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Filtering by: Creator Smith, L. O. Remove constraint Creator: Smith, L. O. Committee Member Chilcote, William W. Remove constraint Committee Member: Chilcote, William W. Decade 1960-1969 Remove constraint Decade: 1960-1969

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  • The response of tomatoes to atrazine as affected by magnesium and photoperiod

    Creator:
    Brenchley, Ronald Glenn
    Abstract:
    Studies were conducted to determine the nature of the interaction between atrazine (2-chloro-4-ethylamino-6-isopropylaminos- triazine) and magnesium on tomatoes. This interaction was studied under two light regimes: continuous light and a 12-hour photoperiod. Tomato plants were grown in sand cultures at three levels of magnesium fertilization. Four weeks after planting, atrazine...
    Resource Type:
    Dissertation
    Full Text:
    , 4-dichloropheny1)-1-methoxy-l-methyl- urea), and bromacil (5-bromo-3-sec-butyl -6-methyluracil

  • Genetic and stability relationships of four Western Cascade soils

    Creator:
    Paeth, Robert Carl, 1925-
    Abstract:
    A sequence of soils derived from tuffaceous rocks was sampled on the H. J. Andrews Experimental Forest and adjacent U. S. Plywood land to determine some genetic and stability relationships. The less than two micron size fraction from each sample was characterized by x-ray diffraction with respect to crystalline clay...
    Resource Type:
    Dissertation
    Full Text:
    of Philosophy June 1970 APPROVED Redacted for privacy Professor o in charge of major Redacted

  • Vegetation changes of communities containing medusahead (Taeniatherum asperum (Sim.) Nevski) following herbicide, grazing, and mowing treatments

    Creator:
    Turner, Robert Bruce
    Abstract:
    Studies were conducted from 1962 to 1966 to investigate the effectiveness of several practices in manipulating medusahead (Taeniatherum asperum (Sim. ) Nevski) infested and/or dominated ecosystems by releasing competition in favor of perennial grasses. Several herbicide treatments were evaluated for selective control of medusahead and cheatgrass (Bromus tectorum L. )...
    Resource Type:
    Dissertation
    Full Text:
    were evaluated for selective control of medusahead and cheatgrass (Bromus tectorum L.) and the

  • Influence of soil moisture on the movement of bromacil in soil

    Creator:
    Ross, Claude Gray
    Abstract:
    In previous research, bromacil gave good performance when it was applied in early fall with fairly dry soil conditions and before the fall germinating weeds had started growth. On the other hand, if bromacil was applied in late November, December, or January on nearly saturated soil with weeds that had...
    Resource Type:
    Masters Thesis
    Full Text:
    APPROVED: Assistant Professor of Farm l^rops In Charge of Major A dHead/bj Department of Farm Crops Dean

  • Aspects of the autecology of the plethodontid salamander, Aneides ferreus (Cope)

    Creator:
    McKenzie, Donald Samuel
    Abstract:
    Laboratory experiments and simulated field conditions were utilized to gain a better understanding of the ecology of the clouded salamander. Animals collected in western Oregon were utilized for studies in habitat selection, where it was shown that there was a significant pattern of selection of litter types (rock, bark, and...
    Resource Type:
    Dissertation
    Full Text:
    . Thanks are also due to Drs. Edmund 0. Brodie, James L. Kezer and Thomas R. Darrow for their aid in

  • Factors influencing the herbicidal activity of dimethyl 2,3,5,6-tetrachloroterephthalate

    Creator:
    McKinley, James Raleigh
    Abstract:
    Studies were conducted to determine the site of DCPA toxicity on annual ryegrass. This was done by means of a technique which used pyrex tubing and a vapor barrier to separate exposure of coleoptile and roots of emerging grass seedlings to various concentrations of DCPA. Coleoptiles that emerged through treated...
    Resource Type:
    Masters Thesis
    Full Text:
    committee. Mr. D. E. Stallard and Dr. L. Gordon Utter of the Diamond Alkali Company for their cooperation

  • The influence of magnesium on the toxicity of atrazine

    Creator:
    Brenchley, Ronald Glenn
    Abstract:
    Atrazine is an asymmetrical s-triazine herbicide used pre- and post emergence for weed control in many crops. Triazine herbicides have been used in the Pacific-Northwest for weed control in orchard crops. Under certain conditions where trees were grown in nutrient deficient areas, it was noted that toxic symptoms due to...
    Resource Type:
    Masters Thesis
    Full Text:
    + IIUW4UYá Lh O-ATR. i. t- , ea' r II mow sosisme MED-MG O -ATR. 6 1 13- MG X6 PPM-ATR