1896.] PUBLIC DOCUMENT — No. 33. 115 



Amount of Fertilizing Ingredients used Annually per Acre. 



f Nitrogen, . . . .45 pounds 



Plats 0, 1, 2, 3, 5, 6, 8, 10, J. Phosphoric acid, 

 [ Potassium oxide, 



( Nitrogen, 

 Plats 4, 7, 9, . . . < Phosphoric acid, 

 [Potassium oxide, 



80 pounds. 

 125 pounds. 



none. 

 80 pounds. 

 125 pounds. 



The mechanical preparation of the soil, the incorporation 

 of the manurial substances, the seeding, cultivating and har- 

 vesting, were carried on year after year in a like manner, 

 and as far as practicable on the same day in case of every 

 plat during the same year. 



Kind of Crojos raised. 



Corn (maize), in 1889. 



Oats, in 1890. 



Rye, in 1891. 



Soja bean, in 1892. 



The annual yield of the various crops upon the different 

 plats showed that as a rule those plats (4, 7, 9) which had 

 not received in any form nitrogen for manurial purposes 

 yielded much smaller crops than those that annually received 

 in some form or other an addition of a corresponding amount 

 of available nitrogen. . 



The results of four years of careful observation were ex- 

 pressed in the following conclusion : — 



The experiments carried on upon Field A during the years 

 1889, '90, '91 and '92 show conclusive!)/ the importance of 

 a liberal supply to the soil of an available form of nitrogen 

 to secure a successful and remunerative cultivation of faun 

 crops under otherwise corresponding favorable conditions. 

 For even a leguminous crop, the soja bean, ivJien for the first 

 time raised upon Field A, did not furnish an exception to our 

 observation (1892). (For details, see report for 1892.) 



Subsequent to the year 1892, when for the first time in the 

 more recent history of the field under discussion a legumi- 

 nous crop, a late-maturing variety of soja bean, had been 



