1907.] 



PUBLIC DOCUMENT — No. 33. 



39 



cial corn fertilizers analyzed at this station. Tliis average 

 changes but little from year to year, and in 1899, since which 

 date "\ve have made no change in the kinds and amounts of 

 fertilizers used, it was as follows : — 



Nitrogen, 

 riiosplioric acid, 

 rotash, . 



Per Cent. 



2.87 



10.00 



4.30 



The averages for the past year have been: nitrogen, 2.61 

 per cent. ; phosphoric acid, 11.55 per cent. ; and potash, 4 

 per cent. 



The fertilizers which have been used on plots 2 and 4 are 

 substantially the same in amount and kind as were recom- 

 mended for corn in Bulletin No. 58 (Hatch). The essen- 

 tial difference in the fertilizer mixtures under comparison 

 is that the mixture used on plots 2 and 4 is richer in potash 

 and much poorer in phosphoric acid than the mixture rep- 

 resenting the average market corn fertilizers. The difference 

 in the application of the fertilizer elements is shown in the 

 following table : — 



Fertilizer Elements ap2:)lied annually. 



Rates pee Acre (Pounds). 



P2O5 



Plots 1 and 3, 

 Plots 2 and 4, 



42.6 

 47.0 



ISO 

 50 



The fertilizer materials applied to the several plots annu- 

 ally are shown below : — 



Fertilizers used. 



Nitrate of soda, 

 Dried blood, 

 Dry ground flsh, 

 Acid pliosphate, 

 Muriate of potash. 



