^ T. Lyttleton Lyon and James A. Bizzell 



TABLE 34. Removal of Nitrogen from Planted and Unplanted Soil Tanks 

 (May 23, 1910, to May 1, 1911) 





Tanks 



Crop 



Nitrogen (pounds per acre) in 





Drainage 



Tops 



Roots* 

 (estimated) 



Tops, 



roots, 



and 



drainage 



2, 4, 8. 



)'.'.'.'.'.'.'.'.'.'.'.'.'.'.. 



None 



120 

 11 

 12 



140 



90 ~ 



47 



30 



120 



3, 5, 7, ( 



Maize 



198 



6, 10... 



Oats 



132 







(May 1, 1911, 



to May 1, 1912) 









Tanks 



Crop 



Nitrogen (pounds per acre) in 





Drainage 



Tops 



Roots* 

 (estimated) 



Tops, 



roots, 



and 



drainage 



4,8 



None 



Oats 



Grass 



68 

 5 

 1 



52 



30 



17 



10 



68 



3, 5, 7, 

 6, 10.. 



9 



74 

 41 







* Nitrogen in roots estimated as one third that in tops. 



If plants have a stimulating influence on nitrate formation during the 

 earlier growing stages and a depressing influence later, the nitrogen in the 

 drainage water plus the nitrogen in the crop will be greater or less than 

 the nitrogen in the drainage water from the unplanted soil, in proportion 

 to the relative activities of the two influences and also to the extent to 

 which the plant in question absorbs nitrogen in forms other than as nitrates. 



In Deherain's experiments maize gave about as much nitrogen in the 

 crop and the drainage water as was contained in the drainage water of the 



