20 HATCH EXPERIMENT STATION. [Jan. 



potash and 30,600 pounds on sulfate. The yield on the 

 muriate is somewhat better than on the sulfate, — a result 

 which is at variance Avith results Avhich have been obtained 

 in some previous years. Clearly, climatic conditions have 

 an important influence in determining the manurial effect 

 of these salts, 



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



The experiments upon which the conclusions now pre- 

 sented are based have been in progress since 1891. Up to 

 1898, chemical fertilizers alone were used. During the past 

 four years stable manure has been applied in equal quanti- 

 ties (at rate of 30 tons per acre) to each of the plots, wliile 

 the chemical fertilizers have been used in the same amounts 

 and applied to the same plots as at first. Tlie crops grown 

 during this series of years have included all important out- 

 door garden crops, viz., spinach, lettuce, onions, garden 

 peas, table beets, early cabbages, late cabbages, potatoes, 

 tomatoes, squashes, tiu'nips, sweet corn and celery ; and 

 one small fruit, — strawberries. The experiments have 

 been planned with reference to throwing light especially 

 upon two points : — 



A. — The relative value of nitrate of soda, sulfate of am- 

 monia 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 for Garden Crops of Nitrate of 



Soda, Sulfate of Ammonia and Dried Blood as Sources 



of JViirogen. 



The tliree 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 tw^o plots, — on one wdth sulfate of potasli, on 



the other with muriate. Dissolved bone-black, as a source 



of phosphoric acid, is applied in equal quantities to all 



