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Quick Facts about Soil Preparation There
is no better time to enhance a lawn's ultimate beauty and success than
by improving the soil before any planting takes place.
Quick Fact - Why is Good Soil Important?
For optimum growth, turf needs just four things (in the proper balance)...sunlight,
air, water and nutrients. Reduce any of these, or provide too much of
any one and the grass may die or simply suffer. In the right proportions,
the grass will flourish, providing beauty to the landscape and a clean
and safe place to play plus many benefits to the environment.
Grass obtains three of the four essential factors
(air, water and nutrients) from the soil, but many soils are less than
ideal for growing grass. Some soils contain too much clay and may be very
compacted...great for roads, bad for grass, because air and water aren't
available to the roots and they can't grow. Other soils may have too much
sand...beautiful on a beach, but difficult to grow grass because water
and nutrients won't stay in the root zone long enough for the plant to
use. Another frequently observed problem with many soils is that its pH
(the degree of acidity or alkilinity) is too high or too low for optimum
growth.
Quick Fact - What is the Best Soil for Turf?
Loams, sandy loams and loamy sands, with a pH of 6.0 to 7.0 are the
very best soils for producing a beautiful, high-use, low-maintenance lawn.
Unfortunately, this ideal soil mixture is seldom found on any property
after construction.
Quick Fact - How Deep should the Soil be for Turf?
The absolute minimum quality soil depth for a carefree lawn is 4 inches
(10cm); however, for deeper root penetration and the benefits that that
brings, the accepted standard is 6 inches |15cm).
Quick Fact - Can Soils be Improved?
Practically, without exception, not only can most soils be improved,
they usually need to be improved to get the maximum results with only
a minimum of ongoing effort. The knowledge of what's necessary, the amount
and availability of materials and the immediate costs of time and money
are the factors that typically deter people from taking the steps necessary
to improve the soil. The fact is that failing to improve the soil before
planting is only inviting a much greater and continual investment of time
and money that will never return its value as fully as good preparation.
Benefits of Proper and Complete Soil Preparation
- Improved Uniformity
- Increased Density
- Faster recovery from wear
- Reduced use of Water Fertilizer and Pesticide
- Reduced Maintenance
Step-by-step Site Preparation
The beauty is in the blades, but the 'action' is in the roots,"
is a good adage to remember when growing grass. Thus, the value of proper
site preparation and soil improvement, before any planting takes place,
is that it will be easier for the grass roots to penetrate deeply and
evenly. Deep roots will make the lawn more drought resistant, a more efficient
water and nutrient user and more dense as new grass plant shoots emerge.
A dense lawn crowds out weeds and better resists insects and disease.
Follow these simple steps for a beautiful, healthy and trouble-free lawn:
1. Clear the site of all building materials.
(Wood,cement,bricks, etc.) as well as any buried stumps, rocks stones
or other debris that are larger than 2-3 inches (4- 5cm) in diameter.
2. Rough grade the entire area to eliminate any drainage problems
on the property.
This would include sloping the grade away from building foundations,
eliminating or reducing severe slopes and filling low-lying areas. A bobcat
is most often used for rough grading, but if the area is small, it can
be done with hand tools. The rough grading will probably uncover more
debris that should be removed and not buried.
3. Initial tilling to a depth of at least 2 inches or (5cm)
This should be completed prior to adding any topsoil or soil amendments.
This will control most annual weeds, alleviate subsoil compaction, permit
a bonding of the topsoil to the subsoil and improve root penetration as
well as air exchange and water movement.
4. Add topsoil to achieve a topsoil depth of 4-6 inches (I0-15cm)
after firming.
The topsoil should be loamy sand, sandy loam clay loam, loam, silt loam,
sandy clay loam or other soil suitable for the area. To the extent possible,
practical, affordable and available, incorporate humus (fully decomposed
organic matter) into the topsoil.
5. Test the soil pH with a chemical soil test to determine if any
pH correcting materials are required.
Acidic soils (pH of 6 and below) can be improved with the addition of
lime. The type (or source) and total amount of applied lime will be determined
by the level of acidity and should be based on the recommendations of
a reliable garden centre, turf professional or soil scientist. Alkaline
soils (pH of 7.5 and higher) can be improved with the addition of sulphur
of gypsum. As with acidic soil correcting materials, the type and total
amount of materials will be determined by the level of alkalinity and
should be based on a professional's recommendation.
6. Apply "starter fertilizer" that is high in phosphate,
("P" or the middle number on a bag of fertilizer), at a rate
recommended for the particular product. Crop King 88 or Dynamic Lifter
are suitable. To avoid root injury to the newly Installed turf, the fertilizer
should be raked into the top 3-4 inches(7-10cm) if time permits.
7. Finish grade the entire site,
maintaining the rough grading contours and slopes, with a bobcat mounted
level frame for large areas or a heavy duty rake and hand held level frame
for smaller sites.
8. Roll the area with a lawn roller one-third full of water to firm
and settle the surface.
Low spots revealed by this step should be filled to match the surrounding
grade surface. If time permits, allow the area to settle further with
rainfall or by applying irrigation water.
The site is now ready for turfing.
With this degree of careful and thoughtful soil and site preparation,
the resultant lawn will be absolutely beautiful. It will require less
maintenance...smaller quantities of water, fertilizer and pesticides...as
it maintains a high degree of density and recovers rapidly from wear.
© Cleveland Turf Supplies 2002

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