INEXPERIENCED
 TEACHERS
(County tlemfstdrySc&A os 1933)


IS


15 -


12 -


9


6


3


PER


RICH SOIL AREAS


 PLATE V
 Showing the percentage of one room schools, and in-
 experienced teachers on poor soil compared to rich
 soil.
 (Courtesy, Tennessee Valley Authority.)

races on stiff and heavy soils because of insufficient power on
the farm. Such soils are usually most subject to erosion. This
may be seen in the rolling piedmont areas of the cotton belt
where erosion has destroyed millions of acres of farm land.
(See Plate VII. Upper right.) The sloping lands in West Florida
are also subject to serious erosion losses.

 Erosion control measures consist very largely in keeping the
vegetative cover on the land as much as possible. This means
that those crops which are most aggressive are the most useful
in soil conservation. Grasses are soil binding plants and are
among the most effective soil conserving crops. Areas with a
slope of more than fifteen per cent should be retired from culti-


I.


II I


IP L AREAS
POOR 501L AREAS


I