8 



LEGUME INOCULATION AND THE LITMUS KEACTION OF SOILS. 



Table II. — Relation between the litmus reaction of soil ayid the inoculation of alfalfa with 

 pure cultures of nodule bacteria — Continued. 



LITMUS REACTION RED; LIMED. 



LITMUS REACTION RED; MANURED. 



Waterloo, Ind , 



Edwards, Miss 



Columbia City, Ind. 

 Pleasant Lake, Ind . 



Lagrange, Ind 



Albion, Ind 



Bordentown, N. J.. 



Miami 



Loess 



Miami 



do 



Marshall or alluvial. 



Miami 



Sassafras loam 



+ 



+ 

 + 

 -I- 

 + 



The inoculation of vetch, while apparently bearing some relation 

 to the litmus reaction, is by no means so sharply limited. ' Consultino; 

 Table III, it is evident that successful inoculation is to be expected 

 upon the soils which leave the litmus strips unchanged or those which 

 blue litmus rather than upon those which redden litmus. Expressed 

 in percentages, the successful inoculations which were obtained are 

 as follows: 



Red litmus soils allow 65 per cent. 



Faint-pink litmus soils allow 75 per cent. 



Unchanged litmus soils allow 66 per cent. 



Blue litmus soils allow 85 per cent. 



Table III. — Relation between the litmus reaction of soil and the inoculation of retch 



with pure cultures of nodule bacteria. 



LITMUS REACTION RED. 



[Cir. 71] 



