As part of a participatory research project, where farmers and Oregon State University researchers collaborated, aspects of potato (Solanum tuberosum L.) growing systems were studied. It was determined through conversations with the farmers that quantification of certain growth parameters of potato was lacking, including dry matter accumulation, crop nitrogen (N)...
Potatoes require adequate nitrogen to produce quality tubers and high yields. Organic farming practices are designed to build soil nutrient levels
gradually. In organic systems, nitrogen (N) enters the soil in the form of crop residue and amendments (e.g., manures, composts, and specialty products).
Much of the N added to...
Mimicry, obscure colors, and secondary sexual colors were
important classes of observations that were analyzed by nineteenth
century biologists from several vantage points. Adherents of the
doctrine of special creation of fixed species believed animal colors
to be evidence of design; Darwin and Wallace and their successors
suggested that a...
Potentially relevant literature for the years 1990-1999 was identified by (a) conducting keyword searches of computerized bibliographic databases, especially CAB Abstracts and Aquatic Sciences and Fisheries Abstracts, (b) reading through the tables of contents of a few especially relevant journals, (c) searching the internet for pertinent bibliographies, and (d) to...
This study was concerned with identifying the program activities
and resources believed necessary to support a districtwide, comprehensive
school health instruction program and investigated the perceptions
of an expert committee composed of persons involved in
school health instruction in the State of Washington.
A questionnaire, developed after extensive review of...
Because studies of forestry effects on wetlands have been so infrequent in the Pacific Northwest, each section in this report drew heavily from studies of forestry impacts to streams and riparian zones. After assembly and synthesis, that information was extrapolated, mostly in the form of hypotheses, to the very different...
Interest in measuring soil quality continues to increase worldwide in view of demands on land productivity and the necessity to preserve soil resources, yet identification of suitable indicators for soil quality assessment is still evolving. This study adapted 10 biological, physical, and chemical indicators of soil quality identified by the...
A sediment production and infiltration study was conducted
within the Oregon Range Validation Project Work
Area in east-central Oregon during the summers of 1977 and
1978. High intensity rainfall was simulated by using a
Rocky Mountain Infiltrometer. This sprinkler-type infiltrometer
closely approximates conditions associated
with natural rainfall.
The basic ecological...
This study is composed of two parts. Section I deals with
developed moorages and marinas--where they are; what services are
offered in each, and how well the existing supply of permanent moorages
serves the boating public. Section II examines the need for temporary
'harbors of refuge' in the area, what...
The structure of engineering curricula currently in place at most colleges and universities has existed since the early 1950's, and reflects an historical emphasis on a solid foundation in math, science, and engineering science. However, there is often not a close match between elements of the traditional engineering education, and...
Full Text:
Abstract approved:
AN ABSTRACT OF THE DISSERTATION OF
John E