38 
SOIL SURVEY OF OUTAGAMIE COUNTY. 
use of lime on the fields as they are sown to clover as soon as it 
becomes difficult to secure a good stand. 
The Superior and Miami soils of this group have been derived 
from materials which contain varying amounts of lime carbon¬ 
ate. The subsoils are usually well supplied with lime, but the 
surface soils frequently show varying degrees of acidity, due 
partly to the long period of leaching to which they have been 
subjected. The degree of acidity is seldom as great as on the 
Antigo soils, however. 
These types of soils are well adapted to general farming and 
some special crops such as potatoes can also be grown to good 
advantage. These soils which are of intermediate texture are 
better adapted to potato culture than are the heavier types on 
the one hand or the light sandy soils on. the other. It is neces¬ 
sary to give these soils somewhat more attention to maintain 
their fertility than the heavier types partly because they are 
lower in fertility, but more because of the fact that these special 
crops require a higher degree of fertility to produce satisfactory 
yields. When these soils are used for special crops the fertility 
can best be maintained by rather heav} r applications of stable 
manure, or through the use of a rotation in which a legume is 
grown as the means of securing the organic matter and nitrogen, 
while the other elements chiefly phosphorus and potassium, are 
supplied in the form of commercial fertilizers. When the latter 
system is used one-third or one-fourth of the land should be 
sown to a legume and a part of the commercial fertilizer used 
on this crop. The fertility used in this way would become 
available to succeeding crops through the decomposition of the 
legume when plowed under. The remainder of the fertilizer 
would be applied at the time of fitting the soil for the succeeding 
crops. 
