Massachusetts Agricultural ColleU6i 

 AMHERST, MASS. 



massachusetts 

 Agricultural Experiment Station 



BULLETIN No. 204 SEPTEMBER, 1921 



THIRTY YEARS' EXPERIENCE 



WITH 



SULFATE OF AMMONIA 



By F. W. MORSE 



Sulfate of ammonia is now the most important domestic source of 

 fertilizer nitrogen. During the late war its production in this country, 

 by means of by-product coke ovens, was increased to three times its 

 previous volume. It is apparently one of the most promising sources 

 of nitrogen to which we must look in the future. It is necessary that 

 we should know the conditions under which it is used most effectively. 

 Experiments in the use of this product have been under way for 

 many years at the Massachusetts Agricultural Experiment Station. 

 Sometimes the effects have been excellent; at other times positive 

 injury to crops has apparently been caused by its use. This bulletin 

 reports a study of the various conditions under which these results were 

 secured. 



Requests for Bulletins should be addressed to the 



AGRICULTURAL EXPERIMENT STATION 



AMHERST, MASS. 



