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• 31. [Article] Irrigation water and plant density effects on the epidemiology of aerial stem rot of potatoes

  Field plots of cv. Russet Burbank potatoes from a single seedlot were established at four sites over two seasons (1985-86) in two locations in Oregon to determine the role of water-borne inoculum of Erwinia ...

  Citation × Citation Citation Abstract Copy Title: Irrigation water and plant density effects on the epidemiology of aerial stem rot of potatoes Author: Cappaert, Marlys R. Field plots of cv. Russet Burbank potatoes from a single seedlot were established at four sites over two seasons (1985-86) in two locations in Oregon to determine the role of water-borne inoculum of Erwinia carotovora in plant infection. One site at each location was irrigated from a surface-water source and the other from a well-water source. Prior to planting, seed tubers and field soil were assayed for presence of Erwinia spp.. Populations of soft rot erwinias in water and on leaf surfaces, and the incidence of aerial stem rot were determined bimonthly from plant emergence until two weeks prior to regional harvest. Strains recovered from all sources were characterized biochemically, and Erwinia carotovora subsp. carotovora strains were typed serologically by Ouchterlony agar double diffusion. Populations of soft rot erwinias were consistently higher in surface water compared to well water. Populations ranged from 0 to 524 and 0 to 25 cfu/ml in surface-water sources in 1985 and 1986, respectively. Detection of soft rot erwinias in well water usually required enrichment. Populations of soft rot erwinias on potato foliage were highest in midseason after row closure. Populations in plots irrigated with surface-water and well-water were similar and ranged from 0 to 5.90 log cfu/g and from 0 to 6.22 log cfu/g fresh weight in 1985 and 1986, respectively. Final proportion of stems with aerial stem rot was consistently higher in well-water irrigated sites ranging from a low of 0.09 in the surface-water irrigated site in 1985 to a high of 0.51 in the well-water irrigated site in 1986. Over 90% of strains recovered from all sources were characterized as E. c. subsp. carotovora. About 25% of the E. c. subsp. carotovora strains recovered from all sources were identified serologically. At all but two sites over two years some of the strains recovered from water sources were the same serologically as epiphytic strains and strains recovered from diseased stems. A majority of stains isolated from diseased stems differed serologically from water serogroups at all locations. Field plots of potato cv. Russet Burbank were established at four sites in two years to determine the effect of plant density and plant spacing on development of aerial stem rot. Plant densities were 13, 26, and 52 x 10³ plants per hectare. The intermediate density had two treatments with different within-row and between-row spacing arrangements. Treatment effects were measured by onset of disease symptoms, final proportion of disease and area under the disease progress curve (AUDPC). In 1986, leaf area index was measured and throughout both seasons leaf wetness was monitored with a CR21X Campbell Scientific micrologger. Onset of aerial stem rot symptoms occurred earlier and final proportion of disease and AUDPC were greater in dense compared to sparse plantings. Larger differences in onset of disease and AUDPC occurred with a decrease in between-row spacings than in a decrease in within-row spacings. A linear regression model that used area under the leaf area index curve (AULAIC) for the four plant spacings as the independent variables accounted for 89-98% of the variation in AUDPC. Highest leaf area index values and longest average duration of leaf wetness preceded highest level of disease by two weeks. Title: Irrigation water and plant density effects on the epidemiology of aerial stem rot of potatoes Author: Cappaert, Marlys R. Field plots of cv. Russet Burbank potatoes from a single seedlot were established at four sites over two seasons (1985-86) in two locations in Oregon to determine the role of water-borne inoculum of Erwinia carotovora in plant infection. One site at each location was irrigated from a surface-water source and the other from a well-water source. Prior to planting, seed tubers and field soil were assayed for presence of Erwinia spp.. Populations of soft rot erwinias in water and on leaf surfaces, and the incidence of aerial stem rot were determined bimonthly from plant emergence until two weeks prior to regional harvest. Strains recovered from all sources were characterized biochemically, and Erwinia carotovora subsp. carotovora strains were typed serologically by Ouchterlony agar double diffusion. Populations of soft rot erwinias were consistently higher in surface water compared to well water. Populations ranged from 0 to 524 and 0 to 25 cfu/ml in surface-water sources in 1985 and 1986, respectively. Detection of soft rot erwinias in well water usually required enrichment. Populations of soft rot erwinias on potato foliage were highest in midseason after row closure. Populations in plots irrigated with surface-water and well-water were similar and ranged from 0 to 5.90 log cfu/g and from 0 to 6.22 log cfu/g fresh weight in 1985 and 1986, respectively. Final proportion of stems with aerial stem rot was consistently higher in well-water irrigated sites ranging from a low of 0.09 in the surface-water irrigated site in 1985 to a high of 0.51 in the well-water irrigated site in 1986. Over 90% of strains recovered from all sources were characterized as E. c. subsp. carotovora. About 25% of the E. c. subsp. carotovora strains recovered from all sources were identified serologically. At all but two sites over two years some of the strains recovered from water sources were the same serologically as epiphytic strains and strains recovered from diseased stems. A majority of stains isolated from diseased stems differed serologically from water serogroups at all locations. Field plots of potato cv. Russet Burbank were established at four sites in two years to determine the effect of plant density and plant spacing on development of aerial stem rot. Plant densities were 13, 26, and 52 x 10³ plants per hectare. The intermediate density had two treatments with different within-row and between-row spacing arrangements. Treatment effects were measured by onset of disease symptoms, final proportion of disease and area under the disease progress curve (AUDPC). In 1986, leaf area index was measured and throughout both seasons leaf wetness was monitored with a CR21X Campbell Scientific micrologger. Onset of aerial stem rot symptoms occurred earlier and final proportion of disease and AUDPC were greater in dense compared to sparse plantings. Larger differences in onset of disease and AUDPC occurred with a decrease in between-row spacings than in a decrease in within-row spacings. A linear regression model that used area under the leaf area index curve (AULAIC) for the four plant spacings as the independent variables accounted for 89-98% of the variation in AUDPC. Highest leaf area index values and longest average duration of leaf wetness preceded highest level of disease by two weeks. Close

