Index Catalog // ScholarsArchive@OSU

Cover crop effect on soil microbial biomass after fumigation in potato fields in the Columbia Basin

Creator:: Kim, Esther
Abstract:: In the Columbia Basin, pre-plant soil fumigation is commonly used in potato production for pest control, but fumigation can kill non-target organisms within the soil, result in unintended shifts in the microbial community, and disrupt long-term soil health. Cover crops have been shown to strongly influence the numbers and communities...
Resource Type:: Masters Thesis
Full Text:: committee Dr. Markus Kleber, Dr. Ed Peachey, and Dr. Sagar Sathuvalli. Additionally, thank you Dr. Shahram

Investigating the Potential of Slow Release Nitrogen Fertilizer to Increase Agricultural Nitrogen Management Efficiency for Tall Fescue in the Southern Willamette Valley

Creator:: Derksen, Jacob Z.
Abstract:: Nitrogen (N) fertilizer application can promote nitrate leaching below the rooting zone and into groundwater drinking water sources in many agricultural settings. The proper management of N application can minimize non-point source nitrate pollution to groundwater. This study examines the potential for enhanced efficiency fertilizers, specifically urea treated with a...
Resource Type:: Masters Thesis
Full Text:: and principal investigator, Jana Compton and the rest of his committee Ed Peachey, William Jaeger

Chemical Control of Suckers in Hazelnuts (Corylus avellana): Comparing Herbicide Efficacy, Spray Nozzle, and Carrier Volume

Creator:: Larocca de Souza, Larissa
Abstract:: Hazelnuts (Corylus avellana) produce a prolific growth in the base of the trunk and roots, known as suckers, which are often removed in order to promote the development of a single trunk tree. Sucker removal facilitates cultural practices and mechanized operations, such as weed management and harvest. Sucker presence can...
Resource Type:: Masters Thesis
Full Text:: . Pscheidt, Dr. Ronald Edward Peachey, and Dr. Valtcho Jeliazkov. During my period in Dr. Moretti's

Soil Water Tension Irrigation Criteria Affects Both Stevia Rebaudiana Leaf Yield and Leaf Steviol Glycoside Composition

Creator:: Parris, Cheryl A.
Abstract:: Stevia (Stevia rebaudiana) is a perennial herbaceous plant native to Paraguay and used traditionally by the native Guarani peoples for centuries to sweeten medicinal teas. Stevia has only been commercially cultivated over the past 50 years and cultural practice information suitable for implementation by growers is limited. Currently stevia’s commercial...
Resource Type:: Masters Thesis
Full Text:: steviol glycosides were not reported. In south-western Belavatagi, India (15o 34’ N, 75o 21’ E, 578

Physiological effects of non-nutritive sugars on the survivorship and fecundity of Drosophila suzukii (Diptera: Drosophilidae)

Creator:: Tang, Siew Bee
Abstract:: Spotted wing drosophila (SWD), Drosophila suzukii, is an economically damaging pest on small fruits. The estimated economic impact is hundreds of millions of dollars annually in the U.S. alone, and increasing every year. Current control of SWD relies heavily on chemical insecticides which have many negative impacts on environmental and...
Resource Type:: Masters Thesis
Full Text:: would also like to thank Drs. Jana Lee, Vaughn Walton and Ronald Wrolstad for being in my committee. I

Thresholds of uncertainty : radiation and responsibility in the fallout controversy

Creator:: Jolly, J. Christopher
Abstract:: The public controversy over possible health hazards from radioactive fallout from atomic bomb testing began in 1954, shortly after a thermonuclear test by the United States spread fallout world wide. In the dissertation, I address two of the fundamental questions of the fallout controversy: Was there a threshold of radiation...
Resource Type:: Dissertation
Full Text:: , and Ronald E. Doel. All of them played significant roles in my development as an historian. Paul

Antioxidant potential of yeast containing beer

Creator:: Morris, Edward E.
Abstract:: It has been suggested that cellular damage from oxygen radicals is one of the processes leading to cardio-vascular disease and cancer. Natural antioxidants prevent uncontrolled oxidative reactions by decreasing molecular oxygen levels, scavenging chain-initiating and chain-propagating free radicals, chelating metals, or decomposing peroxides. Beer is rich in antioxidants, derived both...
Resource Type:: Masters Thesis
Full Text:: AN ABSTRACT OF THE THESIS OF Edward E. Morris for the degree of

Interrelationships among changes in flavor and aroma, and composition of stored strawberry juice concentrate

Creator:: Lundahl, David S.
Abstract:: Sensory evaluation and instrumental methods were applied to the evaluation of strawberry juice concentrate (68°Brix) stored at 20°C which had been produced both commercially (C-SJC) and in a pilot plant (SJC). Sensory evaluation included taste and aroma ratings by intensity scaling and time-intensity of taste, and visual colorimetry by matching...
Resource Type:: Dissertation
Full Text:: . Mina McDaniel contributed to this text by serving as my major advisor. Dr. Ronald Wrolstad was a key

Purification of strawberry polyphenol oxidase and its role in anthocyanin degradation

Creator:: Wesche-Ebeling, Pedro Alfredo E.
Abstract:: Polyphenol oxidase (PPO) from strawberries was purified, partially characterized, and used to study its role in the degradation of anthocyanin pigments. The extraction method included the use of a buffered solution containing the phenolic binders Polyclar AT and Amberlite XAD-4. Addition of Triton X-100 resulted in an increase of the...
Resource Type:: Dissertation
Full Text:: concerning this research, and to Dr. Ronald E. Wrolstad and Dr. Daryl G. Richardson for their help and for

Perceptual characteristics of selected acidulants by different sensory and multivariate methods

Creator:: Rubico, Sonia Mendoza
Abstract:: The taste qualities of acidulants have not been studied in detail despite the fact that they are widely used by the food industry. Studies on characterizing the sensory properties of organic and inorganic acids are very limited. Reported studies are commonly on threshold, equi-sour and the time intensity values of...
Resource Type:: Dissertation
Full Text:: 81 b. Procedure 83 c. Data Analysis 83 d. Equi-Sour Determination 84 e. Chemical

ScholarsArchive@OSU

Cover crop effect on soil microbial biomass after fumigation in potato fields in the Columbia Basin

Investigating the Potential of Slow Release Nitrogen Fertilizer to Increase Agricultural Nitrogen Management Efficiency for Tall Fescue in the Southern Willamette Valley

Chemical Control of Suckers in Hazelnuts (Corylus avellana): Comparing Herbicide Efficacy, Spray Nozzle, and Carrier Volume

Soil Water Tension Irrigation Criteria Affects Both Stevia Rebaudiana Leaf Yield and Leaf Steviol Glycoside Composition

Physiological effects of non-nutritive sugars on the survivorship and fecundity of Drosophila suzukii (Diptera: Drosophilidae)

Thresholds of uncertainty : radiation and responsibility in the fallout controversy

Antioxidant potential of yeast containing beer

Interrelationships among changes in flavor and aroma, and composition of stored strawberry juice concentrate

Purification of strawberry polyphenol oxidase and its role in anthocyanin degradation

Perceptual characteristics of selected acidulants by different sensory and multivariate methods

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