Feb. 25. 1918 Influence of Carbonates on Soil Bacteria 



481 



i 2 5 4 5 



t U/eeA 



/ i 3 4 5 



12 5 4 5 



3 Wee As 



i Z i 4 5 

 6 U/eeA& 



Fig. 7.— Diagram showing the influence of the carbonates and chlorids of magnesium and calcium on the 

 number of bacteria in Colby silt loam soil. 



i=no treatment. 



2= O.I per cent magnesium chlorid. 



3=0.1 per cent calcium chlorid. 



4=full calcium carbonate. 

 S=full magnesium carbonate. 