• 32. [Article] Numerical computation of free surface water flow

  The present thesis is a report of investigations on a model for computing the water flow in the wave tank of the OSU Wave Laboratory. A wave board, established at one end of the 100 m long, 4 m wide and ...

  Citation × Citation Citation Abstract Copy Title: Numerical computation of free surface water flow Author: Kuhnert, Jorg The present thesis is a report of investigations on a model for computing the water flow in the wave tank of the OSU Wave Laboratory. A wave board, established at one end of the 100 m long, 4 m wide and 6 m deep wave tank, produces water waves by periodically moving back and forth. The resulting free surface water flow will be modeled physically. This physical model will be transformed into a mathematical model which is implemented on a computer. The goal is to approximately compute the velocity distribution of the fluid modeled as a linear combination of basis functions. Certain well known mathematical tools such as the Galerkin method or the idea of finite elements are employed. The theoretical developments are done for the three-dimensional case. However, numerical experiments are performed in two dimensions only. Two different types of basis functions will be introduced and investigated. Their advantages, disadvantages and capability to compute realistic results will clearly be shown and demonstrated in practice. Several problems occured during the development of the computation algorithms. These problems are outlined in this thesis, and several solutions are suggested. For example, a method how to deal with rising and falling water surface at a vertical boundary will be presented. The results of five numerical test runs will be exhibited, underlining what the theory predicts. Title: Numerical computation of free surface water flow Author: Kuhnert, Jorg The present thesis is a report of investigations on a model for computing the water flow in the wave tank of the OSU Wave Laboratory. A wave board, established at one end of the 100 m long, 4 m wide and 6 m deep wave tank, produces water waves by periodically moving back and forth. The resulting free surface water flow will be modeled physically. This physical model will be transformed into a mathematical model which is implemented on a computer. The goal is to approximately compute the velocity distribution of the fluid modeled as a linear combination of basis functions. Certain well known mathematical tools such as the Galerkin method or the idea of finite elements are employed. The theoretical developments are done for the three-dimensional case. However, numerical experiments are performed in two dimensions only. Two different types of basis functions will be introduced and investigated. Their advantages, disadvantages and capability to compute realistic results will clearly be shown and demonstrated in practice. Several problems occured during the development of the computation algorithms. These problems are outlined in this thesis, and several solutions are suggested. For example, a method how to deal with rising and falling water surface at a vertical boundary will be presented. The results of five numerical test runs will be exhibited, underlining what the theory predicts. Close

• 33. [Article] Irrigation Decisions for Major West Coast Crops: Water Scarcity and Climatic Determinants

  Access to this item has been restricted by repository administrators at the request of the publisher, Oxford University Press, until June 15, 2017.

