Environmental Engineering Reference
In-Depth Information
Fig. 4.7. A hand spreader for seeding small areas.
shaker, allows for a uniform application of seeds. White sand guides the
applicator very efficiently by revealing which spots received more seeds
and which received less.
Areas that are difficult to reach, such as steep hillsides or roadsides,
are sometimes hydroseeded. Hydroseeding is a specialized type of grass
establishment in which seeds, paper pulp and fertilizer mixed with water
are sprayed onto the soil surface from a distance by special equipment
(Fig. 4.8). The paper pulp sticks to the soil, prevents seed run-off, retains
moisture for days without rain, and lasts until the grass is well estab-
lished. Almost any type of area can be hydroseeded, but the cost is
substantial.
Pre-germination
Pre-germination is used where a very rapid establishment is desired or to
reduce weed pressure. Some seeds such as those of zoysia grass and
centipede grass germinate slowly, and the resulting lengthy interval
between seeding and germination increases the opportunity for invasion
by weeds. In the pre-germination process, seeds are soaked in water,
usually for 5-10 days. When the first seeds show signs of germination,
the water-soaked seeds are mixed with dry sand and spread over the
desired area.
