ROTATIONS AND SOIL FERTILITY 299 



Rosen states that rotation is very commonly prac- 

 ticed in the dry sections of southern Russia, usually 

 including an occasional summer fallow. As a type 

 of an eight-year rotation practiced at the Poltava 



Fig. 71. Dry-farm corn. Rosebud Co., Montana, 1909. Cut for for- 

 age. Yield, 9.4 tons well-cured fodder. 



Station, the following is given: (1) Summer tilled 

 and manured; (2) winter wheat: (3) hoed crop; 

 (4) spring wheat ; (5) summer fallow ; (6) winter 

 rye ; (7) buckwheat or an annual legume ; (8) oats. 

 This rotation, it may be observed, includes the grain 

 crop, hoed crop, legume, and fallow every four years. 

 As has been stated elsewhere, any rotation in diy- 

 farming which does not include the summer fallow 



