80 Dilute Acids and Fliospliorus Compounds in the Soil 



Hoos 2C Soil. 



120 



no- 



100 



90 

 80 

 70 

 60 



50 



40 



30 



20 



10 



10 20 



30 



40 r 50 



60 



70 80 90 100 



P2O5 mgm. per 1000 c.c. of solution 



Fig. 7. Adsorption of PjOs in presence of (a) N/10 HNO3 which has already been in 

 contact with soil for 24 hours, (6) fresh HNO3 of equivalent concentration. Two 

 experiments were made, one with N/10 acid (equivalent initial concentration), the 

 other with 0-076 N HNO3 (equivalent final concentration). 



