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Filtering by: Advisor William, Ray D. Remove constraint Advisor: William, Ray D. Degree Name Master of Science (M.S.) Remove constraint Degree Name: Master of Science (M.S.) Rights Statement Copyright Not Evaluated Remove constraint Rights Statement: Copyright Not Evaluated

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  • Crop and tree response to planting patterns in alley cropping systems

    Creator:
    Seiter, Stefan
    Abstract:
    Growing trees as a green manure crop together with an annual food crop is a new technology for farmers in Oregon. To promote farmer participation and to acquire a broad knowledge of the processes involved in species interactions, three feasible alley cropping and two sweet corn monocrop planting patterns were...
    Resource Type:
    Masters Thesis
    Full Text:
    would like to express special thanks to Dr. Ray William, who has become a friend and mentor. The two

  • Soil temperature suppression on growth and yield of potato (Solanum tuberosum L.) in warm climates of Sri Lanka

    Creator:
    Tharmarajah, S. K.
    Abstract:
    Potato (Solanum tuberosum L.) is one of the most productive and nutritious food crops. Due to its adaptability to cool climates, production in Sri Lanka has been restricted to erosion-prone highlands. Vast potential exists for expansion of potato cultivation in the lowlands while production areas in the highlands are limited...
    Resource Type:
    Masters Thesis
    Full Text:
    approved:. t Ray D. William Potato {Solanum tuberosum L.) is one of the most productive and nutritious

  • Cereal residue effects on weeds and cucumbers

    Creator:
    Peachey, Ronald Edward
    Abstract:
    Cereal residues suppress the development of small seeded, summer annual weeds. The focus of this study was to determine whether cereal residues can be used to suppress weeds in cucumber production systems in the Pacific Northwest. In the first of three experiments, cereal residues of fall-planted, spring-killed cover crops suppressed...
    Resource Type:
    Masters Thesis
    Full Text:
    Effects on Weeds and Cucumbers Abstract Approved: / Ray D. William Cereal residues suppress the

  • Multiple pest suppression with cover crops in strawberry

    Creator:
    Datta, Braja Bandhu
    Abstract:
    The experiment was conducted to compare multiple pest (weed, soil arthropod and diseases) suppression by cereal cover crops in 'Selva' and 'Totem' strawberry. In addition, perlite was used to compare improvement of soil and root aeration which might modify strawberry black root rot complex. Small-seeded summer annual weeds were suppressed...
    Resource Type:
    Masters Thesis
    Full Text:
    with Cover Crops in Strawberry. Abstract approved: Ray D William The experiment was conducted

  • Managing growth and competition of a perennial ryegrass (Lolium perenne L.) living mulch in a vegetable cropping system

    Creator:
    Wiles, Lori Jeannine
    Abstract:
    Vegetable production with a living mulch may reduce soil erosion and compaction, increase organic matter levels, and decrease the requirement for chemical inputs. Competition between the vegetable and mulch, however, has limited the development of successful living mulch systems to realize these benefits. In a field study, interference between pak...
    Resource Type:
    Masters Thesis

  • Studies of the radiance of metal grinding sparks

    Creator:
    Kelley, John E.
    Abstract:
    A method for measuring the spark-shower radiance of metals when abraded on an abrasive grinding wheel was developed for evaluating their sparking tendency. One hundred metals were tested and rated relative to commercially pure iron. The radiance was measured in units of energy per solid angle per area of the...
    Resource Type:
    Masters Thesis
    Full Text:
    the helpful advice of Dr. William D. McMullen, Dr. Roger D. 011eman, and Professor Olaf G. Paasche

  • Genotype x environment interactions in sheep

    Creator:
    Corum, Kathleen Steele
    Abstract:
    The 865 ewe production records taken from three lamb crops, were analyzed to study breed effects, heterosis, environmental effects and interactions between them, and breed and heterosis x environment interaction effects on ewe production traits. In each of two environments, approximately 144 ewes were mated in a three breed reciprocal...
    Resource Type:
    Masters Thesis
    Full Text:
    INTERACTIONS IN SHEEP Abstract approved: Redacted for privacy (Signature) William D. Hohenboken The 865 ewe

  • The effect of typical production variables on the strength of high purity commercial tantalum sheet

    Creator:
    Findley, Lee Gordon
    Abstract:
    The erratic behavior of the room temperature yield strength of high purity commercial tantalum sheet was studied. Critical factors in the production process were postulated and then investigated to determine their effects on strength properties. Chemical composition was found to be the most important factor contributing to the strength; thermomechanical...
    Resource Type:
    Masters Thesis
    Full Text:
    TANTALUM SHEET Abstract approved: Redacted for Privacy Dr. William D. McMullen The erratic behavior of

  • Genetic and environmental differences in age at first estrus and in wool and lamb production of crossbred ewe lambs

    Creator:
    Cedillo, Rose Mary
    Abstract:
    Genetic and environmental factors affecting age of first estrus, wool production, reproduction and lamb production were examined in eight groups of crossbred ewe lambs from two birth years. The 399 ewe lambs whose first year production was analyzed were from eight crossbred groups resulting from mating North Country Cheviot, Dorset,...
    Resource Type:
    Masters Thesis
    Full Text:
    EWE LAMBS Abstract approved: Redacted for privacy W. D. Hohenboken Genetic and environmental

  • Biological and economic effects of flushing and creep feeding in sheep

    Creator:
    Taiwo, Bolaji
    Abstract:
    One hundred two mature blackface crossbred ewes were randomly divided into three equal groups to examine the effects of feeding management during mating on blood chemistry, weight change and subsequent reproductive performance. Group I was kept in drylot from 17 days before through 17 days after the start of mating....
    Resource Type:
    Masters Thesis
    Full Text:
    Privacy W. D. Hohenboken One hundred two mature blackface crossbred ewes were randomly divided into