has outyielded common wheat, including the Mar- 
quis variety. The latter has yielded at the rate of 14.1 bushels per 
acre. It has outyielded the Power and Preston varieties and most 
of the Bhiestem strains by significant quantities. It has been out- 
yielded, however, by five varieties of common wheat. The Erivan 
and Galgalos have exceeded it in yield by the significant differences 
of 2.4 and 1.3 bushels per acre, respectively. These wheats have 
weak straw and for that reason have not been distributed commer- 
cially. The Norka variety has also outyielded Marquis by 1 bushel, 
Kitchener has outyielded it by 0.7 bushel, and Huron by 0.2 bushel 
per acre. These differences, however, are not significant. All of 
the durum wheats continued in the experiments except D-5 have 
outyielded Marquis. During the 7-year period the highest-yielding 
durum wheat was Kubanka (C. I. No. 1516), averaging 16.4 bushels 
per acre, followed closely in yield by Beloturka and Kubanka (C. I. 
No. 1440). The Peliss variety also has yielded fairly well, averaging 
15.3 bushels per acre. In the 3-year period from 1917 to 1919, 
inclusive, the Acme has given about the best results, outyielding 
the other rust-resistant durum varieties, Monad and D-5, by 1 and 
2.2 bushels, respectively. 
RESULTS AT NORTH PLATTE, NEBR. 
The North Platte substation of the Nebraska Agricultural Experi- 
ment Station is located in the valley of the South Platte River, just 
above the junction of the North and South Forks, near the town of 
North Platte. It lies at an altitude of 3,000 feet and is located on a 
porous clay-loam soil known as loess. The normal annual precipi- 
tation is 18.83 inches. Varietal experiments with spring wheat 
have been conducted at the North Platte substation by the Nebraska 
station for a number of years. Since 1915 Mr. L. L. Zook, of the 
Office of Dry-Land Agriculture, has had supervision of the experi- 
ments. The results since 1913 which are reported here have been 
furnished by Mr. Zook through the courtesy of the Nebraska Agri- 
cultural Experiment Station. The yields are shown in Table Xll. 
