126 HATCH EXPERIMENT STATION. [Jan. 



The relative influence of the nitrogen fertilizers has differed 

 widely for the difierent crops, as is evident on examination 

 of the above tables, and each must therefore be separately 

 discussed. 



Dandelions. — This crop was started in the summer of 

 1902. The fertilizers this year were applied evenlj^ on April 

 14. The leaves, as above stated, were badly burned where- 

 ever nitrate of soda or sulfate of ammonia was used. The 

 crop was cut May 6, at which time it was judged that the 

 leaves had reached their maximum development. The plants 

 were in blossom, and of course somewhat beyond the stage 

 at which the crop is commonly cut for market. On the 

 basis of the yields obtained, the relative standing of the 

 different nitrogen fertilizers was as follows : — 



Per Cent. 

 Dried blood, 100.00 



Sulfate of ammonia, ...... 78.36 



Nitrate of soda, 72.66 



There can be no doubt that, as a result of the burning 

 effect alluded to, both the sulfate of ammonia and nitrate of 

 soda actually decreased the yield. 



Sti^aicherries. — The vines from which the fruit harvested 

 this year was picked were set in the spring of 1902. The 

 fertilizers used were evenly spread broadcast on April 14. 

 Within a few days the leaves began to show marked injury 

 on the nitrate of soda and sulfate of ammonia plots. On 

 the basis of total weights of ripe fruit, the nitrogen fertili- 

 zers ranked in the following- order : — 



Per Cent. 

 Dried blood, 100.00 



Nitrate of soda, .54.50 



Sulfate of ammonia, . . . . . .49.74 



Without doubt both the nitrate of soda and the sulfate of 

 ammonia proved actually injurious. 



Garden Peas. — The fertilizers applied to this crop were 

 spread broadcast after plowing on April 30, and harrowed 

 in. On the basis of weights of pods and vines harvested, 

 the nitrogen fertilizers take the following relative i-ank : — 



