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  • Plant growth regulators and shattering control in cool-season perennial grasses

    Creator:
    Lee, Suk-Kyun
    Abstract:
    Shattering is a natural phenomenon of floret and spikelet disarticulation across abscission layers of the pedicel and rachilla, respectively, after seed maturation. Seed shattering in cool-season grasses and native grass species is an economic problem in seed production. This study was conducted to determine whether the use of the plant...
    Resource Type:
    Masters Thesis

  • Residue management and yield characteristics of fine fescue seed crops

    Creator:
    Schumacher, Derek David
    Abstract:
    Chewings fescue [Festuca rubra L. subsp. fallax (Thuill.) Nyman] is a desired turfgrass with dense sod forming capabilities and superior shade tolerance. Thermal residue management (open-field burning) has traditionally been used to remove post-harvest residue and maintain seed yield over the life of the stand. However, alternative non-thermal residue management...
    Resource Type:
    Masters Thesis
    Full Text:
    . To Drs. William C. Young, III, Erik K. Fritzell, and Neil W. Christensen, I express my appreciation

  • Performance of perennial ryegrass (Lolium perenne L.) seed crops under water stress conditions

    Creator:
    Velloza, Theodosius Marmaduke
    Abstract:
    Summer drought is a major factor limiting the regrowth of perennial ryegrass seed crops. This phase of crop development has a strong influence on seed yield because most of the tillers that contribute towards next season's seed crop are produced or regrown during this period. In recent years many seed...
    Resource Type:
    Dissertation
    Full Text:
    manuscript. Special thanks to my committee members, Drs. William C. Young HI, Jeffrey J. Steiner, Daryl G

  • Food systems in the Marys River region and reinhabitation

    Creator:
    Burke, Erik P.
    Abstract:
    Reinhabitation is an approach to building local cultures and economies within industrial society. The food system is a vital starting point. What are the principles of reinhabitory food systems? What are the possibilities for a locally adapted food system in the Marys River region of western Oregon? I describe past...
    Resource Type:
    Masters Thesis
    Full Text:
    needed to hear until it sank in. I am deeply grateful for his help. Dr. John Young made thoughtful

  • An observational study of the wind fields associated with GATE cloud clusters

    Creator:
    Tollerud, Edward I.
    Abstract:
    The wind and thermodynamic fields associated with eastern Atlantic cloud clusters are studied using radiosonde data from the Global Atmospheric Research Program Atlantic Tropical Experiment (GATE). These data are from the gridded set of winds prepared by Dr. Katsuyuki Ooyama (AOML-NOAA) and Dr. Jan-Hwa Chu (SSEC, University of Wisconsin, Madison)...
    Resource Type:
    Dissertation
    Full Text:
    of my doctoral committee (Dr. James Deardorff, Dr. Young-June Han, Dr. Victor Madsen, Dr. William

  • Evaluation of perennial ryegrass straw as a forage source for ruminants

    Creator:
    Fisher, Michael J.
    Abstract:
    We conducted two experiments evaluating perennial ryegrass straw as a forage source for ruminants. Experiment 1 evaluated digestion and physiological variables in steers offered perennial ryegrass straw containing increasing levels of lolitrem B. Sixteen ruminally cannulated Angus X Hereford steers (231 ± 2 kg BW) were blocked by weight and...
    Resource Type:
    Masters Thesis
    Full Text:
    trial were very appreciated.) Dr. William Young, III has contributed more to my program than I think he

  • Methods to assess factors that influence grass seed yield

    Creator:
    Louhaichi, Mounir
    Abstract:
    A greater than 10-fold increase in Canada goose (Branta canadensis) populations over the past several years has resulted in concerns over grazing impacts on grass seed production in the mid-Willamette Valley, Oregon. This study was designed to develop methods to quantify and statistically analyze goose-grazing impacts on seed yields of...
    Resource Type:
    Dissertation
    Full Text:
    extended to my graduate committee, which included Dr. William Young (Department of Crop and Soil Science

  • Spring irrigation management of perennial ryegrass (Lolium perenne L.) seed production

    Creator:
    King, Craig Millhouser
    Abstract:
    Introduction of later maturing cultivars of perennial ryegrass (Lolium perenne L.) places more seed production fields in a period of drought common to Oregon during vital stages of reproductive development. During these stages, the final yield of the crop is largely determined by the number of seeds set, and the...
    Resource Type:
    Masters Thesis
    Full Text:
    my committee members, Drs. Marshal English, Jack Stang, and William Young III. To all of my friends

  • Effects of mineral nutrition on development of crown gall caused by Agrobacterium tumefaciens

    Creator:
    Hussin, Hamid Mohammed
    Resource Type:
    Dissertation
    Full Text:
    to the members of the Program Committee: Drs. R. A. Young, E. Hansen and J. C. R. Li, for their

  • Water relations in red and white clover seed crops

    Creator:
    Oliva, Ruben N.
    Abstract:
    Both red (Trifolium pratense L.) and white (Trifolium repens L.) clover seed yields can be highly variable and low in western Oregon. The objectives of this study were to: i) determine crop water requirements and supplemental irrigation timing, and ii) quantify the effects of soil and water status on inflorescence...
    Resource Type:
    Dissertation
    Full Text:
    indebted to my graduate committee, Drs. Thomas E. Bedell, Don F. Grabe, Patrick Hayes, and William Young