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Filtering by: Creator Bartley, Ronald C. Remove constraint Creator: Bartley, Ronald C. Subject Herbicides Remove constraint Subject: Herbicides

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  • 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:
    AN ABSTRACT OF THE THESIS OF Ronald Glenn Brenchley for the Master of Science (Name of student

  • Influence of weed density on efficacy of two soil-applied herbicides

    Creator:
    Burrill, L. C.
    Abstract:
    Several studies were conducted to determine the effect of weed density on herbicide efficacy. Diuron [3-(3, 4- dichlorophenyl) -1, 1- dimethylurea] was tested on various densities of Italian ryegrass (Lolium multiflorum Lam. ) under greenhouse and field conditions. Cycloate (S-ethyl N-ethylthiocyclohexanecarbamate) was tested on green foxtail (Setaria viridis (L. )...
    Resource Type:
    Masters Thesis
    Full Text:
    presented Typed by Mary Jo Stratton for Larry C. Burrill ACKNOWLEDGEMENTS I wish to express my sincere

  • Factors influencing wild oat control with N-benzoyl-N-(3,4-dichlorophenyl) alanine (SD 30053)

    Creator:
    Colbert, Donald Robert
    Abstract:
    Studies were conducted in 1969 and 1970 to evaluate the effectiveness of an experimental herbicide, SD 30053 (alanine, N-benzoyl-N-(3, 4-dichlorophenyl)-, ethyl ester), for wild oat (Avena fatua L.) control in winter cereals. The 1969 field studies showed that postemergence applications of SD 30053 were effective in controlling wild oats. Wild...
    Resource Type:
    Masters Thesis
    Full Text:
    the preparation of this manuscript. I am grateful to Dr. Ronald J. Burr, Department of Agronomic

  • Interaction between glyphosate and certain s-triazine herbicides

    Creator:
    Somabhi, Montien
    Abstract:
    Investigations were made in the field, greenhouse, growth chamber, and laboratory to: (a) observe the general activity of N- (phosphonomethyl)glycine (glyphosate); (b) determine the extent of its interaction with certain s-triazine herbicides; and (c) find an explanation for such an interaction. Greenhouse and growth chamber studies substantiated other observations that...
    Resource Type:
    Dissertation
    Full Text:
    interaction with certain s-triazine herbicides; and (c) find an explana- tion for such an interaction

  • Factors influencing metribuzin use in strip-planted wheat

    Creator:
    Zeghida, Ali
    Abstract:
    Equipment for strip-till planting is under development in wheat-fallow rotations in the Columbia Basin of Oregon. This involves the absence of tillage during the fallow season. At planting time, the strip-till planter creates a narrow band into which the wheat seed is placed. The area between the rows is undisturbed...
    Resource Type:
    Masters Thesis
    Full Text:
    thank Dr. H. Ronald Cameron, Dr. Michael D. Glenn, Dr. Donald Claypool, and. Dr. Willis McCuistion for

  • Stimulation of plant growth by sub-lethal concentrations of herbicides

    Creator:
    Wiedman, Steven John
    Abstract:
    Studies were conducted to determine the extent and nature of sub-lethal effects of herbicides on plant growth. At least one herbicide from each major chemical class of herbicides was evaluated under greenhouse conditions. Oat plants were grown in sand culture to eliminate soil interferences. Herbicides were applied pre-emergence in nutrient...
    Resource Type:
    Dissertation
    Full Text:
    discussions and assistance. To Drs. David 0. Chilcote, Thomas C. Moore, and V. Van Volk for serving as

  • Differential sensitivity of two common groundsel biotypes (Senecio vulgaris L.) to several s-triazine herbicides

    Creator:
    Radosevich, Steven R.
    Abstract:
    Studies were initiated to determine the response of two common groundsel biotypes (Senecio vulgaris L. ) to several s-triazine herbicides. Herbicides tested were: 2-chloro-4,6-bis(ethylamino)-striazine (simazine), 2-chloro-4-(ethylamino)-6-(isopropylamino)- s-triazine (atrazine) 2-(sec-butylamino)-4-(ethylamino)-6-methoxys- triazine (GS-14254), 2, 4-bis(isopropylamino)-6-methoxy-striazine (prometone), 2-(tert-butylamino)-4-(ethylamino)-6-methylthio- s-triazine (terbutryn), and 2, 4-bis(isopropylamino)-6- methylthio-s-triazine (prometryne). One biotype was much more susceptible than the...
    Resource Type:
    Dissertation
    Full Text:
    . Appreciation is expressed to Mrs. La Rae Johnston, Depart- ment of Botany, and Dr. Ronald J. Burr, Department

  • Microbial degradation of atrazine in soils

    Creator:
    Skipper, H. D. (Horace D.)
    Abstract:
    Atrazine is an asymmetrical s-triazine herbicide used pre- and post-emergence for the control of weeds in many crops. Under conditions considered unfavorable for microbial activity, atrazine may persist in soils for extended periods of time. However, the significance of chemical versus microbial degradation is not known. This study was conducted...
    Resource Type:
    Masters Thesis
    Full Text:
    protection against atrazine residues. Atrazine- treated soil was incubated at 30 °C for varying periods

  • The soil persistence and crop selectivity of 3, 6-dichloropicolinic acid

    Creator:
    Olson, David Lloyd
    Abstract:
    Field studies were conducted in 1973 and 1974 to determine the soil persistence of the herbicide M-3785 (containing 0.5 lb a.e. Dowco 290 + 2.0 lb a.e. 214D/gallon). under cropping situations. Spring barley (Hordeum distichon L. 'Hannchen') was grown at Corvallis, Oregon and winter wheat (Triticum aestivum L. 'Nugaines.') was...
    Resource Type:
    Masters Thesis
    Full Text:
    encouragement, sacrifice, and love made this thesis a reality. My most sincere appreciation to Dr. Ronald Burr

  • The effects of the herbicides Diquat and Dichlobenil on pond invertebrates

    Creator:
    Wilson, Dennis Carl
    Abstract:
    The acute toxicity of Diquat (1:1-ethylene-2:2' dipyridylium dibromide) and Dichlobenil (2, 6-dichlorobenzonitrile) to six selected pond invertebrates was determined using the median tolerance limit estimation method. Diquat was more toxic to the amphipod, Hyalella azeteca than to the aquatic insects Callibaetis, Limnephilus, Enallagma, Libellula, and Tendipedidae. The addition of mud...
    Resource Type:
    Masters Thesis
    Full Text:
    statistical analysis of the data. Dr. Howard F. Horton and Mr. Robert C. Averett reviewed the manuscript