United States
Environmental Protection
Agency
Solid Waste
and Emergency Response
(5306W)
EPA530-F-97-043
October 1997
www.epa.gov
Innovative Uses of Compost
Erosion Control, Turf
Remediation, and Landscaping
ompost has been viewed as a valuable soil amendment for
centuries. Most people are aware that the use of compost is an
effective way to improve plant growth. Compost-enriched soil
can also reduce erosion, alleviate soil compaction, and help
control disease and pest infestation in plants. These beneficial uses of
compost can increase healthy plant production, help save money, reduce
the use of chemical fertilizers, and conserve natural resources.
Compost used for a specific purpose or with a particular soil type
works best when it is tailor-made or specially designed. For example,
compost that is intended to prevent erosion might not provide the best
results when used to alleviate soil compaction, and vice versa. Technical
parameters to consider when customizing a compost mixture include
maturity, stability, pH level, density, particle size, moisture, salinity, and
organic content, all of which can be adjusted to fit a specific application
and soil type.
Compost Technology to Control Erosion
ccording to the U.S. Department of Agriculture, the United
States loses more than 2 billion tons of topsoil through ero-
sion each year. Erosion occurs when wind and rain dislodge
topsoil from fields and hillsides. Stripped of its valuable top
layer, which contains many essential nutrients, the soil left behind is
often too poor to sustain good plant growth. Eroded topsoil can also be
carried into rivers, streams, and lakes. This excess sediment, sometimes
containing fertilizers or toxic materials, threatens the health of aquatic
organisms. It can also compromise the commercial, recreational, and aes-
thetic value of water resources. As a result, preventing erosion is essen-
tial for protecting waterways and maintaining the quality and
productivity of soil.
) Printed on paper that contains at least 20 percent postconsumer fiber.
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Controlling Erosion in Construction
and Road Building
Erosion is a naturally occurring process; howev-
er, it is often aggravated by activities such as road
building and new construction. At the beginning
of some construction projects, all vegetation and
topsoil is removed, leaving the subsoil vulnerable
to the forces of erosion. On steep embankments
along roads and highways, compost can be more
effective than traditional hydromulch at reducing
erosion and establishing turf because compost
forms a thicker, more permanent growth due to its
ability to improve the infrastructure of the soil.
Depending on the length and height of a partic-
ular slope, a 2- to 3-inch layer of mature compost,
screened to 1/2 to 3/4 of an inch and placed
directly on top of the soil, has been shown to con-
trol erosion by enhancing planted or volunteer
vegetation growth. On steep slopes, berms
(mounds) of compost at the top or bottom of
slopes can be used to slow the velocity of water
and provide additional protection for receiving
waters. Because of its ability to retain moisture,
compost also helps protect soil from wind erosion
and during droughts. ^ A
I Controlling Erosion in Road Construction
The Federal Highway Administration (FHWA), of
the U.S. Department of Transportation and the
U.S. Environmental Protection Agency, recently
conducted an erosion control demonstration project
that compared mature yard trimmings compost that
met FHWA specifications with hydromulch, a sub-
stance traditionally used for controlling erosion on
roadside embankments. The purpose of the study
was to determine the effectiveness of mature yard
trimmings compost compared with hydromulch in
establishing Fescue grass.
The project site was at a newly constructed inter-
section in suburban Washington, DC. Two
embankments with steep slopes were selected.
The first embankment had a 2 to 1 slope; the sec-
ond had a 3 to 1 slope. A hydromulch/fertilizer
treatment also was applied to a section of each of
the slopes. Adjacent to these sections, 2-1/2 inch-
es of mature yard trimmings compost was spread.
On the 2 to 1 slope, a small amount of fertilizer
was also applied, while the 3 to 1 slope was left
unfertilized. Fescue grass seed was added and
covered with a thin layer of compost to conceal the
seed from birds.
-Rain
Field Water
.Compost Berm 4
4
4
Layer of Compost
Compost Berm
On steep slopes, berms (mounds) of compost at the top or bottom of slopes can _____
be used to slow the velocity of water and provide additional protection for receiving waters.
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Photos courtesy of The Federal Highway Administration, Office of
Environment &• Planning, and Federal Lands Highway Program
Embankment adjacent to new intersection. Top left photo
shows hillside before seeding. Photo at right shows grass
cover. Compost-treated plot displays darker green color and
thicker growth.
