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Filtering by: Creator Koskela, G. P. Remove constraint Creator: Koskela, G. P. Advisor Appleby, Arnold P. Remove constraint Advisor: Appleby, Arnold P.

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  • The reproduction and mode of spread of sago pondweed (Potamogeton pectinatus L.) in irrigation system

    Creator:
    Ogg, Alex G.
    Abstract:
    Nine experiments were conducted during 1964 and 1965 to study the methods of reproduction and mode of spread of sago pondweed (Potamogeton pectinatus) in irrigation systems. Frequent treatments of sago pondweed foliage with aromatic solvent greatly reduced the number of tubers in the substratum of an irrigation canal. However, complete...
    Resource Type:
    Masters Thesis
    Full Text:
    STANDS AND TUBER PRODUCTION 20 ECOLOGICAL STUDIES IN NEW IRRIGATION CHANNELS 28 Laterals WB5 G and

  • 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:
    Interference in Rice Grown on Hydromorphic Soils in West Africa Abstract approved:_Redacted for Privacy A. P

  • The effects of N-1-Naphthylphthalamic acid on growth of yellow nutsedge and its control with N-Phosphonomethyl glycine

    Creator:
    Paller, Enrique C.
    Abstract:
    Greenhouse and growth chamber experiments were conducted with the following objectives: (a) to study the effects of N-1-naphthylphthalamic acid (naptalam) on shoot and tuber production, rhizome transformation, and growth of yellow nutsedge (Cyperus esculentus L.) plants; (b) to study the effects of N-phosphonomethyl glycine (glyphosate) on nutsedge plants at different...
    Resource Type:
    Dissertation
    Full Text:
    sincere appreciation to Dr. Arnold P. Appleby for his guidance during my graduate program, and for his

  • 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:
    approved: Redacted for Privacy Dr. Arnold P. Appleby Equipment for strip-till planting is under

  • 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:
    (50 g, air-dried equivalent) at 2 and 20% soil moisture were treated with 484 pg of ethofumesate. The

  • The influence of certain environmental and edaphic factors on germination and emergence of Bromus tectorum L.

    Creator:
    Thill, Donald Cecil, 1950-
    Abstract:
    The influence of certain environmental and edaphic factors on the germination and emergence of downy brome (Bromus tectorum L.) was investigated in the laboratory. A preliminary study was conducted to determine the osmotic stability of mannitol and polyethylene glycol 20,000 (PEG) solutions, which are commonly used to simulate water stress...
    Resource Type:
    Dissertation
    Full Text:
    - arid plant species. Agron. J. 68:390-394. 18. Steinbauer, G. P. and B. H. Grigsby. 1957. Field and

  • Non-herbicidal effects of dinoseb on winter wheat yields

    Creator:
    Valverde, Bernal E.
    Abstract:
    A series of experiments were conducted from 1983 to 1985 to determine the effects of dinoseb [2-(1-methylpropyl)-4,6-dinitrophenol] on winter wheat (Triticum aestivum L. em Thell) yields. Field trials on dinoseb timing and dinoseb plus supplemental pesticides were established in an effort to elucidate the possible factors involved in the yield...
    Resource Type:
    Masters Thesis
    Full Text:
    supplemental pesticides included, in addition to dinoseb, a) preplant fumigation with 50 g/m 2 methyl

  • 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
    Full Text:
    for privacy Arnold P. Appleby Time-course growth chamber studies were conducted on little mallow

  • 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:
    Availability in Soil Abstract approved: Redacted for Privacy Arnold P. Appleby Glyphosate (N

  • Effect of glyphosate when applied to grass and legume seeds or preemergence to bentgrass (Agrostis tenuis Sibth.)

    Creator:
    Salazar, Luis Carlos
    Abstract:
    Paraquat (1,11-dimethy1-4,4'-bipyridinium ion) and glyphosate [N (phosphonomethyl)glycine] are herbicides utilized for chemical seedbed preparation in the establishment of grass and legume seed crops. When these herbicides are applied after seeding the crop, seeds which are not protected by a layer of soil could be exposed to the herbicide. Effects of...
    Resource Type:
    Masters Thesis
    Full Text:
    sincere appreciation to Dr. Arnold P. Appleby for his guidance, patient counseling, and encouragement