Sod-seeding techniques offer graziers a convenient way to introduce superior
grass cultivars into underproductive permanent pastures. Production loss and erosion are
minimized. In conjunction with improved grazing management and fertilization,
renovation can significantly improve yield and quality of pastures. Existent vegetation
must be suppressed prior to introducing new cultivars.
This study was conducted on two non-irrigated pastures near Corvallis, Oregon,
one dominated by annual grass species and the other by perennial grasses and clover. A
split-plot design with four replications on each site was used to compare three seeding
methods and either (a) two herbicides following close mowing or (b) close mowing
alone. The seeding methods were drilling with an Aerway Seedmatic chisel-type drill,
drilling with a Tye double disc drill, or broadcasting seed followed by harrowing.
Glyphosate and paraquat were the herbicides used for vegetation suppression. Effect of
fertilization was compared to no fertilization.
Sod-seeded perennial ryegrass had minimal establishment at the site dominated by
annual grass species. An inadequate amount of time was allowed for germination of
annual grass seeds before herbicides were applied. Annual grass seedlings suppressed
the newly sod-seeded perennial ryegrass.
Sod-seeded perennial ryegrass was successfully established at the site dominated
by perennial species within one year after planting. Broadcasting followed by harrowing
of seed resulted in a higher percentage of perennial ryegrass than either the Seedmatic
chisel drill or Tye double disc drill. Sod-seeded perennial ryegrass did not contribute
significantly to yield until one year after planting. Glyphosate gave better control of the
species present before planting leading to a higher percentage of perennial ryegrass and
improved yield compared to paraquat or close mowing alone when seed was broadcast
and harrowed. Fertilization of unseeded plots increased yield but was not cost-effective. / Graduation date: 1994
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/36302 |
| Date | 10 March 1994 |
| Creators | Neumeister, John H. |
| Contributors | Burrill, Larry |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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