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Sediment characteristics in storm runoff from an agricultural watershed

Creator:: Laird, David Alan
Resource Type:: Masters Thesis
Full Text:: 11411011111' 0 ha i285 ha 1.4 ha 14 1000 m Figure 3: Plan view of the Elkins Road Watershed. 23 and

The effects of gypsum on infiltration and surface properties of some western Oregon soils

Creator:: Pronold, Michael Joseph
Abstract:: The effects of broadcast gypsum on infiltration rates, crusting, aggregate stability, and runoff and sediment yields were analyzed during the winter months on three West Oregon soils. The results were used to evaluate its utility as a management tool to help control erosion. An application rate of two metric tons...
Resource Type:: Masters Thesis
Full Text:: for Privacy Dr. M. E. Harward The effects of broadcast gypsum on infiltration rates, crusting

Hydrological parameters affecting overland flow in an agricultural watershed

Creator:: Lowery, Birl
Abstract:: Surface and subsurface hydrological parameters affecting overland flow from cultivated land were studied in three small sub-watersheds located in the western foothills of the Willamette Valley. The sub-watersheds, which ranged in size from 0.46 to 6.0-ha, were fall-planted to grass or small grain. The parameters studied were infiltration, rainfall, runoff...
Resource Type:: Dissertation
Full Text:: during the preparation of this thesis. I wish to also thank Dr. M. E. Harward for his advice and

Agricultural erosion and sediment in the western Willamette Valley as indicated by redistribution of Cesium-137

Creator:: Brown, R. B. (Randall Barber)
Abstract:: Modern agricultural erosion was studied using ¹³⁷Cs from fallout as an indicator of erosion/deposition. The study area was a 285 ha agricultural watershed in the hilly western margin of the Willamette Valley, a high winter rainfall zone in which fall-planted crops are commonly grown. Objectives of the study were (i)...
Resource Type:: Dissertation
Full Text:: of Elkins Road Watershed, Oregon. Elevations are in meters. Dashed line is watershed boundary. 35 2

Diclofop in runoff from agricultural watersheds in a high winter rainfall zone

Creator:: Hickman, John Spencer
Abstract:: Diclofop-methyl [me yl 2-(4-(2,4-dichlorophenoxy) phenoxy) propanoate] hydrolysis, degradation, and leaching were studied in field and laboratory experiments. Greater than 75% of the applied diclofop-methyl hydrolyzed to diclofop in 2 days at 4°C, the prevailing soil temperature during western Oregon winters. Degradation beyond the diclofop molecule, also an active herbicide, was...
Resource Type:: Dissertation
Full Text:: Pronold for their help in collecting data as former members of the "Elkins Road erosion crew". Special

Surface complexation of protons and sulfate by kaolinite

Creator:: Wildensee, Frank
Abstract:: The emission of sulfur oxides from anthropogenic sources represents a potential threat to terrestrial ecosystems. Sulfate, the most highly oxidized form of sulfur, is the most common form of inorganic sulfur in most soil environments. The sorption of sulfate may influence the alkalinity of the soil solution and as a...
Resource Type:: Masters Thesis
Full Text:: sorption by two oxisols and an alfisol of the tropics. Soil Science 127:108-116. Elkins, D. M., and L. E

Sediment, phosphorus and nitrogen in storm runoff from some Willamette Valley croplands

Creator:: Simmons, F. William
Resource Type:: Masters Thesis
Full Text:: A. .Location of subwatersheds within the Elkins Road Watershed 119 B. LR soil map with soil

Composition and variability of a Willakenzie map unit in Yamhill County, Oregon

Creator:: Kastens, Marilyn K.
Abstract:: The variability in morphologic, chemical, and physical soil properties within the Willakenzie silty clay loam, 2 to 12 percent slopes, map unit in Yamhill County, Oregon was measured. The objectives of the study included (1) describing the frequency distributions of individual soil properties, (2) measuring the taxonomic composition of the...
Resource Type:: Masters Thesis
Full Text:: objectives (1) and (2). Samples were taken at 35 m intervals along transects placed within four delineations

Fertilizer nitrogen use efficiency by winter wheat in the Willamette Valley

Creator:: Kjelgren, Roger Keith
Abstract:: Efficiency of nitrogen fertilizer uptake by soft white winter wheat (Triticum aestivum L.) was measured over two cropping seasons across a range of soils and cropping histories in the Willamette Valley. Fate and potential losses of applied nitrogen were also assessed over a seventeen month period. In both cropping seasons,...
Resource Type:: Masters Thesis
Full Text:: erosion from two watersheds in the Willamette Valley; one each in south Polk county (Elkins Road) and

Soil solution chemistry, profile development, and mineral authigenesis in several western Oregon soils

Creator:: Glasmann, Joseph Reed
Abstract:: Clay mineral genesis was studied in soils representative of several different geomorphic surfaces in western Oregon, ranging in age from Pliocene-early Pleistocene to late Pleistocene. Soil solution studies, clay mineralogy, and soil raicromorphology were employed to provide evidence of clay mineral synthesis and interpret soil genesis. Soils at each study...
Resource Type:: Dissertation
Full Text:: Elkins Road Watershed (Lowrey et al., 1981). The subwatershed lies approximately 85 m above sea level

ScholarsArchive@OSU

Sediment characteristics in storm runoff from an agricultural watershed

The effects of gypsum on infiltration and surface properties of some western Oregon soils

Hydrological parameters affecting overland flow in an agricultural watershed

Agricultural erosion and sediment in the western Willamette Valley as indicated by redistribution of Cesium-137

Diclofop in runoff from agricultural watersheds in a high winter rainfall zone

Surface complexation of protons and sulfate by kaolinite

Sediment, phosphorus and nitrogen in storm runoff from some Willamette Valley croplands

Composition and variability of a Willakenzie map unit in Yamhill County, Oregon

Fertilizer nitrogen use efficiency by winter wheat in the Willamette Valley

Soil solution chemistry, profile development, and mineral authigenesis in several western Oregon soils

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