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  • The persistence of five herbicides in Hawaiian soil

    Creator:
    Kitagawa, Yukio
    Abstract:
    The persistence of DCPA, trifluralin, diphenamid, diuron, and prometryne was studied in three soils which were located at the Kula, Poamoho, and Waimanalo Experiment Stations. The order of decreasing persistency was diuron, prometryne, trifluralin, DCPA, and diphenamid. Diuron and prometryne activities were recorded for at least six months and diuron...
    Resource Type:
    Masters Thesis
    Full Text:
    Agricultural Experiment Station for their help. In addi- tion, the writer thanks his wife, Tsuyuko, for her

  • Effect of timing and rate of metribuzin on wheat and barley cultivars and on Italian ryegrass

    Creator:
    Durutan, Nedret
    Abstract:
    A field study was conducted in 1973 and 1974 to determine optimum timing of metribuzin (4-amino-6-tert-butyl-3(methylthio) as - tria.zine-5(4H)one) on winter wheat (Triticum aestivum L. 'Hyslop') for control of Italian ryegrass (Lolium multiflorum Lam. ). Herbicide treatments were applied at 5 different stages of growth of winter wheat. Metribuzin at...
    Resource Type:
    Masters Thesis
    Full Text:
    . 1971. Basic studies on the properties of BAY-94337. Annual Report, Experiment Station, Hawaiian Sugar

  • 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:
    Experiment Station. This was the only trial for which the technique differed from that discussed in the

  • 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:
    . To the Oregon Agricultural Experiment Station and the National Institute of Health for financial

  • 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:
    difficult. To the Oregon Agricultural Experiment Station and the Nation- al Institute of Health for

  • Effect of two methylcarbamates on the toxiciity of isopropyl m-chlorocarbanilate (chlorpropham) to safflower (Carthamus tinctorius L.) and common buckwheat (Fagopyrum esculentum Moench.)

    Creator:
    Kirkland, Kenneth
    Abstract:
    Addition of the methylcarbamate compounds p-chlorophenyl N-methylcarbamate (PPG-124) and 1-naphthyl N-methylcarbamate (carbaryl) to various herbicides has resulted in reduced rates of degradation. Carbaryl affects the degradation of certain herbicides in both plants and soils while PPG-124 has only been demonstrated to affect degradation in soils. Both these materials are effective...
    Resource Type:
    Masters Thesis
    Full Text:
    Experiment I. Effect of 72 -hour Exposure to Chlorpropham - PPG-124 on Dry Weight of Safflower Roots and

  • 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:
    Experiment Station at Pullman Washington. The first edition of his "Manual of the Grasses of the United

  • 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:
    EXPERIMENTS General Materials and Methods Pendleton Experiment Station Trial 1973 Materials and Methods

  • The influence of light, temperature and humidity on the herbicidal activity of bromoxynil (3,5-dibromo-4-hydroxybenzo-nitrile) on Amsinckia intermedia

    Creator:
    Zimmerman, Martin (Martin Joseph)
    Abstract:
    The use of bromoxynil (3,5-dibromo-4-hydroxybenzonitrile) to control broadleaf weeds in cereal crops has become widespread. This herbicide has not always performed satisfactorily for reasons which were not clearly evident. The effects of temperature, light and humidity on the herbicidal activity of bromoxynil on coast fiddleneck, Amsinckia intermedia, were studied. Fiddleneck...
    Resource Type:
    Masters Thesis
    Full Text:
    . 3-59. (Oregon. Agricul- tural Experiment Station. Technical Bulletin 100) 12. Hart, R., J. Bishop

  • An evaluation of weed interference in rice grown on hydromorphic soils in West Africa

    Creator:
    Diop, Amadou Makhtar
    Abstract:
    Field, screenhouse, and laboratory experiments were conducted to study weed interference in rice grown on hydromorphic soils at the International Institute of Tropical Agriculture (IITA) at Ibadan, Nigeria. Rice and weeds emerged at the same time, 1 week after planting. Weed dry weight was significantly reduced when the crop was...
    Resource Type:
    Dissertation
    Full Text:
    . WEED INTERFERENCE WITH RICE 26 INTRODUCTION 26 MATERIALS AND METHODS 27 Experiment 2.1. Critical