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Filtering by: Creator Paul, B. K. Remove constraint Creator: Paul, B. K. Subject Herbicides Remove constraint Subject: Herbicides

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  • Response of downy brome (Bromus tectorum) and Kentucky bluegrass (Pao pratensis) to primisulfuron

    Creator:
    Hendrickson, Paul E.
    Abstract:
    Glasshouse and growth-chamber experiments were conducted to evaluate primisulfuron phytotoxicity and the influence of adjuvants on downy brome and Kentucky bluegrass. GR₅₀ (50% growth reduction) values were 0.97 ± 0.57 and 8.07 ± 1.85 g/ha for downy brome and Kentucky bluegrass, respectively. Primisulfuron was applied to downy brome and Kentucky...
    Resource Type:
    Masters Thesis
    Full Text:
    bluegrass (Pao pratensis) to primisulfuron AN ABSTRACT OF THE THESIS OF Paul E. Hendrickson for the

  • Some effects of certain insecticides and herbicides on soil bacteria

    Creator:
    Johns, Elvy Earl
    Resource Type:
    Masters Thesis
    Full Text:
    Chemistry, Oregon Stato College. I especially thank Dr. W. B. Bollen of the Department of Bacteriology

  • Effect of Endothal and certain other selective herbicides on microbial activity in six different soils

    Creator:
    Au, Frederick Hung Fo
    Abstract:
    The effect of Endothal (3, 6-endoxyhexahydrophthalic acid), sodium pentachlorophenate (Na-PCP) and TD-47 (di-N, N-dimethylcocoamine salt of Endothal) on the microbial populations, ammonification, nitrification and respiration in six different soils was investigated. It was found that Endothal at 20 and 200 ppm had no adverse effect on the microbial population, ammonification,...
    Resource Type:
    Dissertation
    Full Text:
    DIFFERENT SOILS Abstract approved: Redacted for privacy Walter B. Bollen The effect of Endothal (3, 6

  • The decomposition of 2-chloro-4-ethylamino-6-isopropylamino-S-triazine (atrazine) and related s-triazine herbicides by soil microorganisms

    Creator:
    Duke, William B.
    Abstract:
    Atrazine, atratone and ametryne are asymmetric s-triazine herbicides used pre- and post-emergence on many crops. Under conditions unfavorable for microbial activity, these compounds may persist in the soil for long periods of time. This study was conducted to determine the influence of the soil microflora upon atrazine, atratone and ametryne...
    Resource Type:
    Masters Thesis
    Full Text:
    AN ABSTRACT OF TTIE THESIS OF WL1llam B. Duke for the M.S

  • The influence of herbicide placement in soil on toxicity to emerging seedlings

    Creator:
    Nishimoto, R. K. (Roy Katsuto), 1944-
    Abstract:
    Previous research has indicated several soil-applied herbicides are more effective by exposure to emerging shoots than from root uptake. Studies were conducted in the greenhouse and growth chamber to investigate effects of herbicide placement in soil on toxicity to emerging seedlings. In these studies, an inch of treated soil was...
    Resource Type:
    Masters Thesis
    Full Text:
    herbicide classes, b) to determine if an experimental technique involving the use of a plastic bag over

  • Interaction of selected herbicides with soil constituents

    Creator:
    El-Madhun, Yousef Abdel Wahab
    Abstract:
    The behavior of six herbicides in soil was studied under controlled laboratory conditions. Sorption of bromacil, chiorotoluron and diuron was assessed by the batch equilibration procedure over a broad range of aqueous phase sorbate concentration. Linear equilibrium sorption constants (K[subscript p]) were slightly higher at 4° C than at 25°...
    Resource Type:
    Dissertation
    Full Text:
    an entropy driven mechanism. Water solubilities (S) and octanol-water partition coefficients (K ow

  • Horticultural weed control : 1997 report

    Creator:
    Oregon State University. Department of Horticulture
    Abstract:
    Crops were grown at the experimental farms using accepted cultural practices ( within the limits of experimentation) or trials were conducted on growers' fields. Most experiments were designed as randomized complete blocks with three to five replications. Herbicide treatments were applied uniformly with precision plot sprays. Unless otherwise indicated, preplant...
    Resource Type:
    Technical Report
    Full Text:
    Annual ryegrass (1994)/ 484b 254 369 abc 0.7 1.9 0.38 0.00 Monida oat (1995) Cereal rye 180 b 156 168

  • Surfactant effects on bromacil and picloram adsorption by Oregon soils

    Creator:
    Gaynor, John Donald
    Abstract:
    The physical and chemical properties of soils greatly affect the toxicity of bromacil and picloram. Consequently, a knowledge of the parameters which influence the soil inactivation of these herbicides is necessary to determine proper application rates for good weed control. Enhancement in phytotoxicity with the addition of surfactants or surface...
    Resource Type:
    Masters Thesis
    Full Text:
    significant correlation coefficient of 0.913 was calculated between the Freundlich K value for bromacil

  • 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:
    K/ha, and 11-0-0-26 at 22 kg S/ha, with three metri- buzin formulations each of Sencor and Lexone

  • 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:
    10 b 100 1-11`k 50 d Water I I I I I 1 I 2 4 6 8 10 12 14 Hours in solution Figure 2