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hydro seeding
If anyone is interested, I have a EasyLawn 600 gal. hydroseeder for sale. It is two and a half years old, but with very low hours, and is mounted on a factory built trailer. My Email is harburn@dnet.net if you want to contact me.
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hydro seeding
You are essentially correct with a few minor points. There are two kinds of hydroseeding machines - paddle agitation and jet agitation. The paddle units can break up solid bales easier and will tolerate high percentages of wood fiber with little trouble. They tend to be more expensive as they are steel construction and can have expensive maintenance requirements as they age. Jet agitation units require a larger percentage of paper vs. wood fiber and you need to be more careful about breaking up the bales. Larger units typically have bale grinders (900 gal. and larger) so they load bales rapidly. A new mulch, called Jet Spray, is a pourable mulch and loads as fast as you can dump the bags in. Also, EasyLawn jet agitated units will mix a geobinder, Airtrol Gypsum, with no problems. I don't know if other jet units tolerate the gypsum but EasyLawn has a proprietary pump design that seems to be superior.
The hydro mulch serves several purposes. Large trucks that spray big areas tend to use it as a coloring agent so they can do an even application. They will then blow straw or hay over the seeded areas. This mainly serves to cool the soil so fescues, which are cool weather grasses, will germinate in hot weather and also provides some frost protection in the early spring. Often the straw/hay will blow or wash away if it is not sprayed with a light slurry of hydro mulch (no seed) and a tacking agent to bind it together. If the hydromulch is not followed with straw/hay, it is applied at the recommended rate per acre. Fibers and tackifiers are also added, at times, to better stick the mulch/seed mixture to the soil. EasyLawn sells soluble lime and fertilizer which is immediately available to the new grass. The water used in the mix is not sufficient for germination. Any hydroseeded areas must receive rainfall/watering adequate for germination. Also, new grass must also get enough water to keep it from dying. This is up to the customer. Often, annual rye or brown millet is used (at a specific rate per tank) as a nurse crop. Several mowings will make the nurse crop disappear after it has served its purpose. This is a basic overview of hydroseeding and each geographic area has its specific requirements as to the best grasses to seed with.
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