Feb. II, i9i8 Efject of Season and Crop Growth on Soil Extract 355 



§5 ^X *S *S ^jj 5Cnj :to ■*to irt&j 



S5 ^^ „^ 10^ <b^ 5^ 5,^ 5S || 



SO/A MS. 

 C/?0/=> A/OA/E. 



/sue 





Fig. 20.— 



g 12 g sj 1^ 15 i^ r 

 ^ ^ ?| 1^ ^^ ^ 5^ ^^ 



Graphs of the seasonal studies of the water extract of soil 14. Standish fine 



sandy loam. 



