CEREAL EXPERIMENTS AT THE AKRON FIELD STATION. 19 
Taste XII.—Annual and average yields of Kharof winter wheat in a date-of-seeding 
test at the Akron Field Station, Akron, Colo., in 1911, 1913, 1914, and 1915. 
Yield per acre (bushels). 
Date of seeding. 
1911 1913 1914 1915 | Average. 
Septal GCs 0 SIMCIUISIVO seers Ss - anche act aoe mae. oocs see 15.5 15.6 26.0 27.3 21 
Oct ito syinclusivess.ssee ls soe ee oe oes se, 16.1 15.6 26. 6 34.2 23.1 
Weiz Gt OmleinClNSiviere seer ae kt Beene as Sao emacs senate once 12.6 1153 25.8 216.6 
ENON Ent OFS0 5,11 CLUSIVON tae, naan ee cess wise ewes uo s ee 16.5 8.6 13.6 26. 6 15353 
a Three-year average. 
The sowings made during the first 15 days in October have given 
yields as high as or higher than those from any other date of seeding 
during the last three years of the test. In 1911 an early sowing 
(Sept. 6) gave the highest yield, 16.8 bushels, and a late sowing 
(Noy. 11) ranked second. The average of the yields from sowings 
made between September 15 and October 15 is 22.1 bushels, which 
is 5.5 bushels higher than the yield from sowings made during the 
following 15-day period. 
SPRING WHEAT. |! 
Spring wheat is an important crop in this section of the Great 
Plains. It can be sown early on land prepared during the late fall. 
It has given good yields when conditions were favorable. The vari- 
eties which have given the highest yields are durum wheats. In 
addition to the varietal experiments, a rate-of-seeding test has been 
conducted with Arnautka durum wheat since 1911. 
VARIETAL EXPERIMENTS. 
| Experiments with spring wheat have been conducted both on field 
- plats and in the nursery. These will be discussed separately. 
PLAT EXPERIMENTS. 
A total of 44 varieties of spring wheat have been grown in field 
plats for one year ormore. Table XIII shows the annual and average 
yields of these varieties, arranged in groups according to their rela- 
tionships. 
Seven varieties of durum wheat have been grown continuously 
during the eight years. Pelissier (C. I. No. 1584) has given the 
highest average yield, 22.4 bushels per acre. Velvet Don (C. I. No. 
1445) ranks second, and Arnautka (C. I. No. 1493) is third. The 
fourth variety in rank is the Galgalos (C. I. No. 2398), a soft white 
common wheat which belongs to none of the groups grown commer- 
cially. Arnautka 6P1 (C. I. No. 4064) has given an average yield 
of 27.6 bushels per acre for the six years in which it has been grown. 
1 ¥or a discussion of the groups and varieties of hard spring wheat, see Ball, C. R., and Clark, J. A., 
Varieties of hard spring wheat. U.S. Dept. Agr., Farmers’ Bul. 680, 20 p., 7 fig. 1915. 
