16 BULLETIN 297, U. S. DEPARTMENT OF AGRICULTURE. 
ence in yield between the durum and common varieties that appears 
plausible is that the durum wheats bloomed during a hot, dry period, 
about June 20, while most of the common varieties bloomed about a 
week later, when weather conditions were more favorable. Low 
yields of durum wheat were obtained at several stations in the Great 
Plains in 1910 and 1911, and in every case it was noted that the durum 
varieties bloomed during a hot, dry period. This matter has been 
discussed more at length by the writer in another publication. 
The crop season of 1911 was so dry that spring grain sown at the 
usual time did not germinate till August. Table II shows that the 
total precipitation from March to July, inclusive, was only 2.01 
inches and that, with one exception, this precipitation came in such 
small showers that 1t was of no value in promoting crop growth. No 
yields of any of the cereals were produced that year. 
The soil was so dry in the spring of 1912 that only small yields were 
produced that year, even though the precipitation was nearly normal. 
The rainfall during May and June was light, and this factor con- 
tributed further toward the partial failure of the crops. In that year 
all the replicated plats of only two varieties of spring wheat, the 
Ghirka and Manchuria, were harvested. Only single plats of the - 
Changli and Marquis were grown; these produced the yields shown in 
Table IX. None of the other varieties produced enough grain to har- 
vest. All four of the varieties which matured grain in 1912 are early 
and so in a measure escaped the effect of the drought. 
In 1913 five fiftieth-acre plats of each variety were sown, but on a 
portion of the area the germination and growth were not at all uni- 
form, probably due to the replowing of the land the previous summer 
to eradicate gumbo weed. Two plats of each variety were sown on 
land which received uniform treatment, so the results from these plats 
only are included in Table IX. 
Two plats of the Galgalos wheat, C. I. No. 2398, a beardless variety 
with short, stiff straw and a rather large, soft, white kernel, were 
grown on land not entirely comparable with that on which the varie-. 
ties shown in Table [X were sown. Plats of the Kubanka and Power 
were grown, however, on the same area. The Galgalos produced an 
average yield of 17.5 bushels, the Kubanka 18.1 bushels, and the 
Power 14.3 bushels. 
SUMMARY OF YIELDS OF SPRING WHEAT. 
Of the numerous varieties of spring wheat grown at Newell, only 10 
have been included in the test for the entire period of six years. Of 
these 10 varieties, 5 are durum and 5 are common wheats. Of the 
common wheats, 3 belong to the Fife group, 1 to the bluestem, and 1, 
1Salmon, Cecil. Sterile florets in wheat and other cereals. Jn Jour. Amer. Soc. Agron., v. 6, no. 1, 
p- 24-30, 2 pl., 1914. 
i se aeiie ie cont? eae 
