THE MIAMI SERIES OF SOILS. 59 
The Miami silt loam and clay loam are closely associated in geo- 
graphic distribution, and are quite similar in their present crop uses. 
Owing partly to the climate both types 'are used chiefly for corn 
growing, with hay and oats occupying large acreages. Winter wheat 
is extensively, grown upon both soils, giving moderate yields. The 
corn acreage is increasing while that in wheat is decreasing on both 
soil types. In general, the fattening of cattle and the raising of 
hogs constitute the chief forms of animal industry on both types, 
although the dairy industry is well developed in the more northern 
regions of t^eir occurrence. Special crops, with the exception of 
tobacco and tomatoes, are not extensively grown. 
The principal types of the series rank high as general* farming 
soils, giving yields of the staple crops which equal or exceed the 
average of the States where they are most extensively developed. 
It is generally true that the heavier members of the series are much 
improved by tile underdrainage, while all of the types require the 
addition of organic matter in the surface soils either by the use of 
stable manure or the plowing under of green manure. It has been 
found that while the subsoils of the different types are generally 
calcareous, the application of lime to the surface soils is beneficial 
in conjunction with the growing of clover and other leguminous 
crops. 
Practically all the available areas of the principal types have 
been cleared and are utilized for agricultural purposes, only the 
rougher land remaining in woodlots or in permanent pastures. 
While crop yields are, in general, satisfactory, it has been found that 
careful attention to crop rotation, the incorporation of organic ma- 
nures, the use of commercial fertilizers with the small grain crops, 
liming, and tile underdrainage on the heavier types aid in increas- 
ing crop yields. 
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