Field and laboratory tests were carried out to investigate the
survival of the root-nodule bacterium, Rhizobium trifolii, when
inoculated onto seeds of the pasture legume subterranean clover,
(Trifolium subterraneum L.), in order to improve the nodulation
and establishment of this plant in acid soils.
Field experiments were carried out in...
A field study was conducted in the Willamette Valley near
Corvallis, Oregon, to determine the influence of seedling rate,
drill row spacing, grass association, and variety on the yield
of dry matter and quality (crude protein content and leafiness)
of alfalfa. Treatments included seeding rates of 7.5, 10, 15 and...
A field experiment was conducted to study the influence of cutting
treatments on the yield and quality of non-irrigated alfalfa in
western Oregon.
Spring clipping treatments included (1) not clipped, (2) clipped
when 6 inches high and (3) clipped when 12 inches high. The hay harvest
criteria were (1) near...
Field, greenhouse, growth chamber and laboratory experiments
evaluated factors affecting establishment, survival and production
of birdsfoot trefoil (Lotus corniculatus L.) and alfalfa (Medicago
sativa L.)
Field studies investigated the effects of a barley companion
crop, seedling year harvest management and nitrogen and phosphorus
fertilization upon stands, survival and subsequent production...
The winter and summer growth of varieties of tall fescue
(Festuca arundinacea Schreb.) that had originated from the Mediterranean region (Oregon 1000 and Tunisia) and northern Europe (Alta)
were studied outdoors in the Mediterranean climate of western Oregon,
and in greenhouses and controlled environment chambers. Treatments
of temperature, photoperiod and...
Field studies to determine appropriate cutting management
regimes consistent with yield, quality, and persistence
of stand were conducted on several alfalfa varieties in the
Columbia Basin region of Oregon.
Two groups of treatments, including consecutive cuts at
the same stage of maturity and cuts made at varying maturities,
were imposed...
A field experiment under irrigation was conducted at the
Hyslop Agronomy Farm, near Corvallis, Oregon, during the 1967
growing season to evaluate the effect of barley row spacing, nitrogen
rate and placement, and weed competition in the year of seeding upon
birdsfoot trefoil (Lotus corniculatus L.) seedling establishment.
The effect...
The influence of variety, plant population, and planting date on
corn silage production was studied at Hyslop Agronomy Farm,
Corvallis, Oregon. The corn plants were grown under irrigation with
300 pounds per acre of 16-20-0 (N-P₂0₅-K₂0) and 240 pounds of urea,
providing a total nitrogen application of 158 pounds per...
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 field study was conducted in 1978 and 1979 at two locations near
Corvallis, Oregon, to determine the silage yield and quality of 13 fallsown
cereal varieties at two nitrogen fertilizer levels in the context of
a corn-winter cemal double cropping production system.
Data on the yield, crude protein (CP)...
The problem of estimating the parameters of a forced discrete
linear dynamic model is considered. The system model is conceptualized
to include the value of the initial state as a parameter. The forces
driving the system are partitioned into accessible and inaccessible
inputs. Accessible inputs are those that are measured;...
Gene transfer via interspecific hybridization within Phaseolus has
been limited by abnormal hybrid development and the rapid loss of
hybridity in subsequent generations. The most advanced embryo
development occurs in P. vulgaris x P. coccineus where mature seeds
form. However, the reciprocal cross still results in abnormal embryos
unable to...
An enzyme catalyzing the formation of
O-glucosylzeatin in immature embryos of P. lunatus was
purified 2500 fold using ammonium sulfate precipitation
followed by affinity and anion exchange chromatography.
The enzyme uses trans-zeatin as substrate (Km 28 uM) but
not cis-zeatin. ribosylzeatin, or dihydrozeatin. Both
UDP-glucose and UDP-xylose can serve as...
A critical balance of hormones is necessary for normal plant
development. Therefore, precise mechanisms must exist to maintain
proper levels of cytokinins, a group of hormones regulating cell
division and differentiation. Structural modifications of the naturally
occurring cytokinin, zeatin; including the oxidation, O-glycosylation
and reduction of the N⁶-side chain; may...
Cytokinins are a group of plant hormones mediating cell division and
differentiation. Zeatin is a naturally occurring and highly active cytokinin that is rapidly
metabolized in Phaseolus seeds. The metabolites and enzymes mediating the conversion
have been studied extensively. Zeatin metabolic enzymes may be utilized in studying the
regulation of...
Interspecific hybridization between Phaseolus vulgaris and P.
coccineus results in the formation of either mature F₁ seeds or abnormal
embryos, depending on the direction of the cross. However, normal as
well as abnormal embryos occur in the reciprocal F₂ populations. The
exact cause of abnormal embryo development is unknown. To...
