1907.] 



PUBLIC DOCUMENT— No. 33. 



39 



cial corn fertilizers analyzed at this station. This average 

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

 date we have made no change in the kinds and amounts of 

 fertilizers used, it was as follows : — 



Nitrogen, 

 Phosphoric! acid, 

 Potash, . 



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 jjotash, 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 : — 



The fertilizer materials applied to the several plots annu- 

 ally are shown below : — 



