272 SOILS AND MANURES 



change may be represented by the following equa- 

 tion : 



CaCN 2 + 4H 2 + C0 2 = CaC0 3 + (NH 4 ) 2 C0 8 



Calcium Water. Carbon Calcium Ammonium 

 cyanamide. dioxide, carbonate. carbonate. 



Calcium-cyanamide is the principal compound in the 

 new nitrogenous manure sold under the popular name of 



FIG. 33. View of the Tysselfaldene Power House. 1 



" Nitrolim." This manure has now been m use experiment- 

 ally for about five years, and its practical utility is no 

 longer open to question. Eleven different companies, with 

 a total working capacity of about 150,000 tons a year, 

 have been formed to exploit it in various parts of the world. 

 The North Western Cyanamide Company, by arrangement 



1 Copy supplied by The North Western Cyanamide Co. 