  Citation × Citation Citation Abstract Copy Title: Irrigation Decisions for Major West Coast Crops: Water Scarcity and Climatic Determinants Author: Olen, Beau, Wu, JunJie, Langpap, Christian Access to this item has been restricted by repository administrators at the request of the publisher, Oxford University Press, until June 15, 2017. Title: Irrigation Decisions for Major West Coast Crops: Water Scarcity and Climatic Determinants Author: Olen, Beau, Wu, JunJie, Langpap, Christian Access to this item has been restricted by repository administrators at the request of the publisher, Oxford University Press, until June 15, 2017. Close

• 34. [Article] Surface water variation and water storage potential in Upper Klamath Basin, 2000-2012

  Citation × Citation Citation Abstract Copy Title: Surface water variation and water storage potential in Upper Klamath Basin, 2000-2012 Author: Tanner, Andrew M. Title: Surface water variation and water storage potential in Upper Klamath Basin, 2000-2012 Author: Tanner, Andrew M. Close

• 35. [Article] Flume testing of underwater seep detection using temperature sensing on or just below the surface of sand or gravel sediments

  This is the publisher’s final pdf. The published article is copyrighted by the American Geophysical Union and can be found at: http://onlinelibrary.wiley.com/journal/10.1002/%28ISSN%291944-7973.

  Citation × Citation Citation Abstract Copy Title: Flume testing of underwater seep detection using temperature sensing on or just below the surface of sand or gravel sediments Author: Selker, J. S., Selker, F. This is the publisher’s final pdf. The published article is copyrighted by the American Geophysical Union and can be found at: http://onlinelibrary.wiley.com/journal/10.1002/%28ISSN%291944-7973. Title: Flume testing of underwater seep detection using temperature sensing on or just below the surface of sand or gravel sediments Author: Selker, J. S., Selker, F. This is the publisher’s final pdf. The published article is copyrighted by the American Geophysical Union and can be found at: http://onlinelibrary.wiley.com/journal/10.1002/%28ISSN%291944-7973. Close

• 36. [Article] Effectiveness of Extracting Water Surface Slopes from LiDAR Data within the Active Channel: Sandy River, Oregon, USA

  x, 108 p. : ill. (some col.) A print copy of this title is available through the UO Libraries. Search the library catalog for the location and call number.

  Citation × Citation Citation Abstract Copy Title: Effectiveness of Extracting Water Surface Slopes from LiDAR Data within the Active Channel: Sandy River, Oregon, USA Author: English, John Thomas, 1980- Year: 2009 x, 108 p. : ill. (some col.) A print copy of this title is available through the UO Libraries. Search the library catalog for the location and call number. Title: Effectiveness of Extracting Water Surface Slopes from LiDAR Data within the Active Channel: Sandy River, Oregon, USA Author: English, John Thomas, 1980- Year: 2009 x, 108 p. : ill. (some col.) A print copy of this title is available through the UO Libraries. Search the library catalog for the location and call number. Close

• 37. [Article] Iron, nutrient, and phytoplankton distributions in Oregon coastal waters

  Copyrighted by American Geophysical Union.

  Citation × Citation Citation Abstract Copy Title: Iron, nutrient, and phytoplankton distributions in Oregon coastal waters Author: Wheeler, Patricia A., Chase, Zanna, Marra, John, van Geen, Alexander, Kosro, P. Michael, 1951- Copyrighted by American Geophysical Union. Title: Iron, nutrient, and phytoplankton distributions in Oregon coastal waters Author: Wheeler, Patricia A., Chase, Zanna, Marra, John, van Geen, Alexander, Kosro, P. Michael, 1951- Copyrighted by American Geophysical Union. Close

• 38. [Article] Modeling surface water and groundwater interactions near Milton- Freewater, Oregon

  The gravel aquifer of the Oregon side of Walla Walla River Basin has a strong hydrologic connection to surface water through a series of springs, unlined irrigation canals, the Walla Walla River, numerous ...

