THE DRY FARMING CONGRESS. 



145 



The upper half of this diagram shows by curves and figures the average 

 yields in bushels, of Oats raised under different systems of rotation and soil 

 preparation at Dickinson, N. D., in 1908; Edgeley, N. D., in 1907 and 1908; 

 Highmore, S. D., in 1906, 1907 and 1908; North Platte, Nebraska, in 1907 and 

 1908; Hayes, Kansas, in 1908; Amarillo, Texas, in 1908; each curve, representing 

 the station designated by name on the curve, as follows: 



