50 BULLETIN 698, U. S. DEPARTMENT OF AGRICULTURE. 
5 originally under experiment. The total number of plats grown in 
the nine years has been 105. The results are shown in Tables XVI 
and XVII, and the best strains are compared with others of the milo- 
durra group in Table XVIII. Beginning in 1910, an attempt was 
made to isolate both black-glumed and white-glumed selections from 
some of the selections which were not homozygous for glume color. 
From a study of the data in Table XVI it appears that the selec- 
tions of 198, 237, and 240 are early in maturing and the selection 
No. 240-6 especially so. The average duration of the growing period 
hes between 100 and 110 days in fairly normal seasons. In 1914. 
when all varieties of grain sorghums matured quickly, No. 240-6 
matured in 87 days, and none of the six selections required more than 
97 days to mature. In 1915, when all grain sorghums were late, these 
selections required only 118 days on the average, or a little less time 
than milo. 
The germination of these hybrid selections has been Bonde on the 
average. Only once in the nine years has the plant space exceeded 
15 inches. In five of these years the plant space has averaged less 
than 10 inches and in one year less than 5 inches. In the very dry 
spring of 1910 the germination was poor and the average space was 
25.6 inches. In 1915, however, with its very wet spring, the average 
spacing was only 10.4 and 15.2 inches for the two subgroups, respec- 
tively. These selections do not tiller as freely as their kafir parent, 
but a little more freely than the durra parent. Only once, in 1910, 
have half of the stalks been suckers and only three times have as 
many as 30 per cent been suckers. The lowest record is 19.2 per 
cent, in 1911. The average height has been 4 feet. 
The yields of all varieties are given in Table XVI and the yields | 
of the best strains or races in Table XVII. No fair comparison can 
be made by considering the average acre yield of all the selections 
in all the years, because these are widely varying hybrid forms 
instead of pure-line selections from a mass variety. It is necessary, 
therefore, to determine the average acre yield of each of such selections 
as have been srown throughout the 9-year period. There are only 
three of them, but there are two others that were separated from 
two of the ales three after the experiment had run two years. 
There is still another, No. 240-6, which has been grown during thé 
last six years. 
As grown during 1908 and 1909, both black-glumed and white- 
glumed forms occurred in the electrons of No. 198. In the autumn 
of 1909 selections were made for glume color, and in 1910 head rows 
of each color were sown. ‘The yields recorded in 1908 and 1909 are 
from the mixed lots, and hence are identical in both sections of the 
table. The subsequent yields are those given by the different 
selections. 
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