52 



9. Potash. 



The potash (Table 50) is fairly uniform for each type on the two 

 drifts, the averages for the three- foot section, with the exception of 

 those for the Carrington loam, being practically the same. On the 

 T-ate Wisconsin the latter type shows slightly higher amounts, averag- 

 ing 1.88 per cent compared with 1.74 on the older drift. However, if 

 the amounts found in the fifteen fields on each drift are averaged the 

 percentage is the same in both cases, viz., 1.79. 



Depth 

 Inchei- 



1— 6 



7—12 



13—24 



25-36 



Average 



1—36 



Table 30. — Potash in the different sections. 



Carrington silt loam 



Kans 

 per cent 



1.76 

 1.84 

 1.90 

 1.87 



1.86 



Late Wis. 

 per cent 



1.66 

 1.74 

 1.86 

 1.87 



1.80 



Fargo silt loam 

 Kansan Late Wis 



Carrington loam 



per cent 



1.57 

 1.64 

 1.83 

 1.86 



1.76 



per cent 



1.60 

 1.68 

 1.71 

 1.75 



1.70 



Kansan 

 per cent 



1.72 

 1.76 

 1.82 

 1.65 



1.74 



Late Wis. 

 per cent 



1.8<^ 

 1.9/ 

 1.06 

 1.76 



l.i 



The percentages found for the surface sections are, in every case, 

 lower than those found for the second, while the amounts in the three 

 lower sections, except those on the Carrington loam, are very similar. 

 On the type just mentioned the third foot-section carries on both drifts 

 a smaller amount than any of those above it. 



10. Soda. 



On the two Carrington series the soda (Table 51) is very uniform 

 for both drifts, showing little variation either between the different 

 sections or from the surface downward. With the Fargo silt loam the 

 amounts are distinctly the higher on the Kansan, averaging 1.48 per 

 cent as compared with 1.23 per cent for the younger drift. The widest 

 range in distnbution from the surface downward is shown by the same 

 fields, where it varies from 1.31 per cent in the surface to 1.59 per cent 

 in the third foot. 



Table ^T. — Soda in the different sections. 



Depth 

 Inches 



1— 6 



7—12 



13—24 



25—36 



Average 



1—36 



Carrington silt loam 

 Kansan Late Wis. 



per cent per cent 



1.26 

 1.36 

 1.37 

 1.20 



1.32 



1.39 

 1.35 

 1.33 

 1.31 



1.33 



Fargo silt loam Carrington loam 



Kansan Late Wis. Kansan Late Wis. 



per cent per cent per cent per cent 



1.31 

 1.48 

 1.45 

 1.59 



1.48 



1.18 

 129 

 1.27 

 1.18 



1.23 



1.46 

 1.42 

 1.38 

 1.41 



1.41 



1.41 

 1.42 

 1.40 

 1.42 



1.41 



