228 



PHOSPHATE FERTILIZERS 



Now to illustrate their combination graphically 



H— O 

 \ 



H— O— P=0 



/ 



o 



Monocalcium phosphate 



Dicalcium phosphate 



Tricalcium phosphate 



Tetracalcium phosphate 



Ca 



O 



\ 



H— O— P=0 



/ 

 H— O 



H— O 



\ 

 H— O— P=0 



/ 

 O 



Ca/ 



O 



\ 

 /O— P=0 



/ 



o 



•0 



\ 



•0— P=0 



/ 



o 



\ 



,0— P=0 



/ 



o o 



/ \ / \ 



Ca P Ca 



Ca 



Ca 



Ca 



Ca 



O 



O 



O 



O 



o 



Ca P Ca 

 \ / \ / 



o o 



