- in acid
soils.
Soil organisms are
hindered by high acidity, and most
agricultural crops do best with
mineral soils of pH 6.5 and
organic soils of pH 5...
-
number of
decisions that
depleted the
soils, including:
allowing herd
animals to
wander freely, not
replenishing soils with manure, and a
sequence of events...
-
naturally saline soils. This is the case, for example, in
large parts of Australia.
Human practices can
increase the
salinity of
soils by the addition...
- in
soils or
water layers submerging soils. The
water is
present either permanently or
cyclic within the time
frame of 24 hours. Some
organic soils float...
-
soils have a pH
below 7 and
alkaline soils have a pH
above 7. Ultra-acidic
soils (pH < 3.5) and very
strongly alkaline soils (pH > 9) are rare.
Soil pH...
- Alkali, or Alkaline,
soils are clay
soils with high pH (greater than 8.5), a poor
soil structure and a low
infiltration capacity.
Often they have a hard...
- or
poorly graded.
Poorly graded soils are
further divided into uniformly-graded or gap-graded
soils. Fine-grained
soils,
mainly silts and clays, are classified...
-
properties of
soils; and
these properties in
relation to the use and
management of
soils.
Sometimes terms which refer to
branches of
soil science, such...
- capacity; however, the
fertility of
these soils can be
optimized with
liming and
other farming techniques. Red
soils are an
important resource because they...
- loading. This may
occur in all
soil types including dense soils. However, on
reaching a
state of zero
effective stress such
soils immediately dilate and regain...
