[SHUTT & CHARLTON] CYANAMIDE COMPOUND AS A FERTILIZER 



77 



duration. This would seem to indicate that the organisms instrumental 

 in the production of nitrates and nitriteis are susceptible to the toxic 

 action of the compoimd. 



Experiment II. — Was conducted upon a portion of the soils used 

 in Experiment I, to which a further application of cyanamide was made, 

 the amount being equivalent to 683 lbs. per acre of a compound con- 

 taining 1G<^ nitrogen. The method of procedure was similar to that 

 just described. The experiment was begun on 21st March, 1905, and 

 subsequent determinations of the nitrogen compounds were made on 

 28th March, 25th April, and 10th May. 



Experiment III. — In this series the potassium salt was used, the 

 amount being equivalent to an application of 361 lbs. per acre of a 

 compound containing 16% nitrogen. The soil used, as in Experiment 

 II, constituted a portion of that employed in Experiment I. The ex- 

 periment was started 21st March, 1905, and subsequent determinations 

 of the nitrogen compounds were made on 28th March, 25th April, and 

 10th May. 



