Growth chamber and field experiments were conducted to investigate
the effects of different temperature levels and durations on
floral induction and vegetative growth in orchardgrass. Propagules
of two clones, XLI-8 (clone R) and MID-5 (clone 0), from the synthetic
variety Pennlate, were used in all experiments.
Clone R plants were...
Samples of Russet Burbank and Kennebec seed potatoes
used by Oregon growers were grown in replicated plots at
Klamath Falls, Prineville and Corvallis. Observations
were made of total yield, yield of U.S. No. 1 tubers and
number of stems produced per plot.
Total yields of the Russet Burbank variety were...
Field and growth chamber studies were conducted to ascertain
the effects of some environmental factors on the persistence of viable
buried seed of Agrostis tenuis, Avena fatua, Lolium multiflorum,
Lolium perenne, and Poa annua.
Through the use of a population model, specific effects of environment
on parameters of viability and...
Experiments were conducted under controlled environments to
investigate the influence of nutrient supply and panicle removal on
tiller and panicle production in orchardgrass. Propagules of two
clones, MID-5 (Clone 0), from the synthetic variety Pennlate, and
Clone B, a locally adapted clone, were utilized for these studies.
Tiller production was...
Controlled environment chamber and laboratory studies were
carried out to evaluate selectivity and chemodynamics of bromoxynil
(3,5-dibromo-4-hydroxybenzonitrile) in winter wheat (Triticum
aestivum L.) 'Nugaines', a tolerant species, and coast fiddleneck
(Amsinckia intermedia Fisch. & Mey), a susceptible species.
A comparison of ED₅₀ values, based upon reduction of whole
plant growth,...
Experiments were conducted to determine the effect of environment
and several plant growth regulators on the physiology, quality,
and agronomic performance of snap beans (Phaseolus vulgaris L. )
and spring wheat (Triticum aestivum L. ). The potassium salts of
naphthenic acid and cyclohexanecarboxylic acid, received particular
attention.
Application of potassium...
The effects of post-harvest burning of red fescue on production of shoots, roots and inflorescences as well as seed yield were determined at the clonal and community level by comparing fescue plants in a burned area with those in unburned plots within the same field. Studies were also conducted to...
Experiments were conducted to determine the effects of
certain plant regulatory chemicals on seed production of
alfalfa (Medicago sativa L.). Two plant regulators, SADH
(succinic acid 2,2-dimethylhydrazide) and TIBA (2,3,5-
triiodobenzoic acid), received particular attention.
Replicated field tests of the plant regulators were
carried out on the cultivar 'Talent' in...
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...
Gas exchange, leaf area development, leaf anatomy and stomatal characteristics of four tall fescue selections differing in forage yield were examined to provide further insight into characteristics associated with yield differences of these selections. Winter-growing TFM 26 and TFM 16, the highest and lowest-yielding selections, respectively, and summer-growing selections TFK...
Kentucky bluegrass (Poa pratensis L.) cultivars are known to differ quantitatively in their photothermal floral inductive requirements. The extent to which these requirements are met influences the potential for subsequent panicle exsertion. A better understanding of the inductive requirements as they vary among cultivars would aid in the selection and...
This study was undertaken to better understand plant characteristics
related to high and low forage yield in tall fescue selections
as affected by temperature. Dry matter distribution into yield components
in three different temperature regimes was evaluated. Root
growth, dark respiration and nutrient concentration were also examined.
The four diverse...
Field study with 5 tall fescue genotypes treated at the vegetative
growth stage, with 0, 0.28, 0.56, and 0.84 kg/ha of mefluidide
was initiated in July, 1980. The regrowth of these plants were again
treated at the booting growth stage in April, 1981, with the same
rates of mefluidide as...
To increase efficiency of seed production, it is important to
understand the effects of nitrogen (N) fertilizer rate and time of
application. In particular, the effects on floret fertility should
be examined since only a small proportion of florets actually produce harvestable seed. For these reasons, experiments were conducted in...
Increases in wheat production due to breeding may be reaching
a plateau. The application of N-fertilizer beyond optimum levels
leads to lodging and to an increase in tiller death. The use of
plant growth regulators (retardants) may be an answer for future
increases in production.
Experiments were conducted in 1983...
Studies were conducted on the causes of low germination of
monogerm sugarbeet seed grown in western Oregon. Emphasis was
placed on the identification and measurement of endogenous inhibitors
as related to the germination and vigor. Both qualitative and quantitative
analytical methods were applied to examine the organic substances
in the...
Seed of Cougar and Newport Kentucky bluegrass (Poa pratensis L.)
was harvested at Pullman and Spokane at several stages of maturity.
Variations in seed attributes resulting from environmental and maturity
effects were evaluated through germination tests, tetrazolium staining,
seed moisture and seed weight determinations. Seedling vigor was
determined by .speed...