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Characteristics of compacted soils from Eastern Oregon

Creator:: Goh, Hock Swee
Abstract:: Soil samples and soil clods were collected from ten potato fields in Eastern Oregon. An index of grain size distribution was sought that would correlate well with compacted soil bulk density. The Hazen coefficient of uniformity was best related to bulk density. The limitations of various indices and their relationship...
Resource Type:: Masters Thesis
Full Text:: The author is very grateful for the help, encouragement and advice given by Dr. Benno P. Warkentin

Soil factors related to potassium deficiency of stone fruits in the Willamette Valley

Creator:: Selig, Randy S.
Resource Type:: Masters Thesis
Full Text:: "..--0 Dr. B. P. Warkentin Potassium deficiency is a persistent problem in hillside stone fruit

Surface erosion on a clearcut in the Willamette National Forest

Creator:: George, Danella
Resource Type:: Masters Thesis
Full Text:: . Benno Warkentin for having faith that I would complete my thesis; to my family for watching CD spring

Effects of clay-water interactions on water retention in porous media

Creator:: Lenhard, Robert J. (Robert James)
Abstract:: Capillary pressure-saturation data obtained for unconsolidated porous media with different liquids are examined to investigate the effects of clay-liquid interactions on liquid retention. Liquid retention functions are assumed to reflect the effective pore-size distributions. The hydraulic variables, capillary pressure and saturation, are transformed to account for changes in liquid retention...
Resource Type:: Dissertation
Full Text:: , and Benno Warkentin for their professional assistance and their valued friendship during my tenure at

Calibration of crop water use with the Penman equation under United Arab Emirates conditions

Creator:: Mohammed, Fareed H. A. N.
Abstract:: Water shortage is one of the biggest problems facing agricultural development in the United Arab Emirates, because of the extremely arid climate and the large amount of irrigation water that is used for crops. Prediction of crop water requirements is essential to solve water management problems in this country. Two...
Resource Type:: Masters Thesis
Full Text:: professor Dr. Benno P. Warkentin, I would like to express my gratitude to him for the guidance, assistance

Stability of soil structure for water movement in an aridisol

Creator:: Ali, Safdar
Abstract:: Lack of stability of soil aggregates for water movement is a major problem in arid soils due to low organic matter and higher sodium contents. Soil amendments for improving stability of structure and increasing infiltration of water are essential to solve water management problems in these areas. Different rates of...
Resource Type:: Masters Thesis
Full Text:: . Abstract approved: Redacted for privacy Benno P. Warkentin Lack of stability of soil aggregates for water

A soil property model for evaluating pesticide movement potential

Creator:: Vogue, Margaret A.
Abstract:: Prevention of groundwater contamination by agricultural chemicals requires an understanding of the complex processes that control pesticide movement below the soil surface. Through this understanding it is possible to try to predict which areas may be most vulnerable to contamination. The many models that have been developed to characterize pesticide...
Resource Type:: Masters Thesis
Full Text:: Potential Abstract approved:Redacted for Privacy genno Warkentin Prevention of groundwater contamination

A comparative analysis of stream response to disturbance in the Pacific Northwest

Creator:: Hodgins-Carlson, Terry Anne
Abstract:: Published literature about six Pacific Northwest stream systems was contrasted to provide a regional perspective on channel response to disturbance. This investigation was prompted by a combination of recent environmental legislation, mounting social pressures to plan projects at a drainage basin scale, and the difficulty in defining and predicting the...
Resource Type:: Masters Thesis
Full Text:: support and effort afforded to me from my graduate committee, Benno Warkentin, Gordon Grant, and Herb

Geostatistical applications to salinity mapping and simulated reclamation

Creator:: Al-Taher, Mohamad A.
Abstract:: Geostatistical methods were used to find efficient and accurate means for salinity assessment using regionalized random variables and limited sampling. The random variables selected, sodium absorption ratio (SAR), electrical conductivity (EC), and clay content were measured on samples taken over an area of fifteen square miles. Ordinary kriging and co-kriging...
Resource Type:: Dissertation
Full Text:: Mapping and Simulated Reclamation Redacted for Privacy Abstract Approved: . P. Warkentin Geostatistical

Water and solute transport : modeling and application to water conservation in layered soil

Creator:: Mohammed, Fareed H. A. N.
Abstract:: Sandy soils are among the least productive soils because of their inability to store adequate water for plant growth. Their high percolation rate not only allows water to move quickly beyond the root zone, but also washes nutrients below the reach of plant roots. High evaporation occurs from the soil...
Resource Type:: Dissertation
Full Text:: Abstract approved: Benno P. Warkentin Sandy soils are among the least productive soils because of their

ScholarsArchive@OSU

Characteristics of compacted soils from Eastern Oregon

Soil factors related to potassium deficiency of stone fruits in the Willamette Valley

Surface erosion on a clearcut in the Willamette National Forest

Effects of clay-water interactions on water retention in porous media

Calibration of crop water use with the Penman equation under United Arab Emirates conditions

Stability of soil structure for water movement in an aridisol

A soil property model for evaluating pesticide movement potential

A comparative analysis of stream response to disturbance in the Pacific Northwest

Geostatistical applications to salinity mapping and simulated reclamation

Water and solute transport : modeling and application to water conservation in layered soil

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