94 BULLETIN 480, U. S. DEPARTMENT OF AGRICULTURE. 
from the May 1 seeding. The results to date indicate that fairly 
early spring sowing is to be preferred. 
COMPARISON OF WINTER AND SPRING WHEATS. 
In comparing the results from winter wheats, durum wheats, and 
spring common wheats it is observed that (1) better yields were 
obtained in 1913 from winter wheats, yet the difference in yield of the 
leading varieties of winter and spring wheat was not very great. (2) 
Better yields were obtained in 1914 from the spring wheats, the 
winter wheats being severely winterkilled. (3) In 1915 winter-wheat 
yields were much higher than those of spring wheat. (4) The 
average yields of the winter wheats in the years 1913, 1914, and 1915 
are higher than those of any of the spring-wheat groups. (5) Durum 
wheats stand next to winter wheat when ranked according to yield. 
(6) Winter wheats undoubtedly will give higher yields than spring 
wheats if winterkilling is not too severe. 
The annual and average yields of some of the leading varieties of 
winter and spring wheats for the three years, 1913 to 1915, are shown 
in Table XV. 
TaBLE XV.—Annual and average yields of the leading varieties of winter, durum, and 
spring common wheats grown on the Cheyenne Experiment Farm, 1913 to 1915, 
inclusive. 
Yield per acre (bushels). 
Group and variety. | ee d i 
= 3-year 
| 1913 1914 1915 average. 
WINTER WHEAT. | | | 
 Ghirka AVVELITG OT: 5 eee, mele aoe sty ae LC ee pe 1438 | 9.3 7.8 37.6 18.2 
Crimean: | 
URGE eNO) by Cet NE MN pit ae) Ags ON a SUG Se gt 1442 9.8 4.7 37.1 172 
SPRING WHEAT ; 
Durum: , 
Bel Ou UT Kae eee tee ce reer LON RS ALPE Sievers Nea nen geo 1520 Well 11.9 28.9 16.2 
Common: 
IST yu Se eerie Shey OO tice hod oles er 2397 9.4 9.5 22.0 13.6 
TAOS Use UE Ni GR Re Ee INA LE cl eet regtne yo 2398 | @7.9] 610.3 Dike) 13.1 
Marquis OEE IS BAUER OE SARC Sr PIGS GIG Salary eee 3641 9.0 8.4 20.9 12.8 
a Average of 2 tenth-acre plats. b Average of 3 tenth-acre plats. 
The average yields of winter and spring wheat are not strictly 
comparable, since the winter wheats were grown on fallow in 1915, 
while the spring wheats were grown on disked corn ground. 
It appears that it may be more profitable to grow spring wheat, 
especially the durums, after corn if the corn crop is profitable for 
forage. It may be cyst also to grow winter wheat after corn, 
but data are not available at present. More data must be obtained 
before it will be possible to say whether winter or spring wheat is the 
more profitable. The average yields of the leading varieties of each 
group of wheats are shown graphically in figure 9. 
_ 
