1895.] PUBLIC DOCUMENT — No. 33. 1D3 



Kind of Crops raised. 



Com (maize), in 1889. 



Oats, inl«90. 



Rye, in 1891. 



Sqjabean, in 1892 



Oats, in 1893. 



The annual yield of the various crops upon the different 

 plats showed that as anile 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 nitrosren. 



The results of our observations were stated as follows : — 



The experimeiita carried on upon Field A. duinng the years 

 1889^ ^90, *91 and *92 show condusivelr/ the importance of 

 a liberal siip)phj to the soil of an available form of nitrogen, to 

 secure a successful and remunerative cuUivalion of farm crops 

 under otherivise 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 observe the after-effect of the cul- 

 tivation of soja bean (a legimiinous crop) on the nitrogen 

 resources of the soil wliich 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 yield 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 tlie soil, manurin<>- 

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

 ing years (see tenth annual report). 



