68 



BULLETIN 698, U. S. DEPARTMENT OF AGRICULTUEE. 



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 selections, 

 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 XXV, 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. 



C. I. No. 



1908 



1909 



1910 



1911 



1912 



1913 



1914 



1915 



1916 



4 



years, 



1910 



to 

 1913. 



6 



years, 



1908 



to 



1913. 



7 

 years, 

 1910 



to 

 1916. 



9 years, 



1908 to 



1916. 



34 



a36.4 

 37.0 

 27.7 

 28.7 

 32.0 



b 4.0 

 10.7 

 3.0 

 4.6 

 5.0 



5.2 

 4.2 

 2.4 

 4.4 

 2.9 

 7.5 

 10.7 



18.7 

 15.8 

 17.5 

 19.0 

 15.6 

 24.3 

 20.0 



3.0 

 3.8 

 3.8 

 2.2 

 3.1 

 11.2 

 5.8 

 1.1 





 

 

 

 

 

 

 



13.3 



44.3 







6.7 

 6.0 

 5.9 

 6.4 

 • 5.4 

 10.8 

 9.1 



Bus. 

 11.2 

 11.9 

 9.1 



9.8 

 9.8 



Bus. 

 12.1 



Bus. 

 13.9 



Cwt. 

 8.3 



68 





69 















212 















215 















356 



15.8 



57.0 







9.2 







366 











445 















































a Average yield from 2 plats. 



t> Average yield from 4 plats. 



NEW KAFIRS. 



Of the varieties and selections grouped under this title, aU except 

 one are introductions from South Africa. A list of them wiU be 

 found in Table XXVI, showing the accession number of the Office 

 of Foreign Seed and Plant Introduction, the date of introduction, the 

 source, and native name, if any. AU 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. 



