40 



BULLETIN 1039, U. S. DEPAETMEFT OF AGKICULTUEE. 



Table XXVII. — Yields of Black Voronezh proso grown in spacing experiment'i 

 on dry land on the Belle Fourche Experiment Farm in 1916- and 1911. 



Distance between rows. 



Yields per acre, bushels. 



1916 



1917 



Average. 



7 inches 



26.1 

 23.5 

 16.0 



24.4 

 20.9 

 16.7 



25 2 





22.2 



21 inches 



16 J 







The average yield from the plats sown in the regular 7-inch drill 

 rows was 25.2 bushels, from the 14-inch rows 22.2 bushels, and from 

 the 21-inch rows 16.3 bushels per acre. Proso has rather coarse stems 

 and spreading branches, and it was thought that the wider spacing 

 might show a slight advantage. The yields, however, were strongly 

 in favor of the thick spacing. Unfortunately, the rates of seeding 

 Avere different with each spacing, but the results obtained in this and 

 the rate-of -seeding experiment previously described seem to indicate 

 that proso should be sown in drill rows about 7 or 8 inches apart at a 

 rate not less than 25 to 30 pounds per acre, 



EXPERIMENT WITH GRAIN SORGHUMS. 



One or more varieties of grain sorghum were sown at Newell each 

 year from 1908 to 1917, except in 1911, when the soil was too dry for 

 the seed to germinate. Most types did not produce seed and did not 

 filways form heads because of the cool weather. The only varieties 

 which matured seed were extremely early, and included Manchu 

 Brown kaoliang, Dwarf milo, and Freed sorgo. The Dwarf milo pro- 

 duced seed only in 1913. The yields of the leading grain-sorghum 

 varieties are shown in Table XX^rCII. 



Table XXYIII. — Yields of the leading varieties and strains of grain sorghum 

 grown on dry land on the Belle Fourche Experiment Farm, 1908 to 1911, 

 inclusive. 





C.I. 



No. 





Yield 



per acre (bushels). 







Group and variety. 



190SC 



1909'J 



1910a 



1912 



19136 



1914 c 



1915c 



1916 c 



1917rf 



Aver- 

 age, 

 1903 

 to 

 1917. 



Kaoliang: 



171 

 261 

 261 

 261 



328 



22.9 



'is-'g' 



13.2 

 12.3 

 9.4 



7.1 

 "i2."2" 



n.6 



8.0 





 

 

 

 



5.0 

 6.2 

 4.6 

 6.2 

 4.2 



5.0 



5.8 



4.6 

 3.5 

 1.5 

 2.5 

 6.6 







6.0 





 

 

 

 













 







Manchu Brown Selection 3-1 . 

 Manchu Brown Selection 3-5. 

 Manchu Brown Selection 4. . . 













 















23.6 



6.5 



Milo: 





Sorgo: 

































a Yield calculated from that of an 80-foot row. 

 b Yield calculated from that of a 132-foot row. 



c Yield calculated from that of two 132-foot rows. 

 d Yield calculated from that of a tenth-acre plat. 



