There are
many management techniques that can help to heal urban soils. Below
are various application methods for reducing compaction and amending
soils in an urban environment. This work can be done at various scales
and by anyone from the developer to the homeowner. It is important
to remember these techniques are not always suitable for every urban
situation.
Adding Fill: Adding fill or amended topsoil over compacted
soils is pretty. Without preparation before application aeration
moisture problems develop. The compacted layer must be tilled before
fill is added. A minimum of 6-inches ensures uniformity of texture.
Rototill: This is a smaller scale treatment that treats
the soil at depth of about 4 to 6 inches. Can become a problem if
used consistently for cultivation because it creates an interface
between the fluffed soil and the soil beginning at the end of the
tiller's teeth. This can lead to poor conditions.
Inorganic Amendments: There are various inorganic amendments
on the market such as Greensandâ, Axisâ, Profileâ,
pumice, and ceramic products, but none stand out as long-term solutions
to soil degradation and compaction and have varying application
procedures.
Ripping: Plow in two direction to ensure uniformity of treatment
then irrigate and allow to settle itself for 2 to 3 weeks. Once
stabilized do final grading and planting. This treatment is generally
not acceptable on development sites because large trees are developed.
Radial Trenching: Remediates soils where delicate tree roots
are present. Beginning at the edge of the tree drip line, soil is
mechanically removed from radially oriented trenches 2 feet in depth
and 12 inches in width. It is important to avoid the main roots
of the tree and orient trenches in between main anchors. Replace
material with a porous soil amendment.
Vertical Mulching: Holes and fractures can be created to
increase air space. Injection of water or air physically auguring
openings 2 inches in diameter holes at 18 inches in depth. These
voids are then filled with mulches or gravelly, porous material.
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