- gardening,
hardpan or soil pan is a
dense layer of soil,
usually found below the
uppermost topsoil layer.
There are
different types of
hardpan, all sharing...
-
vernal pools have an
underlying impermeable clay
layer (also
known as a
hardpan) that
reduces water percolation. The
impermeable layer is
hydrophobic and...
-
restrictions ****ociated with
having a
shallow hardpan soil, as the
tillage radish can
break the
hardpan,
making the
transfer of
water and
other important...
-
Joaquin soils formed in old
alluvium on
hummocky topography. A
cemented hardpan a few feet
beneath the
surface restricts roots and
water percolation. San...
- problem. In
agriculture angled wings are used to lift and
shatter the
hardpan that
builds up due to compaction. The
design provides deep tillage, loosening...
- over
nearby low-lying areas. When the
lakes dry up, they
leave a
crust or
hardpan behind. This area of
deposited clay, silt or sand is
known as a playa....
- More than one
quarter of Kahoʻolawe has been
eroded down to
saprolitic hardpan soil,
largely on
exposed surfaces near the summit. Historically, Kahoʻolawe...
-
infertile lower soil
layers that bake in the sun and
become an
unproductive hardpan. This
spread of arid
areas is
caused by a
variety of factors, such as overexploitation...
-
organic matter, clay and sand. A
subsoil of gravel, or the
presence of
hardpan, is not desirable, as
cultivation to a
depth of from 12 to 15
inches (30...
- a
garden tool used to
manually break up
densely packed soil,
including hardpan, to
improve aeration and drainage.
Broadforks are used as part of a no-till...
