1897.] PUBLIC DOC^UMENT — No. 33. 201 



3. Sulphnte of ammonia as a nitrogen source, in connec- 

 tion with muriate of potash as source of potash (Plat 1), has 

 given as a rule the least satisfactory returns. This fact is 

 evidently due to a change of chloride of potash and sulphate 

 of ammonia into sulphate of potash and chloride of ammo- 

 nium, the latter being an unfavorable form of nitrogen plant 

 food. 



4. The influence of the difference in the general character 

 of the weather, wdiether normal or dry, during succeeding 

 seasons on the yield of the crops has been greater than that 

 of the different fertilizers used upon different plats durino- 

 the same season. 



Note. — The general management of the field work con- 

 nected with the previously described continuation of my 

 experiments was attended to by Mr. H. M. Thomson, Assist- 

 ant iVgriculturist of the Hatch Experiuient Station, to whom 

 I take pleasure in expressing my thanks for his cheerful 

 assistance. 



