94 



T. Littleton Lyon and James A. Bizzell 





APRIL 



MAY ■ 



dUNE 





JULY 



^ 8L 











< 



"^ 20 





/<r^ 



^"-~^X^ 



fi/^lZESO/L 



BARE SOIL 





<^'^ 



"^ 











TOTAL NITROGEN 

 _ IN MAIZE CROP 

 I OF laiO 



30 



/s 













.'^^^^^^^ 



r^^=^ 



/^/ilZE SOIL 

 BARE 50IL 







s 





§^ 70 





^-■^ 



~~"\, 







^^ 30 

 ^ 20 







\ 



\ 





POTATO 50IL 

 BARE SOIL 





^^^.^^^^ 







TOTAL NITROGEN 

 lA/ POTATO CROP 











OF I9IO 



30 











g^S 20 

 ^ /6 









^"^^<:^~- 



POTATn snii 

 aAR£ SO/L 



=^" 







X 









'^ 





^ a^ 











^ .0 



IV 30 

 5 ^0 





.^ 



^\ 



OAT SOIL 

 BARC SOIL 







\ 



\ 





'TOTAL N/TROGEN 

 /N OAT CROP 

 OP /9/0 





^S-^'^ 



^"^^.^ \ 





30 











26 



=— — . 







•^^ 



""^^ 



OAT 60IL 

 BARE 601 L 







\ 













