GROUP OF HARVEY SOILS. 
25 
and dairying. The chief crops grown are small grains, corn 
and hay. 
SUPERIOR SILT LOAM, ROLLING PHASE 
This type is of limited extent and therefore of minor impor¬ 
tance. The largest tracts occur southeast and southwest from 
Marion and north of Manawa. 
The surface soil of this soil to a depth of about 8 inches con¬ 
sists of a brown or light brown silt loam which contains only 
a moderate amount of organic matter. This is underlain by 
a grayish silt loam or silty clay loam which at 14 to 16 inches 
is underlain by the typical pinkish-red heavy clay which is 
characteristic of the Superior soils. This extends to a depth 
usually much greater than 3 feet, though frequently in the 
lower portion of the 3 foot section there may be thin layers of 
tine sand. A lighter color may also mark the heavy clay at 
this depth. The soil as a whole is quite uniform. The amount 
of stoniness is variable however. Some areas being entirelv 
stone free, while some have quite a number of bowlders upon 
the surface. 
The surface of this soil is gently rolling to rolling and the sur¬ 
face drainage is usually good. Along some of the lower slopes 
where the type adjoins lower lands there are small areas de¬ 
ficient in drainage. 
The original timber was the same as on the loam and fine 
sandy loam types of this series. Most of the merchantable tim¬ 
ber has been removed and the land placed under cultivation. 
Most of the land is well improved, and it is an excellent soil. 
It is easier to work than a clay loam but sufficiently heavy to 
retain moisture well and also the fertilizing material which may 
be applied to it. The same crops are grown as on the loam soil, 
the same methods are followed, and the same line of improve¬ 
ment will apply. 
CHEMICAL COMPOSITION AND FERTILITY OF SUPERIOR CLAY LOAM, 
SUPERIOR SILT LOAM AND SUPERIOR SILT LOAM, ROLLING PHASE 
The chemical analyses of the Superior silt loam and clay loam 
soils show that their phosphorous content is somewhat lower 
than the average of other silt loams and clay loams in the State, 
while the potassium content is considerably larger. Their con- 
