Reed canarygrass (Phalaris arundinacea L.) is a desirable pasture
grass on wet areas in the Northern United States and Southern Canada,
but it is a serious and troublesome ditchbank weed in the Pacific Northwest
and Rocky Mountain States. The purpose of this study was to learn
more about the development,...
There is evidence that recent ecological changes in lakes and their watersheds can be detected from analysis of lake sediments. This study was initiated to correlate
changes in some sediment characteristics of four Oregon lakes with past cultural developments of the lakes and their watersheds. The lakes chosen for this...
The distribution and abundance of the interstitial acoel turbellarian,
Diatomovora amoena Kozloff, 1965 was studied in an
estuarine intertidal sand flat in Yaquina Bay, Oregon, from May
1970 through May 1971.
Monthly measurements of biological (organics, sulfides, chlorophyll,
and carotenoids), pore water (salinity, pH,oxygen, and temperature),
and sediment (fine sediment...
Vegetation as a soil-forming factor was studied under forest
transition and grass while attempting to keep other soil forming factors
constant in the western part of the Willamette Valley, Oregon. The
physiographic units consist chiefly of the interior foothills and slopes
formed from an old basaltic flow with some interspersed...
This study was undertaken to obtain information on the quality of grass seed when windrowed at the high moisture levels necessary for obtaining maximum yields. A secondary goal was to monitor moisture and temperature fluctuations in the windrow and to relate their effects to development and deterioration of the seed....
Elasticity properties of wood studs are essential inputs for
the structural analysis of wood-stud wall systems.
A theoretical procedure was developed to determine the probability
distributions for the deflection-load relations of stud samples.
The procedure is based on the finite element analysis and a Monte-
Carlo type simulation and accounts...
The objectives of this study were to evaluate environmental
factors influencing use of several plant communities by cattle, elk
and deer; determine under story production by plant species and the
amount utilized by cattle, elk and deer in certain plant communities;
evaluate the interactions of range use between cattle, elk...
A population of the Douglas-fir cone moth, Barbara colfaxiana
(Kft. ), was studied on the Buckhead Seed Production Area, Oakridge,
Oregon, during 1971 and 1972. A method of estimating cone and
insect populations is presented. Factors contributing to the mortality
of B. colfaxiana are discussed, with resinosis being the critical...
The application of lime to an acid Nekia soil significantly
increased the yield of winter wheat and alfalfa in a field experiment.
Crop yields maximized when the lime was partially mixed into the surface
four inches of the soil. Thorough mixing of the lime into the
surface six inches of...
A study was conducted during 1974 and 1975 to evaluate the impact
of stocking intensity and season of grazing upon carbohydrate
concentration, biomass of storage organs, and total carbohydrate per
plant in the roots and crowns of perennial ryegrass (Lolium perenne L.)
in improved rangelands in Western Oregon. The stocking...
The wetlands are distinguished from other lands of the Mid-Willamette Valley by excessive soil moisture. The wetlands, as defined for this study, consist of 20 soil series (in 22 soil mapping units) which are classified by the Soil Conservation Service as having excessive wetness as the major factor limiting their...
Detailed bathymetric survey data were collected along the Peruvian
continental margin and were compiled by the author and other
investigators to construct a new bathymetric map for the area between
6° to 18°S latitude. Based on this map and individual bathymetric
profiles, the continental shelf topography is essentially flat. Four...