- 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...
-
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...
-
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...
-
number of
decisions that
depleted the
soils, including:
allowing herd
animals to
wander freely, not
replenishing soils with manure, and a
sequence of events...
- 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...
- capacity; however, the
fertility of
these soils can be
optimized with
liming and
other farming techniques. Red
soils are an
important resource because they...
-
laterite soil, or arid soil, and
forest and
mountainous soil,marsh soil.
These soils are
formed by the
sediments brought down by the rivers. They also have varied...
- groups: (1) co****-grained
soils (e.g.
sands and gravels); (2) fine-grained
soils (e.g.
silts and clays); and (3)
highly organic soils (referred to as "peat")...
-
contaminated soils. The same
amount of
contaminant can be
toxic in one
soil but
totally harmless in
another soil. This
stresses the need for
soil-specific...
-
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...
