Thomas County cat. [volume] (Colby, Kan.) 1885-1891, 1886-09-02
COMPOSITION OF SOILS

Study Which Every Intelligent Land.
Owner Should Pursue.
There is no more important study for
the farmer than careful study of his
soil. While soils are composed OF three
distinct constituents-sand, clay and
humus-yet these vary greatly in their
composition. All soils, AZ far as their
inorganic materials are concerned. were
originally composed by the breaking
down and decomposition of rock.
Sands result from the decomposition of
quartz, or other rock containing quartz
or silica in some form, and the compost
ton of each individual grain is that Of
the rock from which it was formed.
Soils formed of granite are among the
most productive known. Why? Gran
lite is composed of quartz, feldspar and
mica. The quartz is pure slick, so
necessary for the proper division Of
soils. Feldspar again consists of silica,
alumina and potash. Alumina is the
base of clay, just as the metal illuminum
is the base Of alumina, alupina being
an oxide of aluminium, anRis the char
acteristic ingredient in all clays. With
out il soils could not be combined and
held together. With too much alumina
it becomes too dense, hard and impervi-
GUS both to wafer and the roots of
plants.
Humus is any organic matter in pro-
cess of decay or in that state when re-
duced to an impalpable powder. Prai-
RE soils contain great deal of humus
that seems to have been deposited when
the soil was underwater or partially So
So the fact that these soils. as a rule.
are largely composed of clay. are due
their fertility and lasting qualities, the
dark color of the soil being due to
humus, and also to the effects of burn
ing of the vegetation year after year.
Soils are generally classed as sandy,
loamy, clayey, mucky and peaty, the
latter being formed in marshy land I'M
der water Our very black prairie soils
containing much clay and vegetable
matter, are often designated muck. A
distinctly clay soil is that composed of
pure clay. Pure sand has no fertility,
pure clay can not be classed as fertile,
and peaty soils are not fertile until they
have long been unearthed by careful,
thorough drainage.
Mixtures of sand and clay are our
most fertile soils. They are classified
as loan when they contain equal vol
umes of sand and clay, as sandy loan
when about seventy-tive per cent. is
sand, and as clay loan when about
per cent. is clay. As soils
approach either of these conditions they
are classed with that to which they re-
late most closely.
The province of humus in the soil is
twO-fOld; to render the soil light and
mellow, though its principa! value is
the power that humus possesses of de-
and rendering soluble the
valuable constituents of the soil, es-
pecially those of potash with nitrogen.
Humus is formed by the action of the
air on solid animal or vegetable matter.
In fact, it is a process of exceedingly
slow combustion, as much as five hum
dred years being considered necessary
to reduce a large oak to humus in the
natural progress of decay. During all
this time, however, such portions as
are gradually converted into humus are
performing their natural functions in
the soil. One of the most important is
the conservation of nitrOgen-the most
costly, as it is the most easily dispelled
of the organic products. Under the
action of heat and moisture nitrogen
combines with the potash of the soil.
forming nitrate of pOtassa, the common.
name of which is saltpeter.
From the foregoing the farmer may
BY careful observation estimate the
value and character of his soil, and
hence the proper crops to- be used. and
also the manures necessary to increase
productiveness. A sandy soil may be
rendered productive by the addition OF
clay. Ten per cent. of clay will con-
vert it into sandy loan. But pure
clay can not be rendered productive by
the addition of sand. 1t would require
at least twenty-five per cent. of sand to
convert it into stiff clay loam.. Pure
clay freed from uncom lined silica con-
sists of alumina 44.5, silica 40 and
water 15.5 parts in 100. But except in
rare cases it is not found, except COM
bined more or less. with free. Silica or
sand. Chicago Tribune.