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  • 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

  • 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

  • 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

  • The development and analysis of future agricultural landscapes

    Creator:
    Berger, Patricia A.
    Abstract:
    Alternative futures studies provide a way for policy-makers and stakeholders to investigate the future impacts of different management strategies by providing representations of possible outcomes. An alternative futures study was undertaken by the Pacific Northwest-Ecosystem Research Consortium for the Willamette River Basin, Oregon, USA, to determine how this regional system...
    Resource Type:
    Dissertation
    Full Text:
    ........................................................ 21 2.5 The results of the 5x2 paired F-test by crop for each pairing of the four algorithms

  • Estimated plant water use and crop coefficients for drip-irrigated hybrid polars

    Creator:
    Gochis, David J.
    Abstract:
    Estimations of plant water use can provide great assistance to growers, irrigators, engineers and water resource planners. This is especially true concerning the introduction of a new crop into irrigated agriculture. Growing hybrid poplar trees for wood chip stock and veneer production under agronomic practices is currently being explored as...
    Resource Type:
    Masters Thesis
    Full Text:
    presented on January 23, 1998 APPROVED: Major Professor, representing Bioresource Engineering He f