Hydromulching is a one-step process that involves spraying a slurry of water, seed, fertiliser, cellulosic mulch, tracking dye and a binder/tackifier from a specially designed hydroseeding truck, referred to as a hydroseeder, that keeps this mixture agitated during application, ensuring even coverage. Depending on the hydroseeder, the cannon, also referred to as a boom, is capable of spraying the mixture in excess of 100 metres, enabling coverage in even the most difficult to reach areas.
The addition of mulch into the slurry is what differs hydromulching to hydroseeding and provides a number of benefits. Firstly, the mulch acts as a hydraulic growth medium and provides a protective cover and moisture reservoir for the seeds as they wait to germinate. It can increase the soil temperature and also stop birds from getting to the seed before it sprouts. Secondly, when commonly used in combination with a binder/tackifier the fibres will stick together and “hold onto” the ground which provides erosion control in the short term. During the waiting period for the seed to strike, this surface cover works to stop the wind from picking up dust and displacing the seed while aiding in rain and water run-off from eroding the topsoil, hindering growth. Depending on seed choice, time will vary for seed germination.
Hydromulching is an effective and viable option for vegetating large expanses of land quickly and easily, whether they are flat, hard to access or significantly sloped. Hydro mulching solutions can be used for erosion control and stabilisation of road side batters, soil stockpiles, long term dust suppression, mine site rehabilitation and remediation of large industrial areas.
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Hydromulching is a process where a mixture of seed, fertilisers, mulch, binder and water are sprayed on to the site to be revegetated.
Revegetation Contractors recommends Hydromulching for sites with limited access for machinery. It is particularly suited to revegetating steep banks such as road batters and the awkward slopes of creeks and drains. The special binders added to the slurry ensure the mixture adheres to the slope.
Before applying the Hydromulch, Revegetation Contractors recommends that a soil test be conducted. A rough planting surface improves water infiltration, and this may be achieved by scarifying the surface with a comb blade on the grader.
On sites where growth is required immediately it is recommended that the slope be watered to achieve a saturated profile before hydromulching. Additional watering regimes will be designed to meet evaporation and transpiration levels.
If maintenance work such as irrigation is necessary, it should be set up prior to the mulch being sprayed. The irrigation should be designed to apply the water evenly without eroding the mulch. Applying maintenance fertiliser to the site after six weeks will provide the best results.
Hydromulching ensures the soil surface is offered immediate protection whilst providing an ideal environment for vegetation growth. Hydromulching can be applied to sites up to 300 metres away from vehicle access