From 1979 through 1984 the economic bases of rural
Oregon counties have undergone structural change. Nonwage
income, especially transfer payments, has played an
important role in these changes. Demographic changes in
rural counties have contributed to the growth in unearned
income.
The economic structure of rural Oregon counties was
estimated...
Contingent valuation has been used to elicit values
for changes in the quantity and quality of nonmarket
amenities. Yet hypothetically trading dollars for
environmental improvements is not a familiar activity for
most survey respondents. A variety of response effects
associated with survey collected data can potentially lead
to biased contingent...
1. Six major types of commercial gear have been used to take salmon and steelhead on the Columbia River; namely, gill nets, set nets, seines, traps, fish wheels and dip nets. 2. The five important commercial species in the Columbia River are chinook, silver, blueback and chum salmon and steelhead...
A study consisting of three parts was undertaken to investigate how variation in species interactions, population genetic structure, epidemiological parameters, and plant breeding system may influence the ecology and biological control of an apomictic invasive plant, Chondrilla juncea (Asteraceae). Interactions between natural enemy species may modify their net effect on...
Oregon State College Serial Publications 1938-1950 supplements a list of similar title covering the years 1868-1938 compiled by Constance E. Lehde and Hendrine Rozendal. With the exception of two series, monographs and research papers, it includes only publications issued from July 1938 through December 1950. The few titles issued in...
Thermal oxidation of methyl oleate was studied over a range of temperatures from 50 C to 150 C for periods of time up to 30 min. Degradation was quantitatively followed by gas liquid chromatography (GLC) and liquid scintillation counting of the products of methyl oleate-U-14C heated under a stream of...
Nitrogen can be lost when the quantity of available nitrogen exceeds crop demand or nitrogen availability is not in synchrony with crop demand. Either situation results in accumulation of available nitrogen, primarily in the nitrate form, at the end of the growing season. Over-winter nitrogen loss occurs primarily as nitrate-...