In addition to its longstanding recognition as an influential evolutionary process,
interspecific hybridization is increasingly regarded as a potential threat to the genetic integrity and survival of rare plant species, manifested through gamete wasting, increased pest and disease pressures, outbreeding depression, competitive exclusion, and genetic assimilation. Alternatively, hybridization has also...
Published February 1946. 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 January 1956. 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
The functioning of marine habitats needs to be understood in the context of the ecological relationships and associations between organisms and the physical and biogenic environment they inhabit. Thus, it becomes important to explore and define habitat features which contribute to these relationships and which are important in the life...
Spotted knapweed, Centaurea maculosa Lam. (Compositae) is an extremely
successful introduced weed species in the northwestern United States. Multiple factors
may be responsible for its success, including chemical defense. Two different types of
putative chemical defense agents are the focus of this thesis. The first is a bitter-tasting
Three rates of urea, urea-DCD, and NH₄N0₃ were soil
applied in April and August 1986 to strawberry selection
OR-US 4930 and cultivar 'Sumas' to determine effects of the
nitrification inhibitor dicyandiamide (DCD) and nitrogen
source and rate on soil NH₄ and N0₃ levels, fruit yield and
quality, and mineral composition...
Despite the increase in information on the causes of foodborne disease, outbreaks continue to be a major preventable public health problem. Current food service establishment inspection programs, however, are not designed to assess the potential of risk for foodborne disease and do not focus prevention efforts where food service problems...
Investing in farmland is one of the most important decisions that
farmers face in their lifetimes. Usually, large amounts of debt are
required to purchase a substantial tract of land, thereby reducing the
farmer's liquidity position and future borrowing capacity. Fixed debt
commitments must be met by highly variable future...