





THE MIAMI CLAY LOAM. 11 



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varieties of corn, either white or yellow, are;prduced in the more 

 southern regions, while to a limited extentxuf Michigan, the flint 

 corn is also grown upon this type. In Indian^-tfee yields of corn 

 upon the Miami clay loam range from 25 to 60 bushels per acre with 

 an average yield in excess of 45 bushels per acre. In Michigan the 

 yields range from 25 to 50 bushels, with an average yield 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, with 

 the average 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, although wheat 

 is second in acreage and oats are third. In Ohio, the acreage devoted 

 to corn is usually first, although in some instances this is exceeded by 

 either wheat or oats; while in Michigan the larger area of the type is 

 usually devoted to wheat, 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 Carrington black 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 average yields 

 produced, even in the great corn-growing region of the central prairie 

 States, and with proper drainage and careful preparation of the lands 

 annual yields averaging from 45 to 50 bushels may be expected. 

 The corn is usually planted upon old sod, which has been turned 

 under, and not infrequently applications of stable manure are also 

 made prior to the production of this crop. 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 which exceed this 

 yield are those somewhat farther to the west, which are principally 

 occupied by the Marshall silt loam. Thus the Miami clay loam 

 may be ranked as one of the dominant corn soils in the United States. 

 The majority of 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 

 by the Bureau of Soils 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 a trifle in 

 excess of 17 bushels. Wheat yields in these States have been reported 

 during the progress of the soil survey as ranging from 15 to 25 or 30 

 bushels per acre, and it is probable that the average for the Miami 

 clay loam considerably exceeds the average for the counties in which 

 it occurs, since in each case it constitutes the best wheat soil of the 

 area. Usually wheat is seeded upon ground where corn has been pro- 

 duced the previous year. The winter varieties only are grown, spring 



