82 



T. Lyttleton Lyon and James A. Bizzell 



TABLE 31. Nitrates in Soil under Aualfa and under Timothy, and in Soil that 

 Had Previously Grown these Crops but that Was Kept Free from Vegetation. 

 Samples Taken July 6, 1910 



Plat 



Depth 

 (feet) 



Crop on soil when sampled 



Crop 



Bare soil 



I Nitrates 

 Soil ! (parts 



treatment , per 



million) 



Nitrates 

 Previous ' (parts 

 crop I per 



million) 



400ra... 

 4001 a . . . 

 4001 a . . . 

 4001 a . . . 



1 

 2 

 3 



4 



Alfalfa 



Alfalfa 



Alfalfa 



Alfalfa 



Limed 



Limed 



Limed 



Limed 



14 



1 

 1 

 1 



AlfaLfa 



Alfalfa 



AlfaKa 



.\lfalfa 



46 

 7 

 5 

 3 



Total.. . 



17 



61 













4002 a . . . 

 4002 a .. . 

 4002 a . . . 

 4002 a . . . 



1 

 2 

 3 



4 



Timothy 



Tunothv 



Timothv 



Timothy 



Limed 



Limed 



Limed 



Limed 



6 



1 

 1 



i 



Timothy 



Timothv 



Timothy 



Timothy 



30 



3 



3 



Trace 



Total 



9 



3G 













4001 c . . . 

 4001 c . . . 

 4001 c. . . 

 4001 c . . . 



1 

 2 

 3 

 4 



Alfalfa 



AlfaKa 



Alfalfa 



AlfaKa 



Not limed .... 

 Not iimed .... 

 Not limed .... 

 Not limed .... 



28 

 3 

 2 



Trace 



Alfalfa 



Alfalfa 



.llfalfa 



AlfaKa 



39 



14 



3 



1 



Total . 



33 



57 













4002 c . . . 

 4002 c . . . 

 4002 c . . . 

 4002 c . . . 



1 

 2 

 3 



4 



Timothy 



Timothy 



Timothy 



Timothy 



Not limed .... 

 Not limed .... 

 Not Urned .... 

 Not limed .... 



3 

 Trace 

 Trace 

 Trace 



Timothy 



Timotlw 



Timothy 



Timothy 



~ 12 



3 



Trace 



Trace 



Total 



3 



13 













through differences m the soil in this respect. The nitrate content of the 

 soil as it came from the field was then subtracted from the nitrate content 

 after incubation without dried blood, in order to ascertain the nitrifjdng 

 activity of the soil. The nitrates formed in the soil treated with dried 

 blood less the nitrates in the field soil possibly represent the efficiency' of 

 the nitrate-forming bacteria more nearly than do the nitrates produced 

 either by direct incubation or by incubation with dried blood. In Table 



