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Filtering by: Creator Barnett, W. W. Remove constraint Creator: Barnett, W. W. Contributor advisor sim Appleby, Arnold P. Remove constraint Contributor advisor sim: Appleby, Arnold P. Decade 1980-1989 Remove constraint Decade: 1980-1989

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  • Effect of a pre-irrigation period on the activity of ethofumesate applied to dry soil

    Creator:
    McAuliffe, David
    Abstract:
    Applications of ethofumesate in Oregon have been observed from previous research and from commercial use to be less effective when applied to dry soils, even if subsequent precipitation occurred within a few days. Two field studies were established in the summer of 1979 using sweet corn (Zea mays L. 'Jubilee')...
    Resource Type:
    Masters Thesis
    Full Text:
    approximately 2 and 30% w/w soil moisture. After 2 to 4 days, all soils were irrigated for stand establishment

  • Cyperus esculentus control with glyphosate : time of application and addition of ammonium sulfate

    Creator:
    Costa, Jaime
    Abstract:
    Cyperus esculentus L. var. esculentus is a serious weed problem in northwest Spain. Long-term control from glyphosate and other herbicides has been inconsistent. Field, greenhouse, and laboratory studies were conducted on factors influencing the activity of glyphosate on C. esculentus. In field studies, glyphosate controlled foliage growth at most growth...
    Resource Type:
    Dissertation
    Full Text:
    review of this manuscript. My gratitude to Dr. W. Chilcote, Dr. R.V. Frakes, and Dr. T. Moore for

  • Activity and persistence of five postemergence grass herbicides in soil

    Creator:
    Martin, David C. (David Christopher), 1949-
    Resource Type:
    Masters Thesis
    Full Text:
    0.0, 0.0625, 0.125, 0.25, 0.5, 1.0, and 2.0 ppm (w/w dry soil) of DPX-Y6202, fluazifop-butyl

  • Interaction of ethofumesate with dry soil

    Creator:
    McAuliffe, David
    Abstract:
    Previous studies have shown loss of ethofumesate activity when the herbicide was applied to dry soil (2% w/w moisture content) in both field and greenhouse studies, even when rainfall or irrigation was received within a few days. Laboratory studies were conducted to determine the mechanism for this activity loss. Dry...
    Resource Type:
    Dissertation
    Full Text:
    applied to dry soil (2% w/w moisture content) in both field and greenhouse studies, even when rainfall or

  • Studies of napropamide decomposition on the soil surface

    Creator:
    Apley, Kathryn Lynne
    Abstract:
    Napropamide [2-(alpha-naphthoxyl)-N,N-diethylpropionamide], a preemergence herbicide, is widely used in the United States on a variety of tree fruits, nut crops, vegetables, and mint for annual grass and broadleaf weed control. When napropamide has been left on the soil surface without incorporation through irrigation or mechanical means, inconsistent results have been...
    Resource Type:
    Masters Thesis
    Full Text:
    into the energy units of watt-hours/meter2 (W-h/m2) by an EPLAB electronic integrator Model 412 which

  • Postemergence herbicides and take-all disease in winter wheat : alterations in the incidence and severity of disease and crop growth

    Creator:
    Geddens, Ray M.
    Abstract:
    Eight postemergence herbicides were evaluated to determine their influence on the incidence and severity of take-all disease caused by the fungus Gaeumannomyces graminis var. tritici in winter wheat. Mecoprop ((+)-2-(4-chloro-2-methylphenoxy)propanoic acid), difenzoquat (1,2- dimethyl- 3,5- diphenyl -1H- pyrazolium), dinoseb amine (amine salt of 2-(1-methylpropy1)-4,6-dinitrophenol), and diclofopmethyl (methyl ester of (+)-2-[4-(2,4-dichlorophenoxy)...
    Resource Type:
    Dissertation
    Full Text:
    Willamette silt loam soil with no inoculum and 0.5% w/v ground, colonized oats. 2.3 Effect of diclofop

  • Effects of lactofen herbicide on cellular uptake of glyphosate herbicide in malva parviflora L.

    Creator:
    Wells, Barbara Heard
    Abstract:
    Time-course growth chamber studies were conducted on little mallow (Malva parviflora L.) to determine whether sublethal doses of lactofen (1'-(carboethoxy)ethyl-5-[2-chloro-4-(trifluoromethyl) phenoxy]-2- nitrobenzoate) would enhance uptake of glyphosate (N'-(phosphonomethyl) glycine) by altering membrane permeability. Lactofen-induced membrane peroxidation was determined by harvesting leaf discs, measuring stress ethylene evolution, and recording increases in...
    Resource Type:
    Dissertation

  • Dinitroaniline-herbicide resistance in goosegrass (Eleusine indica) : ecophysiological aspects

    Creator:
    Valverde, Bernal E.
    Abstract:
    Growth of individual goosegrass (Eleusine indica (L) Gaertn.) plants of three dinitroaniline-herbicide resistant (R) and three susceptible (S) biotypes from North Carolina, South Carolina, and Mississippi was analyzed in greenhouse experiments. Leaf area and biomass measurements, including root, shoot, above-ground, and total dry weights were similar among the biotypes studied....
    Resource Type:
    Dissertation
    Full Text:
    ® 2 O Adams * Marlboro 0/"ti6 0.,s. ,, /W -7 / 0 10 20 30 40 50 60 70 Days after Transplanting

  • Behavior of metribuzin and ethylmetribuzin in soil

    Creator:
    Peek, Daniel C.
    Abstract:
    The behavior of metribuzin [4-amino-6-(1,1- dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one] and ethyl-metribuzin (4-amino-6-(1,1-dimethylethyl)-3- (ethylthio)-1,2,4-triazin-5(4H)-one] in soil was studied to determine if differences in herbicide behavior in soil could explain (a) the inconsistent herbicidal activity of these chemicals and (b) the greater activity of metribuzin, as compared to ethyl-metribuzin. Metribuzin had higher activity than ethyl-metribuzin...
    Resource Type:
    Dissertation
    Full Text:
    chromatography. Soil Sci. Soc. Am. Proc. 35:732-737. 10. Iyengar, S. S., L. W. Zelazny, and C. C. Martens

  • The effect of soil factors on glyphosate availability in soil

    Creator:
    Kawate, Michael Ken
    Abstract:
    Glyphosate (N-(phosphonomethyl)glycine) is an effective foliar-applied herbicide with broad-spectrum activity. Greenhouse and laboratory experiments were conducted to determine the importance of soil moisture, autoclaved soil, soil type, sphagnum peat, soil pH, added phosphorus, and plant residues on crop establishment and growth when glyphosate was applied before emergence of the crop....
    Resource Type:
    Dissertation
    Full Text:
    as a liquid in a soil mixer. Soil moisture was increased by 20% (w/w) while mixing. Moisture also