64 CYANAMID — MANUFACTURE, CHEMISTRY AND USES 



The rate of nitrification of Cyanamid is somewhat less than 

 that of sulphate of ammonia when both are applied in large 

 doses. In doses such as would be used in practical agriculture 

 there is probably not much difference. The rate of nitrification 

 must vary greatly in different soils and individual experiments 

 can show but little of general application. As a general 

 average of observations made in Germany, it appears that the 

 duration of Cyanamid nitrogen in the soil is about 70-80 days. 

 In very active soils it is probably less, in cold soils of low 

 bacterial activity it is probably more. Its duration is there- 

 fore about midway between that of ammonium sulphate and 

 dried blood. 



