76 BULLETIN 698, U. 8. DEPARTMENT OF AGRICULTURE. 
Table XX XI shows that the duration of the growing period has 
varied from 90 days, in 1915, to 121 days, in 1912. Their earliness, 
therefore, is comparable to that of the milo group and indicates some 
promise of usefulness in this particular line. 
The stand obtained has varied considerably in the different years. 
In 1910, when the spring was extremely dry, the stand was better 
_ than that. of any of the kafirs or milos. The poorest stand was 
obtained in the wet spring of 1915, when each plant had 42 inches 
of space and the sucker production of 31.3 per cent reduced the stalk 
space to only 29 inches. Sucker production in 1910 averaged 44 per 
cent of the total number of stalks, while the percentage in 1915 was - 
the next highest. ; 
The yield of Mukden (C. I. No. 190) is only 11.3 bushels per acre in 
the eight years for which the record exists, there being no record in 1908. 
The average acre yields of the two varieties in the five years from 1909 
to 1913, inclusive, in which both were grown, were only 11.7 and 
12.5 bushels, respectively. These yields are too small to be very — 
encouraging. Theyield of No. 190 in 1915, the year of bumper yields, 
was only 13.8 bushels per acre, due partly to the very thin stand, no 
doubt, but not indicating high productiveness under favorable con- 
ditions. The annual and 9-year average yields of White kaoliang 
are compared with those of other kaoliangs in Table XXXVI. 
THE BLACKHULL KAOLIANG SUBGROUP. 
This subgroup of kaoliangs is distinguished by black glumes and 
white kernels. Three different introductions have been under ex- - 
periment in varying numbers of years in the 9-year period from 1908 
to 1916, inclusive. The results are given in Tables XXXII and 
XXXITI. Only one of these varieties has proved at all promising. 
Brill (C. I. No. 120) was too tall to be satisfactory and too late to 
make good yields and was discarded at the end of six years. Korean 
(C. I. No. 412) also was tall and late and frequently gave only thin 
stands. It was placed in the experiment in 1910, continued for five 
years, and discarded at the end of 1914. Only Barchet (C. I. No. 310) 
has been carried throughout the 9-year period. 
The stands obtained from the Barchet variety have been unusually 
uniform. The 9-year average plant space has been only 8.4 inches. 
The closest spacing was 3 inches in 1914, and the widest spacing 
14.2 inches in 1916. In the dry spring of 1910 and the wet spring of 
1915 the plant spacings were 13.8 and 10.7 inches, respectively, 
much closer than in most of the milos and kafirs. The average stalk 
space has been only 5.5 inches. The closest spacing was 2.7 inches, 
in 1914, when the plant space was only 3 inches. The widest spacing 
was 8.2 inches, in 1909, when the plant space was 8.9 inches and only 
7 per cent of suckers were produced. Tillering has been in direct 
proportion to stand except in the year 1909. The average production 
