50 



Kansan being 0.214 per cent compared with 0.156 per cent for the Late 

 Wisconiiin. The former shows the higher content in all four levels. It 

 is to be iioted that the decrease in the amounts found in the third foot- 

 section en the Kansan is not nearly so great as on the younger drift. 



TabU 46. — Phosphoric acid in the different sections from the five fields on 

 Fargo silt loam. 



Carrmgton Loam. In the soils on this type (Table 47) neither the 

 distribution from the surface downward nor that from field to field is 

 as regular as was the case on the two prairie types. The averages for 

 the five fields on the two drifts show a general decrease from the sur- 

 face downward, although on the Late Wisconsin they are, below the 

 first 6-inch section, practically the same. The general average for the 

 Kansan is slightly the higher, being 0.177 per cent as compared with 

 d.l.Sl per cent for the Late Wisconsin. 



