118 HATCH EXPERIMENT STATION. [Jan. 



It will be seen that the muriate of potash has given the 

 larger yield ; but, since the onions on the suU'ate Avere riper 

 than those on the muriate, the figures probably have no 

 special significance. 



IV. — Fertilizers for Garden Crops. (Field C.) 

 The conclusions now presented are based upon the results 

 of experiments wliich have been in progress since 1891. 

 From that date to 1898 chemical fertilizers alone were used. 

 During the past five years stable manure has been applied 

 in equal quantities (at the rate of 30 tons per acre) to each 

 of the plots, while the chemical fertilizers have been used 

 in the same amounts and applied to the same plots as at 

 first. The crops grown during this series of years have 

 included all important out-door crops : spinach, lettuce, 

 onions, garden peas, table beets, early cabbages, late cab- 

 bages, potatoes, tomatoes, squashes, turnips, sweet corn, 

 celery, and one small fruit, — strawberries. Two of the 

 perennial garden crops, asparagus and rhubarb, have now 

 been planted, but these will not be discussed in the present 

 report. Experiments have been planned with reference to 

 throwing light especially upon two points : — 



A. The relative value of nitrate of soda, sulfate of 

 ammonia and dried blood as sources of nitrogen. 



B. The relative value of sulfate of potash and muriate 

 of potash. 



These two points will be separately discussed. 



A. — The Relative Value of Nitrate of Soda, Sulfate of 

 Aimnonia and Dried Blood as Sources of Nitrogen. 



The three fertilizers used as sources of nitrogen have from 

 the first been applied in such amounts as to furnish equal 

 nitrogen to each plot, and each fertilizer is always applied 

 to the same plot. Each of the nitrogen fertilizers is used 

 on two plots, — on one with sulfate of potash, on the other 

 with nmriatc. Dissolved bone-black as a source of phos- 

 phoric acid is applied in equal quantities to all plots. The 

 results previous to this year may be thus summarized : — 



For the early crops, i.e., the crops making most of their 



