SOIL INOCULATION 



827 



In some soils the increase was 171.2 per cent greater than that of the 

 untreated control. On adding 2.5 tons of CaC0 3 per acre in addition to 

 inoculation, the increased crop yield was 310.7 per cent more than the 

 control. Inoculation also increased the nitrogen percentage in the 

 roots and vines. 36 In case of soybeans an average increase of 100 



Fig. 77. Influence of inoculation and liming upon the growth and nitrogen 

 content of alfalfa: checked columns denote uninoculated and dark columns 

 inoculated soil (from Fred and Graul). 



pounds of nitrogen per acre from inoculation, in pot experiments, and 

 24 pounds in field experiments is recorded. Inoculation increased the 



36 Graul and Fred, 1922 (p. 825) ; Fred, E. B. The fixation of atmospheric nitro- 

 gen by inoculated soybeans. Soil Sci., 11: 469^177. 1921; Whiting, A. L., 

 Fred, E. B., and Stevens, J. W. Inoculation increases yield and quality of peas 

 for canning. Wis. Agr. Exp. Sta Bui. 372. 1925. 