Results of the project revealed that compost used
alone produced better results than either of the
areas treated with hydromulch or the area treated
with compost and fertilizer. While the areas with
the hydromulch/fertilizer combination showed quick
initial vegetative growth, the areas treated with only
compost persevered within 6 months, out-perform-
ing the traditional method by establishing a thick,
healthy vegetative cover. The growth in the com-
post/fertilizer plot was superior to that found in the
hydromulch/fertilizer plots. A possible explanation
for compost alone out-performing the area treated
with compost and fertilizer is that chemical fertiliz-
ers often increase soil salinity, which in turn could
negatively affect the beneficial micro-organisms in
compost and inhibit the establishment of healthy
grasses.
Using Compost to Remediate
Turf Grasses
Hroviding safe, uniform playing surfaces
for recreational activities, such as golf,
football, soccer, and other field sports,
requires intensive turf management.
Recreational turf grasses are subjected to
extensive wear and tear, making them difficult to
manage and highly susceptible to turf diseases,
pests, and soil compaction. To address these prob-
lems, turf managers traditionally use a combination
of fertilizers, pesticides, fungicides, and aeration
techniques that usually result in high costs and
potential for negative environmental impacts.
Some turf managers are now using compost to
replace peat moss in their topdressing applications
based on its proven success in suppressing plant
disease. Compost, when properly formulated,
unlike peat moss, is teeming with nutrients and
micro-organisms that stimulate turf establishment
and increase its resistance to common turf diseases,
such as snow mold, brown patch, and dollar spot.
For example, after 3 years of using compost as a
topdressing, the Country Club of Rochester, New
York, has nearly eliminated the need for fungicide
applications for such diseases.
Alleviating Soil Compaction
Soil compaction is another persistent landscape
management problem, particularly in areas of heavy
traffic, such as parks, zoos, golf courses, and athlet-
ic playing fields. Compacted soil impedes healthy
turf establishment by inhibiting the movement of
air, water, and nutrients within the soil. Bare soil,
weeds, increased runoff, and puddling after heavy
rains are the most obvious signs of a soil com-
paction problem.
Traditional methods for alleviating soil com-
paction—aeration, reseeding, or complete resod-
ding—are labor-intensive and expensive, and
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I What Are the Benefits of Using
Compost?
Soil Enrichment:
• Adds organic bulk and humus to regenerate
poor soils.
• Helps suppress plant diseases and pests.
• Increases soil nutrient content and water
retention in both clay and sandy soils.
• Restores soil structure after reduction of
natural soil microbes by chemical fertilizer.
• Reduces or eliminates the need for fertilizer.
• Combats specific soil, water, and air problems.
Pollution Remediation:
• Absorbs odors and degrades volatile organic
compounds.
• Binds heavy metals and prevents them from
migrating to water resources or being
absorbed by plants.
• Degrades, and in some cases, completely elim-
inates wood preservatives, petroleum products,
pesticides, and both chlorinated and nonchlori-
nated hydrocarbons in contaminated soils.
Pollution Prevention:
• Avoids methane production and leachate
formation in landfills by diverting organics for
composting.
• Prevents pollutants in stormwater runoff from
reaching water resources.
• Prevents erosion and silting on embankments
parallel to creeks, lakes, and rivers.
• Prevents erosion and turf loss on roadsides,
hillsides, playing fields, and golf courses.
Economic Benefits:
• Results in significant cost savings by reducing
the need for water, fertilizers, and pesticides.
• Produces a marketable commodity and a
low-cost alternative to standard landfill cover
and artificial soil amendments.
• Extends municipal landfill life by diverting
organic materials from the waste stream.
• Provides a less costly alternative to
conventional bioremediation techniques.
provide only short-term solutions. Some turf man-
agers are starting to use compost and compost
amended with bulking agents, such as aged
crumb rubber from used tires or wood chips, as
cost-effective alternatives. Incorporating tailor-
made composts into compacted soils improves
root penetration and turf establishment, increases
water absorption and drainage, and enhances
resistance to pests and disease. Using tailored
compost can also significantly reduce the costs
associated with turf management. Research con-
ducted at a U.S. Air Force golf course in Colorado
Springs, Colorado, for example, indicated that turf
grown in areas improved with tailored compost
required up to 30 percent less water, fertilizer,
and pesticides than turf treated conventionally.
