482 



Journal of Agricultural Research 



Vol. XII, No. 8 



12 3^667 



12 5^367 



I 2 3 t 5 6 7 



I 2 5 -i 5 6 7 

 eOTee/ci 



FiQ. 8.— Diagram showing the influence of dibasic magnesitun phosphate, monocalcium phosphate, calcium 

 carbonate, and magnesium carbonate on the number of bacteria in Colby silt loam. 



1= no treatment. 



a=o.i per cent dibasic magnesium phosphate. 



3=0.1 per cent monocalcium phosphate. 



4=0.1 per cent dibasic magnesium phosphate+ 



full calcium carbonate. 

 S=o.i per cent monocalcium phosphate+fuU 



calcium carbonate. 



6=o.i per cent dibasic magnesium phosphate+fuU 

 magnesium carbonate . 



7=o.i per cent monocalcium phosphate+full mag- 

 nesium carbonate. 



