68 BULLETIN 698, U. S. DEPARTMENT OF AGRICULTURE. 
average acre yield of 13.9 bushels, while the best selection of the Black- 
hull varieties has made an average acre yield of 17.3 bushels in the 
same period. In two years, 1910 and 1914, the average acre yields of 
all Red kafir selections have exceeded those of all Blackhull selections. 
In two other years they have equaled those of the Blackhull selectionsg 
in three years they have been lower, and in two years both varieties 
have failed completely. When only the yield of the best plat in each 
year is considered, the Red kafir has outranked the Blackhull four 
times, has been outranked by Blackhull three times, and twice both 
have failed to produce any grain. The same selection has not been 
the high-yielding plat in either variety more than two or three times. 
The annual and average acre yields from each selection, during such 
part of the 9-year period as they were under experiment, are shown 
in Table X XV, while the same data from all the Blackhull varieties 
are Shown in Table XX. The highest yield produced by the two 
varieties was in 1915, when Blackhull yielded 64 bushels and Red 
kafir 57 bushels per acre. The yields of the leading races of all kafir 
varieties are compared in Table XXX. 
TABLE XXV.—Annual and average yields of Red kafir grown at the Amarillo Cereal Field 
“Station in periods of varying length during the nine years from 1908 to 1916, inclusive. 
{In the statement of yields per acre the bushel is rated at 60 pounds.] 
| Annual yields (bushels). Average yields. 
[ | | | 
= 4 6 7 
C. I. No. years, Sie SES 9 years, 
1908 | 1909 | 1910 | 1911 | 1912 | 1913 | 1914 | 1915 | 1916 | 1910 | 1908 | 1910 1908 to 
to to to 191 
1913. | 1913. | 1916. 
| 
Bus. | Bus. | Bus.| Bus. | Cut. 
EAE ES eee ja36.4 |b 4.0 SPA | EROS Th 3.0 0 13.3 | 44.3 0 62.074) AD 2 A229 8.3 
GS estes A 37.0 | 10.7 ASD atone 3.8 Olena Se ee ae Renee 65.05) S105. OS. < eeee melee 
692. eee ee PPGT Ih we) PAE AG | 3.8 Osa | Shee | Se EA ae ee 5: 92) Suess. cee Slee 
22a ees ae ee | 28. 7 4.6 4.4 | 19.0 2a, Qiks | 226 Sees eee 6.4 9) 3422 ose ole 
Depress eae ae, | 32.0] 5.0.) 2.9 15: Gul Serle | ap igs |=) eee eee 5.4.) 9. 8a: seal eee 
DOO a FAA SEERA Ae | 7.5 | 24.3 | 11.2 0 15. 8 | 57.0 0 LOSS sleeeere 952" | es Se Sesees 
DOGS ee eet | Sepia (tea } 10.7 | 20.0 | 5.8 Ola ele lee Qs Waihi so eta es eae er 
BA ee Ses RAP Se AS ie a Halt Qe occ SR a Se Se | ae Se ee erred ees 
| | | | | | 
a Average yield from 2 plats. b Average yield from 4 plats. 
NEW KAFIRS. 
Of the varieties and selections grouped under this title, all except 
one are introductions from South Africa. A list of them will be 
found in Table X XVI, showing the accession number of the Office 
of Foreign Seed and Plant Introduction, the date of introduction, the 
source, and native name, if any. -All of them belong to the kafir 
group, though none of them would be considered identical with vari- 
eties now grown in this country. The results obtained in the ex- 
periments are shown in Table XXVII. The plat experiments were 
begun in 1908 with 9 varieties. The number was increased to 12 
in 1910 and 1911 and to 14 during each of the next two years. In 
each of the last three years only 7 varieties have been grown. 