I Greening the Links
The U.S. Army Golf Course Operations Division
at Fort George Meade, Maryland, and the U.S.
Environmental Protection Agency began a 3-year
pilot demonstration in 1995 to determine the effec-
tiveness of compost amended with crumb rubber
in alleviating soil compaction, erosion, and turf dis-
ease problems. The golf course superintendent esti-
mates that using compost technology would save
nearly $50,000 a year in maintenance costs.
Photo courtesy of U.S. Army, Fort George Meade, Maryland
At the U.S. Army Golf Course at Fort George Meade,
Maryland, erosion can clearly be seen on the untreated right
side of the path, while rubber amended compost is helping
keep erosion in check on the left.
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Mature yard trimmings compost amended with
crumb rubber was incorporated into compacted
soils at 13 different locations around the two golf
courses. Many of the selected sites included areas
adjacent to, or at the end of golf cart paths, on
slopes surrounding greens, or in tee boxes. These
sites were selected because of their susceptibility
to compaction and erosion caused by heavy traffic
and water runoff. The compost mixture was tilled
into the soil to a depth of about 3 to 5 inches and
then uniformly seeded. To act as a control, one of
the plots was amended only with crumb rubber.
In the first year of the pilot, course operators report-
ed that healthy, green turf grass took hold at most of
the sites, with no signs of compaction or erosion.
Results were particularly impressive in eroded ditch-
es along cart paths. The areas treated with the com-
post mixture showed full growth of turf grasses and
total abatement of erosion, whereas the plot amend-
ed only with crumb rubber showed few signs of
improvement.
Using amended compost
can significantly reduce
the costs associated with
turf management
Using Compost in
Landscaping Activities
upplies of high-quality, low-cost top-
soil are declining, particularly in urban
areas where the demand is greatest.
Compost is, therefore, becoming partic-
ularly important in applications requir-
ing large amounts of topsoil. Increasingly,
compost is being used as an alternative to natural
topsoil in new construction, landscape renova-
tions, and container gardens. Using compost in
these types of applications is not only less
expensive than purchasing topsoil, but it can
often produce better results when trying to estab-
lish a healthy vegetative cover.
After a lawn or garden has been established,
maintaining it can be a challenge for both home
gardeners and commercial landscape contractors.
While aeration, topdressing, and chemical fertil-
izer applications are some of the techniques com-
monly employed in landscaping applications,
compost can be a successful alternative. When
used as a topdressing, or periodically tilled into
the soil, compost can stimulate plant growth,
reduce pests and plant infestation, and improve
soil structure.
Compost is also an effective landscaping
mulch. Placed over the roots of plants, compost
mulch conserves water and stabilizes soil tem-
peratures. In addition, compost mulch keeps
plants healthy by controlling weeds, providing a
slow release of nutrients, and preventing soil loss
through erosion. Landscapers and gardeners also
use compost as mulch because its dark, rich
color accents the vibrant colors of flowering
plants.
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I Landscaping Constitution Gardens
In 1973, the U.S. National Park Service used a
compost mixture made of digested sewage
sludge, wood chips, leaf mold, and a small
amount of topsoil to transform a badly compacted
40-acre tract of land located in Washington, DC,
into a landscaped park. This project is one of the
earliest successful large-scale landscaping appli-
cations using compost.
The original plans for the park renovations
included planting azalea beds and thousands of
annuals around a 6-acre lake. However, the site
assessment revealed that the soil was almost as
hard as concrete, with little pore space for plant
roots and for water infiltration. The soil was too
low in nutrients for healthy plant growth. In addi-
tion, the water table was high, causing flooding
and root rot in existing plants.
Park Service staff spread over 9,400 cubic yards
of the compost mixture over the site. Fertilizer,
woodchips, and seed were added, and the soil
was tilled to a depth of 2 feet. Impressed by the
hardiness and beauty of a stand of hardwood
trees along the area's western edge, Park Service
staff decided to plant several varieties of native
trees rather than the planned azalea beds. Data
taken 3 years after the project ended indicated
that most of the nearly 2,000 trees initially planted
had flourished in the park.
