EXPERIMENTS WITH DURUM WHEAT. 
21 
ment Station, and the data given in Table V are taken from publi- 
cations of that station (Lyon, 1903; Lyon and Keyser, 1905). The 
principal data are shown also graphically in figure 8. 
Table V. — Yields of seven varieties of durum wheat and three varieties of common 
wheat grown at the Nebraska Agricultural Experiment Station, Lincoln, Nebr., in 
1902. 
Class, group, and variety. 
Yield per 
acre 
(bushels). 
Class, group, and variety. 
Yield per 
acre 
(bushels). 
Durum: 
16.5 
14.5 
14.0 
12.5 
10.5 
7.5 
Durum— Continued. 
Kahla — Kahla 
7.3 
Common: 
Crimean (winter)— 
Turkey 
33.2 
29.2 
22.3 
As shown in Table V, the durum wheats were tested at Lincoln in 
but a single year, 1902. Lincoln lies in the heart of the hard winter- 
wheat belt, and spring-sown wheat can not compete with the varie- 
ties of the Crimean group. The average yield of the seven durum 
varieties is only 11.8 bushels, whereas the average yield of the three 
Crimean varieties is 26.2 bushels per acre. The yield of the best 
durum, Gharnovka, in the Kubanka group, is 16.5 bushels, whereas 
the yield of the best Crimean, Turkey, is 33.2 bushels per acre, or 
exactly double the yield of the Gharnovka. On the basis of known 
facts, there was no economic reason for continuing further a varietal 
experiment with durum wheat at Lincoln. 
RESULTS AT AMES, IOWA. 
Ames, Iowa, as seen from Table II, is located on the Marshall silt- 
loam soil at an altitude of 922 feet. The average annual rainfall 
for a 40-year period is 32.6 inches. The experiments cited were con- 
ducted cooperatively by the Iowa Agricultural Experiment Station 
and the Office of Cereal Investigations. 
Experiments including durum wheat cover the 5-year period from 
1906 to 1910, inclusive. The results are given in Table YI, and the 
principal ones are shown graphically in figure 8. 
Among the durums only Kubanka was tried, and the results are 
unfavorable when compared with those from the other varieties. 
None of the spring wheats does well, but all three of the spring com- 
mon varieties are better than Kubanka. As might be expected in 
central Iowa, winter wheat is much more productive than any 
spring wheat. The 5-year average yield of Turkey, of the Crimean 
group, is nearly 10 bushels higher than that of the best spring com- 
mon wheat. Durum wheats have no place in so humid a climate as 
that of central Iowa. 
