36 



T. Lyttleton Lyon and James A. Bizzell 



TABLE 16. Yields of Crops in 1910 on Tanks and on Similarly Treated but 



Undrained Field Plats 



REMOVAL OF NITROGEN FROM THE SOIL IN DRAINAGE WATER AND 



IN CROPS 



It is shown by table 8 of the appendix (pages 105-106) that usually, tho 

 not always, a larger quantity of nitrates is removed in the drainage water 

 collected between October 1 and April 30 than in that collected during the 

 summer period. It appears to be the large flow of drainage water during 

 the winter and early spring that causes the greater removal of nitrates 

 at that time. 



TABLE 17. Nitrogen in Drainage Water, Calculated to Pounds per Acre by 



Yearly Periods (May 1 to April 30) 



36 



