Studies were conducted to establish some characters which
could be used, either in the field or in the laboratory, to differentiate
between annual ryegrass (Oregon), Lolium multiflorum Lam. , and
Linn perennial ryegrass, Lolium perenne L.
Vernation, percentage of glumes covering the spikelets, and
height of seedlings seem to be...
The purposes of this study were to determine the effects of
temperature, nutrients, growth regulators, and culm detachment
during seed development on ryegrass seed dormancy and weight.
The effects of storage temperature on seed dormancy were also
Seed dormancy of annual (Lolium multiflorum Lam.) and
perennial (Lolium perenne L.)...
The influence of grazing closing dates and form and amount of
nitrogen fertilizer on Gulf annual and Oregon annual ryegrass was
studied at locations in the Willamette Valley of Oregon.
Closing dates were established as mid-April, and May 1 together
with ungrazed plots for comparison. Fertility consisted of a single...
A series of in vitro laboratory trials and in vivo
sheep digestion trials were used to evaluate aerobically
or anaerobically fermented perennial ryegrass straw.
The laboratory trials consisted of a silage study, where
mini-silos were used in a 9 X 2 factorial design with
nine levels of whey (0 to...
Spring grazing of annual ryegrass (Lolium multiflorum L.) seed
fields with sheep is a common practice in the Willamette Valley of
Oregon. However, the effect of grazing on seed yield in Oregon has
not previously been investigated. This experiment was designed to
determine the effects of duration of spring grazing...
The number of varieties of ryegrass (Lolium spp.) has increased greatly in recent years. An accurate and rapid laboratory technique to identify these varieties would benefit the consumer as well as protect an organization's Plant Variety Protection rights. There is also a need for a technique to complement the seedling...
Seed yield in ryegrass (Lolium spp.) is the
product of the number of fertile tillers per unit area
and seed weight per spike at maturity. These
components of yield develop through a series of growth
stages beginning with tiller bud initiation and
finishing with seed filling. Environmental conditions
Introduction of later maturing cultivars of perennial ryegrass (Lolium perenne
L.) places more seed production fields in a period of drought common to Oregon
during vital stages of reproductive development. During these stages, the final yield of
the crop is largely determined by the number of seeds set, and the...
Studies were conducted to determine the variability existing in
repeated fluorescence tests of annual and perennial ryegrass
(Lolium multiflorum and L. perenne, respectively). Sources of
variation considered were within-sample error, among-sample
error, among-germinator error, and among-laboratory error.
These were studied independently and the variation in each was compared