Index Catalog // ScholarsArchive@OSU

Nitrate and pesticide transport under pear production in clay and sandy soil

Creator:: Cao, Weidong
Abstract:: Groundwater contamination on irrigated land is of concern in this nation and around the world. In order to reduce the potential of groundwater contamination by agricultural practices such as irrigation, fertilizer and pesticide application, vadose-zone monitoring and sampling are needed. The main objective of this study was to evaluate impacts...
Resource Type:: Masters Thesis
Full Text:: Production in Clay and Sandy Soil Abstract Approved: n S. Selker, Assistant Professor Groundwater

Transport of water and solutes from tile-drained fields in the Willamette Valley, Oregon : A field scale study

Creator:: Warren, Kristina
Abstract:: Tile drainage increases aeration in the root zone of poorly drained soils by accelerating water movement from the subsurface. Water movement is the main agent of chemical transport, either transporting soluble materials directly (e.g., nitrate) or by transporting the soil particles that bind adsorptive compounds (e.g., pesticides). The detection frequency...
Resource Type:: Masters Thesis

Improving soil water determination in spatially variable field using fiber optic technology and Bayesian decision theory

Creator:: Sayde, Chadi
Abstract:: Achieving and maintaining sustainability in irrigated agriculture production in the era of rapidly increasing stress on our natural resources require, among other essential actions, optimum control and management of the applied water. Thus, a significant upgrade of the currently available soil water monitoring technologies is needed. The primary goal of...
Resource Type:: Dissertation
Full Text:: Marshall J. English John S. Selker Achieving and

A predictive model for time domain reflectometry soil water content and salinity measurements

Creator:: Flugstad, Benjamin A.
Abstract:: Soil water content and water potential are two important parameters in determining the status of water in the soil. Improvement in the ability to measure these parameters by way of increased speed, accuracy, resolution, imaging volume, ease of automation, as well as reduced calibration requirements and reduced soil disturbance would...
Resource Type:: Masters Thesis
Full Text:: 3.4.5 Reflection Effects 46 3.5 Wave Propagation In Composite Media 51 3.6 Scattering (S) Parameter

Peppermint irrigation and nitrogen management for the reduction of nitrate loading to groundwater

Creator:: Smesrud, Jason K.
Abstract:: The agricultural production of peppermint has been shown to contribute significant quantities of nitrate-nitrogen to groundwater recharge. In an effort to provide new tools for increasing nitrogen efficiency within peppermint production, three research questions were proposed: i) How should plant tissue samples be collected to achieve the greatest precision when...
Resource Type:: Masters Thesis
Full Text:: : John S. Selker The agricultural production of peppermint has been shown to contribute significant

Assessment of variability and monitoring methods for leaching under cover crop management

Creator:: Hess, Mario
Abstract:: The contamination of ground water resources represents a serious problem and a prominent threat to the health of our society. This study focuses on the leaching of inorganic anions as a function of agricultural practices under natural field conditions. In order to enhance the understanding of such leaching processes, this...
Resource Type:: Masters Thesis
Full Text:: leben kann. Acknowledgments First of all, I want to thank Dr. John S. Selker, my advisor, for his

Evaluation of techniques for on-farm monitoring of percolation and irrigation system performance

Creator:: Louie, Michael J.
Abstract:: Efficient use of water in agricultural production involves accurate assessment and control of the quantity and spatial uniformity of excess percolation. Passive Capillary Samplers (PCAPS), which sample water from the vadose zone have shown potential to provide superior estimates of soil water flux compared to alternative methods. In a four-year...
Resource Type:: Masters Thesis
Full Text:: approved: John S. Selker Abstract approved: Jonathan D. Istok Efficient use of water in agricultural

Field evaluation of passive capillary samplers in monitoring the leaching of agrochemicals

Creator:: Brandi-Dohrn, Florian M.
Abstract:: Soil solution samplers have certain inadequacies that limit their range of possible applications. Passive Capillary Samplers (PCAPS), which apply suction to the soil pore-water via a fiber glass wick, have shown promising results in preliminary experiments in regard to collection efficiency of water and of bromide tracers. The objectives of...
Resource Type:: Masters Thesis
Full Text:: : Redacted for Privacy John S. Selker Soil solution samplers have certain inadequacies that limit their

Water content and electrical conductivity profile measurements for dispersive media using enhanced time domain and frequency domain models

Creator:: Flugstad, Benjamin A.
Abstract:: Water conservation and water quality are rapidly increasing in importance in all areas of the world. The ability to accurately measure soil water content and salinity, over a wide variety of conditions, is key to meeting this need. A set of forward prediction models and waveform interpretation algorithms to extract...
Resource Type:: Dissertation
Full Text:: Abstract approved: _____________________________________________________________________ John S. Selker

Hyperspectral Disease Detection - Strategies Addressing Time, Space, Machine Learning, and Plant Susceptibility

Creator:: Haagsma, Marja
Abstract:: Finding trees and crops that are resistant to pathogens is key in preparing for current and future disease threats. In this dissertation, we analyzed the potential of using hyperspectral imaging (HSI) to find infection while identifying issues and strategies addressing differences over time, in spatial resolution, the application of machine...
Resource Type:: Dissertation
Full Text:: : ______________________________________________________ John S. Selker Finding trees and crops that are

ScholarsArchive@OSU

Nitrate and pesticide transport under pear production in clay and sandy soil

Transport of water and solutes from tile-drained fields in the Willamette Valley, Oregon : A field scale study

Improving soil water determination in spatially variable field using fiber optic technology and Bayesian decision theory

A predictive model for time domain reflectometry soil water content and salinity measurements

Peppermint irrigation and nitrogen management for the reduction of nitrate loading to groundwater

Assessment of variability and monitoring methods for leaching under cover crop management

Evaluation of techniques for on-farm monitoring of percolation and irrigation system performance

Field evaluation of passive capillary samplers in monitoring the leaching of agrochemicals

Water content and electrical conductivity profile measurements for dispersive media using enhanced time domain and frequency domain models

Hyperspectral Disease Detection - Strategies Addressing Time, Space, Machine Learning, and Plant Susceptibility

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