2IO 



THE CiLKEALS IN AMERICA 



of the North Central States, maize has been raised continuously 

 for many years with success when more or less frequent applica- 

 tions of stable manure have been made. The Illinois Station 

 raised maize continuously for twenty years upon a black friable 

 prairie soil. The average annual yield from the plat receiving 

 no fertilizers was, during the last eight years of this period (1888- 

 1895), 35.7 bushels ; from the plat receiving commercial fertilizer, 

 35.6 bushels, and from the plat receiving stable manure, 47.3 

 bushels. A six-course rotation, maize, two years ; oats, one year ; 



In referring to the different sections of the United States the nonnenclature of the United 

 States Census Bureau is followed, as shown above. Northern States include North 

 Atlantic and North Central States, and Southern States include South Atlantic and 

 South Central States. 



and clover, three years, was carried out during twenty years 

 as uniformly as the exigencies of the clover catch would permit. 

 During the last eight years five comparisons as to increase of 

 yield, both first year and second year after clover, could be made 

 with the plat continuously in maize and receiving no fertilizer. 

 The average increase the first year was twenty bushels and the 

 second year 15.2 bushels per acre. In a similar comparison, 

 where maize alternated with oats, the average increased yield as 



