Page [Plate 1]

                                            ALFISOL ORDER
                                          (Gray-Brown Podzolic,
                                           Gray Wooded soils;
                                          deciduous forest soils)
MOLLISOL ORDER
(Brunizems, Humic
Gleys; soils with
deep black epi-
pedon, i.e. top-
soil)
     INCEPTISOL ORDER
     (Low Humic Gleys;
      weakly developed soils)
     SPODOSOL ORDER
      (Podzols; coniferous
        forest soils)
  ENTISOL ORDER
(Lithosols, Regosols,
alluvial soils; primitive
soils)
Figure 5-1, in color. Circular key to the new USDA soil classification for
Wisconsin, coded in color to indicate, in each instance, a key feature of
the
soil or environment. The very poorly drained organic soils, represented here
in blue, are normally found saturated with water in hogs and marshes; the
Fibrists are assumed to be the wetlest of the three suborders of Histosols.
The poorly drained mineral soils (Aqualfs, Aquods. etc.) are colored green
here to indicate the abundance of vegetation on them. Alluvial soils (Fluvents)
and upland prairie soils (Udolls) are less wet, but even so support
rather vigorous plant growth. The sands (Psamments) are droughtv; Ochrepts
may be thought of as a degree less droughty. tmportant upland forest
soils are portrayed in the three remaining suborders: Podzols (Orshods) commonly
have reddish-brown B horizons, Boralfs have less of a reddish tinge
in claycy B horizons, and ljdalfs have brown to yellowish-brown claycy B
horizons. The chart may be visualized as a funnel with the wettest soils
at the
center and the driest ones at the periphery.