THE MIAMI SERIES OF SOILS. 47 
The Miami clay loam is principally devoted to the production of 
corn, wheat, oats, and hay. Of the grain crops the acreage of corn 
takes first rank, the crop being extensively grown upon this type in 
Indiana, Michigan, Ohio, and Wisconsin. In general, the dent varie- 
ties of corn, either white or yellow, are produced in the more southern 
regions, while to a small extent in Michigan the flint corn is also 
grown upon this tj 7 pe. In Indiana the yields of corn range from 25 
to 60 bushels per acre, with an average yield of something over 40 
bushels per acre. In Michigan the yields range from 25 to 50 bushels, 
with an average of about 30 bushels per acre. In Ohio corn upon the 
Miami clay loam produces from 30 to 60 bushels per acre, with an 
average yield of about 40 bushels. In Wisconsin, the yield is 25 to 
40 bushels per acre, the average being about 35 bushels. In the areas 
where the Miami clay loam has been mapped in Indiana the acreage 
annually devoted to corn exceeds that devoted to any other grain 
crop, wheat being second in acreage and oats third. In Ohio the 
acreage devoted to corn is usually greatest, although in some instances 
this is exceeded by either wheat or oats, while in Michigan wheat is 
the crop' most extensively grown, with corn second in acreage and 
oats third. In general the Miami clay loam is not considered quite 
as good a corn soil as the Clyde silty clay loam, or the Marshall silt 
loam, when these occur in the same areas where the Miami clay loam 
is found. It is, however, an excellent corn soil measured by the aver- 
age yields produced, even in the great corn-growing region of the 
central prairie States, and with proper drainage and careful prepara- 
tion of the land annual yields averaging from 45 to 50 bushels may be 
expected. The corn is usually planted on sod which has been turned 
under, and not infrequently applications of stable manure are made. 
In general, the Miami clay loam occupies a region in west-central 
Ohio and east-central Indiana where the average production of corn 
is in excess of 40 bushels per acre. The only regions of any extent in 
which this yield is exceeded are those somewhat farther to the west, 
which are occupied mainly by the Marshall silt loam. Thus the 
Miami clay loam may be ranked as one of the important corn soils of 
the United States. 
The majority of the farmers consider the Miami clay loam even 
better suited to the production of wheat than to the growing of corn. 
Of the total area of the Miami clay loam which has thus far been 
mapped, the counties in which the type constitutes more than one- 
half of the total area show an acreage devoted to wheat only less 
than that devoted to corn, and the computed average yield of wheat 
per acre in such counties in Indiana and Ohio is slightly more than 
17 bushels. Wheat yields, ranging from 15 to 25 or 30 bushels per 
acre, have been reported in these States, and it is probable that the 
average for the Miami clay loam considerably exceeds the general 
