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Filtering by: DOI 10.5194/bg-8-3423-2011 Remove constraint DOI: 10.5194/bg-8-3423-2011 Advisor Appleby, Arnold P. Remove constraint Advisor: Appleby, Arnold P.

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  • 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:
    samples collected 16 weeks, 8 weeks, 4 weeks, 2 weeks, 1 weekiand immediately after spraying from the

  • Biology and control of tuber oatgrass (Arrhenatherum elatius (L.) presl. var. Bulbosum (willd.) spenn.)

    Creator:
    Tanphiphat, Karin
    Abstract:
    Tuber oatgrass (Arrhenatherum elatius (L.) Presl. var. bulbosum (Willd.) Spenn.) is a perennial grass that often becomes a weed problem in Western Oregon. Control efforts using glyphosate often give unsatisfactory results. The effects of several factors on development of tuber oatgrass were investigated. Long days and cool temperatures (16/8h, 20/10C...
    Resource Type:
    Dissertation
    Full Text:
    day/night hastened corm formation in plants growing under short days (8/16h day/night), but not in

  • Competitive effects and control of weeds in winter wheat on the Anatolian Plateau, Turkey

    Creator:
    Tezel, Cengiz
    Abstract:
    Wheat is the major crop produced on the Anatolian Plateau of Turkey. Annual weeds cause large yields reductions in the wheat crop. Several formulations of 2, 4-D and mixtures of 2, 4-D and 2,4, 5-T are the only materials currently available for use in Turkey on wheat. The objective of...
    Resource Type:
    Masters Thesis
    Full Text:
    8 weeks and was handweeded for the remainder of the season. The other set was kept free of weeds

  • 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:
    , atrazine rates of 0, 1/16, 1/8, and 1/4 ppm were added to pots containing the plants. Plants were

  • Selective control of volunteer wheat (Triticum aestivum (L.) em. Thell.) in new seedlings of alfalfa (Medicago sativa L.) with fluazifop-butyl and sethoxydim

    Creator:
    Ott, Pablo
    Abstract:
    Volunteer winter wheat (Triticum aestivum 'Daws') severely suppressed growth of fall-planted alfalfa (Medicago sativa (L.) 'Vernal') seedlings. Wheat competition began soon after alfalfa emerged and continued until the first forage harvest the following May. Alfalfa yield at the first cutting was reduced by 1% for each day volunteer wheat was...
    Resource Type:
    Masters Thesis
    Full Text:
    wheat regardless of the soil moisture content (8% vs 15%). The activity of fluazifop-butyl at 0.12

  • A proposed mechanism for diuron-induced phytotoxicity

    Creator:
    Stanger, Charles Earl, 1929-
    Abstract:
    Previous research has shown that specific carotenoid pigments function through oxidation-reduction reactions to protect chlorophyll from photooxidation in the presence of reduced nicotinamide adenine dinucleotide phosphate (NADP). The hypothesis that diuron (3-(3, 4- d chloropheny1)-1, 1-dimethylurea) initiates phytotoxicity by inhibition of NADPH synthesis was examined. All experiments were conducted in...
    Resource Type:
    Dissertation
    Full Text:
    was necessary to express diuron toxicity. After 8 hr of illumination, chlorophyll concentration in

  • 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:
    between ethofumesate application and soil wetting was varied between 0 and 8 days to study the rate of

  • The agronomic, environmental, and economic implications of the introduction of terbacil for weed control in Oregon commercial peppermint operations

    Creator:
    Harris, James O.
    Abstract:
    The use of terbacil for weed control was adapted by a high percentage of Oregon peppermint growers soon after its introduction in 1967. To help clarify some of the implications of terbacil usage, three studies were undertaken to collect information concerning (a) the movement and build-up of terbacil in various...
    Resource Type:
    Masters Thesis
    Full Text:
    County and from two Willamette Valley wells 41 8 Chronology of peppermint oil prices in the United

  • Persistence of prodiamine and norflurazon herbicides in soil and their activity on alfalfa rotational crops

    Creator:
    Fischer, Vernon F.
    Abstract:
    Norflurazon [4-chloro-5-(methylamino)-2(3-(trifluoromethyl) phenyl)- 3(2H)- pyridazinone] and prodiamine (N3, N3-di-n-propy1-2,4- dinitro-6-(trifluoromethyl)-m-phenylenediamine) are two herbicides being considered for weed control in alfalfa. Rotational crops following alfalfa may be sensitive to residues of these herbicides. Studies were conducted in Oregon and Washington to examine the soil persistence and activity of these herbicides on...
    Resource Type:
    Masters Thesis
    Full Text:
    . 18 19 20 21 22 23 LIST OF TABLES Table No. Page 1. 2. 3. 4. 5. 6. 7. 8. 9. Green

  • Factors affecting selective weedy rye (Secale sp.) control in winter wheat with the herbicide ethiazin

    Creator:
    Diener, Phillip R.
    Abstract:
    Weedy rye (Secale spp.) is a weed in the winter-wheat- growing regions in the Pacific Northwest and surrounding regions. Ethiazin (4-amino-6-(1,1-dimethylethyl)-3- (ehtylthio)-1,2,4-triazine-5 (4H)-one) has shown selective control of weedy rye in the cultivar 'Stephens', (Triticum aestivum). Field, greenhouse, and outdoor pot experiments were conducted to determine factors influencing selectivity. Field...
    Resource Type:
    Masters Thesis
    Full Text:
    treatments at various rates and timings (Peterson trial). 7 8 9 Analysis of variance fro % control of