  Citation × Citation Citation Abstract Copy Title: Modeling surface water and groundwater interactions near Milton- Freewater, Oregon Author: Petrides Jimenez, Aristides Crisostomos The gravel aquifer of the Oregon side of Walla Walla River Basin has a strong hydrologic connection to surface water through a series of springs, unlined irrigation canals, the Walla Walla River, numerous wells and, since 2004, artificial recharge to the shallow aquifer using infiltration basins. The finite element Integrated Water Flow Model (IWFM) developed by California Department of Water Resources was used to quantify all of the major hydrologic features of the basin. Using the information provided by the Walla Walla Basin Watershed Council, irrigation districts, and previous studies conducted at Oregon State University and by consultants, the model was setup and calibrated, and a water budget simulation was performed for the years of 2003 to 2006. It is shown that close to 96 percent of the land use water demand goes to agriculture growing 16 major crops. 60 percent of the water comes from surface water diversions flowing through unlined irrigation canals , which themselves lose 28 percent of their inflow to the unconfined gravel aquifer. The calibrated and validated model was used to simulate the flow of the Johnson Creek Springs, which were shown to have increased flow due to the artificial recharge project. Title: Modeling surface water and groundwater interactions near Milton- Freewater, Oregon Author: Petrides Jimenez, Aristides Crisostomos The gravel aquifer of the Oregon side of Walla Walla River Basin has a strong hydrologic connection to surface water through a series of springs, unlined irrigation canals, the Walla Walla River, numerous wells and, since 2004, artificial recharge to the shallow aquifer using infiltration basins. The finite element Integrated Water Flow Model (IWFM) developed by California Department of Water Resources was used to quantify all of the major hydrologic features of the basin. Using the information provided by the Walla Walla Basin Watershed Council, irrigation districts, and previous studies conducted at Oregon State University and by consultants, the model was setup and calibrated, and a water budget simulation was performed for the years of 2003 to 2006. It is shown that close to 96 percent of the land use water demand goes to agriculture growing 16 major crops. 60 percent of the water comes from surface water diversions flowing through unlined irrigation canals , which themselves lose 28 percent of their inflow to the unconfined gravel aquifer. The calibrated and validated model was used to simulate the flow of the Johnson Creek Springs, which were shown to have increased flow due to the artificial recharge project. Close

• 39. [Article] Surface Water Interaction with “Confined” Columbia River Basalt Aquifers – Impacts to Streams from Declining Groundwater Levels near Mosier, Oregon

  Presented at The Oregon Water Conference, May 24-25, 2011, Corvallis, OR.

  Citation × Citation Citation Abstract Copy Title: Surface Water Interaction with “Confined” Columbia River Basalt Aquifers – Impacts to Streams from Declining Groundwater Levels near Mosier, Oregon Author: Lite Jr., Kenneth E. Year: 2011 Presented at The Oregon Water Conference, May 24-25, 2011, Corvallis, OR. Title: Surface Water Interaction with “Confined” Columbia River Basalt Aquifers – Impacts to Streams from Declining Groundwater Levels near Mosier, Oregon Author: Lite Jr., Kenneth E. Year: 2011 Presented at The Oregon Water Conference, May 24-25, 2011, Corvallis, OR. Close

• 40. [Article] Satellite-based prediction of pCO₂ in coastal waters of the eastern North Pacific

  This is the publisher’s final pdf. The published article is copyrighted by Elsevier and can be found at: http://www.journals.elsevier.com/progress-in-oceanography/. To the best of our knowledge, one or ...

  Citation × Citation Citation Abstract Copy Title: Satellite-based prediction of pCO₂ in coastal waters of the eastern North Pacific Author: Takahashi, Taro, Feely, Richard, Hales, Burke, Letelier, Ricardo, Sabine, Christopher, Strutton, Peter G., Chavez, Francisco, Saraceno, Martin This is the publisher’s final pdf. The published article is copyrighted by Elsevier and can be found at: http://www.journals.elsevier.com/progress-in-oceanography/. To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. Title: Satellite-based prediction of pCO₂ in coastal waters of the eastern North Pacific Author: Takahashi, Taro, Feely, Richard, Hales, Burke, Letelier, Ricardo, Sabine, Christopher, Strutton, Peter G., Chavez, Francisco, Saraceno, Martin This is the publisher’s final pdf. The published article is copyrighted by Elsevier and can be found at: http://www.journals.elsevier.com/progress-in-oceanography/. To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. Close