291 



Soil. 



Fine 

 Gravel. 



Coarse 

 Sand. 



Medium 

 Sand. 



Fine 



Sand. 



Very 

 Fine 

 Sand. 



Silt. 



Clay. 



Marshall Silt Loam 



0.2 

 0.4 



1.1 

 1.8 



1.3 

 1.0 



3.9 



2.2 



5.7 

 7.3 



67.2 

 68.4 



20.0 

 18.9 















On the "second bottoms" the soils contain a much greater percentage 

 of sand and are correspondingly poor in silt and clay. The quantity of 

 organic matter is variable depending upon location and drainage condi- 

 tions. Typical examples of "second bottom" soils are the Sioux sandy 

 loam and Miami sand the composition of which, as given by the Bureau 

 of Soils, is shown in the following table : 



Soil. 



Fine 

 Gravel. 



Coarse 

 Sand. 



i 



Medium : Fine 

 Sand. Sand. 



Very 

 Fine 

 Sand. 



Silt. 



Clay. 



Sioux Sandy Loam 



2.2 

 .0 



9.8 

 3.0 



10.2 28.5 



13.3 52.0 



1 



10.3 

 11.5 



27.1 

 13. 8n 



11.2 

 6.4 







The characteristic soil of the river bottoms is the Wabash silt loam. 

 This is the material deposited during periods of high water. It resembles 

 the upland soils in its high silt-clay content, but differs in having a con- 

 siderable percentage of sand. The mechanical composition of this soil as 

 given by the Bureau of Soils is as follows : 



Soil. 



Fine 

 Gravel. 



Coarse 

 Sand. 



Medium 

 Sand. 



Fine 

 Sand. 



Very 

 Fine 

 Sand. 



Silt. 



Clay. 



Wabash Silt Loam 



0.0 



Trace. 



0.3 



27.0 



2.1 



66.1 



28.4 



These, as well as the other soils of the region not herein specifically 

 mentioned, are all characterized by their prevailing fine texture, a rule 

 that holds even in the case of the sandy soils in which the major con- 

 stituent is the fine sand, so that, in spite of the rapid drainage afforded 



