A greater than 10-fold increase in Canada goose (Branta canadensis) populations over the past several years has resulted in concerns over grazing impacts on grass seed production in the mid-Willamette Valley, Oregon. This study was designed to develop methods to quantify and statistically analyze goose-grazing impacts on seed yields of...
In this study I assessed the potentials of selected, established perennial grasses to maintain site occupancy in the foothills ecosystem of the Rogue River Valley of southwest Oregon which is currently dominated by a variety of annual plants. The first evaluation compared growth curves of the perennial grasses and contrasted...
As part of investigations to adapt a suitable grazing system in
western Oregon, this research was designed to monitor the effects of
defoliation treatments on dry matter production, forage quality,
regrowth after defoliation, and species composition of a Lolium
perenne Trifolium subterraneum pasture for three consecutive
growing seasons from 1980...
This research assessed certain specific plant-soil and community
interrelationships in eastern Oregon habitat types dominated by
subspecies of Artemisia tridentata.
The first evaluation described plant-induced soil chemical patterns for Artemisia tridentata plant communities of high perennial
grass-low shrub and low perennial grass-high shrub composition. Soil
concentrations of total nitrogen, organic...
Four studies were conducted. First, mountain big sagebrush communities were burned at Lava Beds National Monument, California, and The Crooked River National Grassland, Oregon. In two years at Lava Beds, basal cover of Idaho fescue in one community and Thur- ber's needlegrass in one of three communities did not recover....
The objectives of this study were to evaluate the effects of site
potential, season and plant part on percent crude protein, percent
digestibility of dry matter and yield of cereal residues. Three cereal
types, club wheat (Triticum aestivum) tall, bearded wheat (T.
aestivum), and barley Hordeum vulgare) were examined.
Stress...
A study was conducted over a two year period, 1973 through
1974, on perennial ryegrass-subclover pastures with stocking rates
of 7.4 (moderate), 9. 9 (heavy), and 12.4 (overstocked) ewes per
hectare to establish guidelines on stocking intensity for dryland
improved pastures in western Oregon. Climatic conditions varied
annually and caused...