1895.] PUBLIC DOCUMENT — No. 33. 193 



Kind of Crops raised. 



Com (maize), . . . . ' in 1889. 



Oats, in 1S90. 



Rye, in 1891. 



Soja bean, in 1892 



Oats, in 1893. 



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 received annually in some 

 form or other an addition of a corresponding amount of 

 available nitrogen . 



The results of our observations were stated as follows : — 



TJte experiments carried on upon Field A during the years 

 1889, ^90, ^91 and '92 shoio conclusively the importance of 

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

 secure a successful and remunerative cultivation of farm crops 

 under othenvise corresponding favorable conditions. For 

 even a leguminous crop, the soja bean, when for the first time 

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

 observation ( 1 892) . 



1893. — The main object of our experiment upon Field A 

 during that season was to oliserve the after-effect of the cul- 

 tivation of soj'a bean (a leguminous crop) on the nitrogen 

 resources of the soil which served for its production. It 

 seemed of interest in our case to ascertain whether the rais- 

 ing of the soja bean upon Field A had increased the amount 

 of available nitrogen stored up in the soil to such an extent 

 as to affect the 3'ield of the succeeding crop upon those plats 

 (4, 7, 9) which as a rule did not receive at any time an 

 addition of available nitrogen from any other manurial source 

 but the atmospheric air and the roots of the soja beans left 

 in the soil after harvesting the crop. 



A grain crop (oats) was selected as the crop suitable to 

 serve for that purpose. The general management of the 

 experiment, as far as the preparation of the soil, manurin<>- 

 and seeding-down are concerned, was the same as in preced- 

 ing years (see tenth annual report). 



