136 CHEMISTRY OF FARM PRACTICE 



1910 gives a proximate analysis of this material, which 

 shows 3.39 per cent nitrogen in the form of nitrate, and 

 13.62 per cent of nitrogen in the cyanamide form. 



Experiments show that cyanamides do not give as good 

 results as a fertilizer as does sulphate of ammonia, on 

 soils containing an abundant supply of calcium carbonate. 

 On acid soils, the lime content of the cyanftmide should 

 exert a good influence. 



