FORAGE CROPS IN NORTHERN GREAT PLAINS. 



39 



as satisfactory as any available. They are also grown in corn for 

 hogging off. This is probably about the best way to utilize the crop 

 when all things are considered. Table 22 gives the seed yields that 

 have been obtained at Redfield from the most promising varieties. 



Table 22. — Seed yields of soy beans at Redfield, S. Dak., for the 9-year period 

 from 1914 to 19.22, inclusive. 





Yields per acre (pounds). 



Variety. 



1914 



1915 



1916 



1917 



1918 



1919 



1920 



1921 



1922 



Aver- 

 age. 



Manchu (30593) 



943 

 951 

 640 



902 



551 

 542 

 613 

 495 



860 

 825 

 737 



737 



364 

 271 

 177 

 230 



222 

 210 



323 

 191 



916 

 836 

 795 

 715 



1,293 

 1,333 

 1,160 

 1,267 



517 

 567 

 821 

 5S6 



775 

 711 

 792 

 832 



716 



Saskatoon (02108) 



694 



Mandarin (36653) 



673 



Aksarben (36576) 



662 



Wisconsin Early Black is a well-known variety generally grown 

 in eastern South Dakota, but it does not appear to be so promising 

 as Manchu and Mandarin, which are the most popular varieties. 

 At Redfield in 1922, the only year Wisconsin Early Black was care- 

 fully tested, it yielded appreciably less than Manchu or Mandarin. 

 Yields of the various varieties tested at Redfield have ranged from 

 3 to 20 bushels per acre. The average for all varieties for all years has 

 been upward of 11 bushels to the acre. 



Fig. 16.— A field of soy beans at Redfield, S. Dak. Early-maturing varieties have made it possible 

 to utilize this crop as far north and west as Redfield. 



In 1914, 1915, and 1916 soy beans were tested as a forage crop at 

 Mandan. During this time the yield was only about half that 

 obtained from field peas. In 1916 soy beans produced 1,645 pounds 

 of forage to the acre, while alfalfa produced more than 3 tons. 



Several varieties of soy beans were tested at Moccasin in 1915, 

 but they did not make a satisfactory growth, owing to the compara- 



