| Straw
Mulching Specifications
Extent of Work
The
work included in this contract is as follows:
Straw Mulching of Roadside
Batters,etc on slopes generally less than 3:1.
Contractors Qualifications
Each
tenderer shall submit documentary evidence of his proven ability to carry
out this type of work. Such evidence shall include a list of similar projects
satisfactorily completed together with a statement of the qualifications and/or
experience of the personnel to be employed on the works.
Site Preparation
It
is recommended that whenever possible, areas to be seeded should be topsoiled.
Prior to topsoiling, the area should be ripped (up to 200mm deep). If topsoiling
is impracticable, the area should be ripped using a suitable machine or a
chain designed for this purpose. Wherever possible the area should be free
of weed growth, large stones or other debris.
Application Rates
The
required areas shall be treated by the Contractor with the following:
a. Certified Seed
Native Seed |
Minimum 60kg per hectare. The seed mix will vary according to the season,
soil condition and client requirement.
10-15kg of
selected species |
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b. Fertiliser |
200kg - 500 kg per hectare.
Selection will depend on soil analysis results and client requirements. |
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c. Straw |
Average bale
= 20kg. 250 bales per hectare ( minimum). |
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d. Binder
|
Anionic Bitumen Emulsion
50/50 bitumen water 1500 - 3500 litres per hectare.
Polymer binder maximum 350
litres per hectare.
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Note: The seed and fertiliser
rates are a representative sample only of the quantities that should be applied
per hectare.
Operation
Application of Seed
and Fertiliser
Seed
and fertilise can be sown in several ways but the method will depend on the
topography of the site.
On slopes less that 3:1
Apply by conventional tractor drawn sowing equipment or spread with spinner
broadcaster and then harrowed in. In some cases where the area is smaller,
seed and fertiliser can be spread by hand and raked into the surface.
On slopes greater than
3:1
Seed & Fertiliser should be hydroseeded through a hydromulching machine.
This method can also be used in those larger difficult and inaccessible areas
where conventional equipment could no operate or where it would not be safe
or prudent to hand broadcast the seed and fertiliser.
Note: Where lime or Gypsum
is required in some cases this can be applied in the same mix as the seed
and fertiliser. Higher quantities may need to be applied as a separate operation.
Application of Bitumen
and Straw
Straw
shall be applied through a Finn Straw mulching machine or machine designed
for this purpose that can operate in the same or similar way.
There are two approaches
Both the Straw and
Bitumen Emulsion can be applied at the same time through the Finn Straw Mulching
machine.
Straw can be applied as
a separate operation followed by an overspray of Bitumen Emulsion.
Note: In this approach
other binders, such as Polymer, can be used to tack down the straw.
Application rates for
this operation will vary according to the product used. The suggested rates
are as follows:
Liquid Polymer Binder
300 350 Kg per hectare Powder Envirotack 40 60 Kg per hectare
After Care Maintenance
Where possible,
water adequately to ensure a continuous vigorous and healthy growth of grass.
A great deal will depend on natural rainfall, but as a general guide, 25mm
of water should be applied to al seeded areas weekly. It is important that
the seed bed under the Straw Mulch Mat be kept moist until germination
occurs. After germination, sufficient watering must be kept up until a healthy
sward of grass is achieved.
If you would like any
additional information on this service, please
Contact Us.
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