Published April 1963. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Crimson clover may be used as a cover crop, green manure, pasture, or hay. It often is used as a winter annual cover crop in annual rotations. It has been used successfully in reduced-tillage farming systems, and in orchards and vineyards where it can be managed to reseed itself.
These annual legumes are grown for seed and forage in western Oregon. They may respond to applications of fertilizers and lime. The fertilizer and liming needs can be estimated through the use of soil tests. Good management practices are essential if optimum fertilizer responses are to be realized. These practices...
Red clover (Trifolium pratense L.) seed yield can be affected by plant growth regulators (PGR) and irrigation; however, the effects of these factors on physiological maturity (PM), harvest maturity (HM), and seed quality are unknown. The objectives of this study were to: 1) determine how irrigation and trinexapac-ethyl (TE, a...
Published May 1978. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Subterranean clover was grown in nutrient solution and S
deficient Steiwer soil in the greenhouse. Plants were harvested at
15, 30, 45 and 60 days after emergence.
When subterranean clover was grown in nutrient solution significant
yield response to each increment of added sulfate (SO₄-S)
occurred in 15, 30, 45...
Published March 1944. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
An experiment was conducted to determine the best method to
establish subterranean clover on medusahead infested ranges in
Western Oregon. Secondary objectives of this study were to determind
the effects of management treatments on (a) subterranean
clover density, (b) density of medusahead and other vegetation, and
(c) yield of subterranean...
Published October 1945. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Published March 1981. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Published March 1942. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Previous research had identified four serogroups of Rhizobium trifolii
indigenous to Abiqua soil (fine, mixed, mesic, Cumulic Ultic Haploxerolls).
Nodulation of subterranean clover (Trifolium, subterraneum L.) by two of the
serogroups, 6 and 36, was influenced by the application of CaC0₃ to the soil.
The studies described in this thesis...
Legume plants with no nodules or with nodules containing ineffective bacteria are common causes of low production or complete failures of alfalfa and clover plantings in Oregon. These failures result in the loss of the stand plus the investment in fertilizer and seed used to make the planting. In many...
Small broomrape, a holoparasitic weed, is a relatively new weed introduction in the Pacific Northwest that has contaminated a limited number of red clover fields in Oregon. Greenhouse and field studies were conducted to evaluate small broomrape response to common crop and weed species in the Pacific Northwest. Host species...
Published January 1951. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Entomopathogenic fungi are cosmopolitan microbial pathogens that cause fungous diseases in a wide range of insects via spore infection. Due to their natural enemy status, they have tremendous potential for use as microbial control agents against insect pests, especially subterranean pests for which few management options are available. The clover...
Published September 1927. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Published August 1952. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Published March 1944. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Published May 1936. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Published November 1938. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Field studies designed to study residual effects from fertilizer
molybdenum were initiated in September 1971 on established grass-clover
pastures at ten sites in Western Oregon. Treatments were 0.0
and 1.12 kg molybdenum /ha on plots receiving 0-35-0-20S fertilizer (elemental sulfur-S) and 0.0, 0.56, 1.12 and 2.24 kg molybdenum /ha on...
Two separate investigations were carried out. The first experiment
on subterranean clover (Mr. Barker) was conducted in the field
and greenhouse on the Steiwer soil. The second experiment on alfalfa
(DuPuits) was conducted in the greenhouse on selected eastern Oregon
soils.
The purposes of the first experiment were to determine...
Published April 1985. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Several rates of P and S separately and together were applied to established grass-subclover pastures in six western Oregon counties. Soil and plant analyses were made in order to determine their value as a means of predicting whether or not P actually was needed and, if so, the amount or...
Published January 1982. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Red clover is an important seed and forage crop in western Oregon. Lime, phosphorus, potassium, sulfur, and boron will increase yields under some western Oregon soil conditions. The need for nutrients other than sulfur can be estimated using a soil test. Red clover is best adapted to well-drained soils. Good...
Four sampling techniques were evaluated to estimate clover aphid, Nearctaphis bakeri
(Cowen), abundance in red clover fields in the Willamette Valley. The Berlese funnel method
detected one to four times more aphids than other sampling techniques. Visual assessment
often underestimated the high aphid densities during the flowering and seeding of...
A seed maturation study was conducted to determine the earliest
date seed of subterranean clover (Trifolium subterraneum L.) may be
safely harvested without reduction in yield or seed quality. In 1981
and 1982, seed and bur weight, seed and bur moisture content, germination and seedling vigor were studied to determine...
Published June 1972. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Small broomrape (Orobanche minor) is a parasitic weed that attaches to the roots of red clover (Trifolium pratense). Small broomrape invasion presents a significant threat to the future of red clover seed production in Oregon. This study was conducted to investigate and develop small broomrape management options for red clover...
Small broomrape (Orobanche minor Sm.) is a parasitic weed that recently has become troublesome in red clover seed production in Oregon. It was identified
in a single red clover seed production field in 1998, and the number of infestations increased to 15 by 2000 and 22 by 2001.
During the Spring of 1969, 47 surface soil samples (0 to 15 cm)
as well as foliage samples of subterranean clover were collected from
32 selected western Oregon pastures, in an effort to determine their
molybdenum status and to evaluate the use of anion exchange resin
method as a means...
Subclovers are used for forage and hay and have been used successfully in Oregon as fall-planted and relay interplanted cover crops in annual rotations. They are capable of accumulating substantial amounts of N, a portion of which is available to the following crop. Rapid growth suppresses weeds in spring.
Published August 1963. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
In a series of greenhouse experiments, isolates representing serotypically
distinct subpopulations of Rhizobium leguminosarum bv. trifolii recovered from root
nodules of field-grown subclover Trifolium subterraneum cv. "Nangeela"), were
evaluated for their symbiotic effectiveness potential, their effect on regrowth
potential of subclover, and for their competitive abilities to form nodules. Isolates...
Perennial ryegrass (Lolium perenne) - white clover
(Trifolium repens) hill-land pastures were grazed at
different times in the winter to study the effect of time
of winter grazing on plant response and forage production.
The same pastures were grazed by sheep once in early
December, January, February, March, or April...
Published March 1944. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Both red (Trifolium pratense L.) and white (Trifolium repens L.) clover
seed yields can be highly variable and low in western Oregon. The objectives of
this study were to: i) determine crop water requirements and supplemental
irrigation timing, and ii) quantify the effects of soil and water status on
inflorescence...