42 



T. Lyttletox Lyox axd James A. Bizzell 



on May 21. The oats were harvested on August 7 and the maize and 

 potatoes on October 20. 



A statement of the average nitrate content of the surface foot of soil 

 on the cropped and the uncropped sections of the four plats planted to 

 each crop is given in Table 14. For the cropped sections the averages 

 include both the cropped ends of the plats. Moisture contents for the 

 same plats and dates are given also. 



TABLE 14. Average Nitrate Content and Average Moisture in the Surface Foot 

 OF Soil on the Four Plats Planted to Each Crop, on Dates Analyzed 



Nitrate content (parts per million) 





Crop 



May 12 



June 1 



July 28 



August 17 



'&"■ October 17 



Plat 





1 

 a 



c3 



"a 



S3 

 C3 



o 



S 

 S 



"3. 

 c 



U5 



a 



s 



a 



3 



a 



s 



1 

 a 



"a 



a 



■a 

 -g 



i 

 s 



■a 



a 



t3 



1 

 a 



-a 



"ft 



a 



t3 



3612,3613 1 

 3622, 3623 j 



3614, 3615 \ 

 3624, 3625 / 



3616,3617/ 



Maize 



Potatoes 



Oats . . 



66 

 95 

 97 



57 

 34 

 49 



98 

 122 

 125 



62 



58 

 88 



168 



127 



75 



92 

 145 



84 



179 



139 



82 



167 

 135 

 154 



247 

 99 

 67 



273 

 130 

 170 



244 

 43 

 97 



167 

 145 

 211 



3626, 3627 ( 













Moisture (percentage of dry soil) 





Crop 



May 12 



June 1 



July 28 



August 17 



Septem- 

 ber 9 



October 17 



Plat 









J 



T3 



■c 



-e 



■o 



■a 





"S 



-3 







is 



_S 





a 





a 



S 



a 



n 



S 





cS 













o. 





a, 





a 





a 





O. 







5 





i 





S 



P 



S 



a 

 P - 



s 



C3 



S 



c 



3612,3613 1 

 3622, 3623 / 



Maize 



20.9 



20.0 



25.6 



24.5 



16.0 



16.7 



22.1 



23.0 



22.1 



23.0 



16.5 



17.4 



3614, 3615 \ 

 3624, 3625 J 



Potatoes 



21.1 



20.7 



25.7 



24.2 



14.5 



16.1 



20.3 



19.6 



20.3 



19.5 



19.0 



17.2 



3616, 3617 1 



Oats 



22.9 



21.6 



25.7 



25.2 



9.2 



14.9 



18.0 



18.2 



18.0 



18.2 



16.2 



16.5 



3626, 3627 j 







An examination of this table shows, so far as the maize crop is con- 

 cerned, the eharacteristicallj^ higher nitrate content in the planted than 



