Hydromulching

In 1969 Spraygrass Landscapes pioneered the commercial use of hydromulching

Hydromulching is a one-step process where seed, fertiliser and mulch and a binder/tackifier are combined together in water. The resulting slurry is sprayed onto the soil surface providing a wood fibre interlocking mat that retains moisture for seed germination.

The mulch is dyed green with a non-toxic dye to help identify areas requiring ongoing treatment. This dye usually fades out of the fibre as growth of the seed cover crop advances.

On difficult slopes, additional Binders may be used to increase the effectiveness of the application. Hydromulching is best suited to higher rainfall areas such as coastal regions.

Hydromulching using Australian Native Seed
Although a large proportion of our work is carried out using grass seed, there is an increasing demand for the hydromulching of disturbed areas with seeds of Australian native trees, shrubs and creepers. Spraygrass were first in offering this additional service, realising that not only was there a need to maintain the natural beauty of the Australian environment, but that only native vegetation would grow and flourish in some areas. The use of native species is especially suited to the revegetation of mine overburden and disturbed areas in national parks and adjacent areas.

Extent of Work
The work included in this contract is as follows:-

Revegetation of Roadside Batters on slopes generally less that 3:1

Contractors Qualification
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 Grass Seed Minimum 60kg per hectare. The seed mix will vary according to the season, soil condition and client requirement.
b. Fertiliser 200kg – 500 kg per hectare.  Selection will depend on soil analysis results and client requirements.
c. Wood Fibre Mulch (Dyed green) 2 – 2.5 tonnes per hectare.
d. Binder Envirotack at 40kg 60 kg per hectare or Polymer binder maximum 250 litres per hectare

Note: The seed and fertiliser rates are a representative sample only of the quantities that should be applied per hectare.

Operation
Seed, fertiliser, wood fibre mulch, water and binder shall be thoroughly mixed together with water to provide a slurry and then applied under pressure onto the area to be treated by means of hydromulching equipment specifically designed for this purpose and by operators trained in the use of this equipment.

After Care Maintenance
Where possible, adequate water should be applied to ensure a continuous and healthy growth of grass. A great deal will depend upon natural rainfall, but as a general guide, 25mm of water should be applied to all seeded areas weekly. It is important that the wood fibre mulch be kept moist until germination occurs. After that, sufficient watering must be kept up until a healthy sward of grass is

Extent of Work
The work included in this contract is as follows:

Native Seeding of Roadside Batters etc

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.

Hydromulching
The application of Hydromulching Native seed shall commence immediately after topsoil has been placed or the surface prepared.

Application Rates
The required areas shall be treated by the Contractor will the following:

a.Native Seed 5 – 15 kgs per Hectare
b. Cover Crop Seed 25 – 35 kgs per Hectare
c. Fertiliser 200kg – 500 kg per hectare.  Selection will depend on soil analysis results and client requirements.
d. Wood Fibre Mulch (Dyed green) 2 tonnes – 2.5 tonnes per hectare.
e. Binder Envirotack at 40kg 60 kg per hectare or Polymer binder maximum 250 litres per hectare

Note: The seed and fertiliser rates are a representative sample only of the quantities that should be applied per hectare.

Operation
Seed, fertiliser, wood fibre mulch, water and binder shall be thoroughly mixed together with water to provide a slurry and then applied under pressure onto the area to be treated by means of hydromulching equipment specifically designed for this purpose and by operators trained n the use of this equipment.

After Care Maintenance
Where possible or practicable watering of the seeded area should be carried out. In this situation the wood-fibre should be kept moist until a satisfactory germination occurs. After this, sufficient watering must be kept up until the native plants have reached a stage where they can survive in their own right.

Note: Seed Preparation
1. The seeds of many Australian Native Species have a hard outer covering that must be removed or softened before germination can take place. Nature relies on bush fires to assist germination of some species by splitting the outer coating with heat. With the hydromulching technique, we immerse the hard seeds (eg Acacia) in boiled water and leave them to soak for up to 24 hours before planting.
2. In this operation the germination of Australia Native Species is not reliable and therefore can take up to 3 to 12 months before a result is achieved.

Why Spraygrass?

Spraygrass applications and techniques are appropriate for:
• Road-side batters
• Dam sites
• Bridge approaches and abutments
• Factory and shopping complex sites
• Powerline construction
• Mining sites
• Golf Courses
• Land subdivisions
Spraygrass has been operational for over 45 years, demonstrating quality workmanship and commitment to our customers.
Spraygrass is dedicated to providing excellence in workmanship using the highest quality products available to create complete customer satisfaction. This is achieved through teamwork, which ensures all staff are part of the Company and motivated in the same direction of continuous improvement to achieve success in all they do, from the Managing Director to field staff