Photo courtesy of U.S. National Park Service
More than 9,400 cubic yards of compost was used to
remediate heavily compacted soil at Constitution Gardens
in Washington, DC.
Photo courtesy of U.S. National Park Service
Three years after compost was applied, the vegetation at
Constitution Gardens flourishes.
The compost use in this project not only
improved the quality of the existing soil, but also
saved taxpayers over $200,000. Park Service staff
also reviewed other options for remediating the
soil at the park, including the purchase of topsoil
to spread over the existing poor soil. If the Park
Service staff had chosen to use topsoil, the cost of
the project would have doubled.
I Using Compost for Rooftop Gardens
Several years ago, officials at Pace School in
Pittsburgh, Pennsylvania, proposed building a
playground and garden for their students. They
soon discovered, however, that the only space
available was on the school's roof, so they
designed a unique rooftop garden.
Plans for the garden included building large,
6-foot deep planters. Before the planters were
constructed, several important factors had to be
taken into consideration. The planter mix used had
to be light enough for the roof to withstand the
weight, yet dense enough to prevent rapid evapo-
ration caused by the wind and summer heat. In
addition, the planter mix had to be able to endure
freezing temperatures in winter, and provide ade-
quate drainage to prevent the planters from over-
flowing during rainstorms.
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Photo courtesy of AgRecycle Inc.
Tailor-made compost was the key to success for the rooftop garden at Pace School in Pittsburgh,
Pennsylvania.
To meet these special needs, the school decided
to use a tailor-made mature compost blend,
chosen because its bulk density is much lighter
than soil-based mixes. The compost mix is also
extremely absorbent, maintains good drainage,
and protects plant roots from climatic fluctuations.
A local compost producer tailor-made a mature
yard trimmings compost mixture to meet the
project's specifications. A layer of polystyrene
packaging peanuts was placed in the bottom of
each planter box to enhance drainage, and a
5-foot layer of the compost mixture was placed on
top.
Four years after the project began, the school
continues to use its rooftop garden for a number
of activities, including teaching science classes
and gardening methods. The compost has per-
formed very well as a growing medium and contin-
ues to produce beautiful, healthy plants that both
the students and teachers can enjoy.
I Using Compost in Landscape Maintenance
Each year, millions of people visit Point State
Park in Pittsburgh, Pennsylvania. Heavy traffic
and 12 continuous years of chemical fertilizer
applications caused the park's grassy areas to
become increasingly compacted, eroded, and
depleted of vital nutrients.
After considering several options, park officials
decided to aerate the grassy areas and apply a
special blend of mature yard trimmings compost
and fire calcined clay. This compost mixture was
designed to alleviate compaction, add nutrients to
the soil, and to improve water-holding capacity.
Workers spread a 1/4-inch topdressing of the
compost mixture and then uniformly applied grass
seed. Soon after the compost was applied, park
officials noted that the turf was healthier and that
the soil no longer exhibited signs of compaction.
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References
Cazenas, P. and R.E. Green. 1997. Erosion preven-
tion on steep enbankments by mature yard trim-
mings compost compared to hydromulch.
Washington. (In manuscript).
Castagnero, C. 1996. Conversation with Dr. R.E.
Green. Establishment of Pace School Rooftop
Garden with the use of tailored, mature compost.
Pittsburgh.
—. 1996. Conversation with Dr. R.E. Green.
The use of mature compost in state park landscape
maintenance. Pittsburgh.
Federal Highway Administration. 1996. Standard
Specifications For Construction of Roads and
Bridges on Federal Highway Projects, U.S.
Department of Transportation. FP-96, Sec. 713,
p.719.
Lincoln, T. Rebound—the New Product Turf
Managers Dream About, Jai Tire Industries. Denver.
Nelson, E.B. 1992. The biological control of turf-
grass diseases. Golf Course Management.
April: 78-90.
Patterson, J. 1994. The successful remediation of
severely-compacted soil at the U.S. Constitution
Gardens. Paper presented at a workshop in
Washington.
Wilkinson, J.F. 1992. Applying compost to the golf
course. Golf Course Management. April: 78-90.
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