108 Bihite Acids and Phosphorus Compounds in the Soil 



After 24 hours' treatment with N/10 HNO3 



PgOj added, mgras 



P2O5 found in solution (C), m<i,ms. 

 P2O5 left in soil (y), mgms 



Equation obtained: 2/ = ll-5C3-l . 



Table X. Effect of alteration of comjposition of extraction liquid on 

 the adsorptioti equilibrium in soils. Hoos 2C. 



I. 50-2 gms. of soil treated with 1000 c.c. of an extract obtained 

 by treating soil with N/10 HNO3 for 24 hours and filtering of?. 4 c.c. 

 of phosphate solution was also added. Time = 0. 



In extract after 24 hours there were 22-08 mgms. P2O5 per litre. 

 In soil there were 110 mgms. per 100 gms. 

 Acidity of original acid = 0-0956 equivs. HNO3 per litre. 

 24 hours' extract = 0-0760 

 final extract = 0-0660 



P0O5 added 



Po'Oj in solution (1000 'i.e.) (C) 

 P;O5insoil(100gms.)(2/) 



44G 



67- 1 



108-6 



Equation is 2/=44-l C4-9 . 



II. Fresh acid. 50 gms. of soil to 1000 c.c. of 0-076 N HNO3, 

 Time = 0. In soil 110 mgms. PgOg per 100 gms. 



PjOg added 



P2O5 in solution (lOOOc.c.) (C) 

 PoOg in soil (100 urns.) (y) 



27-3 



45-G 

 73-4 



Equation is y=34-5C5-i . 



III. Fresh acid. 50 gms. soil to 1000 c.c. N/10 HNO3. In soil 

 110 mgms. P2O5 per 100 gms. 



P^Ob added 



P^Og in solution (1000 c.c.) (C) ... 

 P^Og in soil (100 gms.) (2/) 



70-0 

 81-G 



Equation is y = 50-7 C'S'6 . 



