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  • Interference of annual weeds in seedling alfalfa

    Creator:
    Fischer, Albert J.
    Abstract:
    The interference of barnyardgrass (Echinochloa crusgalli), pigweed (Amaranthus retroflexus),downy brome (Bromus tectorum),and tumble mustard (Sisymbrium altissimum) with alfalfa was studied. Alfalfa was seeded with each of the four weeds on August 14 and September 15, 1981, and on April 13, 1982. Alfalfa also was seeded on August 27, 1981, with...
    Resource Type:
    Masters Thesis
    Full Text:
    Interference of Annual Weeds in Seedling Alfalfa AN

  • Apoplastic distribution of atrazine and glyphosate in intact sunflower leaves

    Creator:
    Jachetta, John Joseph
    Abstract:
    Apoplastic distribution patterns of atrazine [2-chloro-4-(ethylamino)- 6-(isopropylamino)-s-triazine], glyphosate [N-(phosphonomethyl)- glycine], the naturally occurring apoplastic leaf solutes, and the apoplastic dye PTS (trisodium 3-hydroxy-5,8,10-pyrenetrisulfonate) were compared. Aliquots of sap were expressed from intact sunflower leaves in a pressure chamber over intervals of 0.2 to 0.4 bars. Three distinct fractions were detected...
    Resource Type:
    Dissertation
    Full Text:
    with each increment of pressure to a value close to deionized water. The concentration of atrazine in

  • The effect of 2,4-D on the respiration rate and ethylene production of Bartlett pears and Red Delicious apples

    Creator:
    Fechtig, Allen David
    Abstract:
    After nearly 20 years of commercial use in orchards without apparent tree injury in Oregon and Washington, 2,4-D [(2,4-dichlorophenoxy) acetic acid] was reported in 1970 to cause injury to apple and pear trees in Washington. In the early 1970's, there was widespread concern among growers, researchers, and processors in the...
    Resource Type:
    Dissertation
    Full Text:
    sampling area After cleansing the sampling tools, the first 5-cm increment was collected in a

  • 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:
    variety of tree fruits, nut crops, vegetables, and mint for annual grass and broadleaf weed control. When

  • Influence of soil moisture on the movement of bromacil in soil

    Creator:
    Ross, Claude Gray
    Abstract:
    In previous research, bromacil gave good performance when it was applied in early fall with fairly dry soil conditions and before the fall germinating weeds had started growth. On the other hand, if bromacil was applied in late November, December, or January on nearly saturated soil with weeds that had...
    Resource Type:
    Masters Thesis
    Full Text:
    weeks following herbi cide application on dry soil. Field bioassay with rape, wheat, oats, annual

  • 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:
    the Anatolian Plateau of Turkey. Annual weeds cause large yields reductions in the wheat crop

  • 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:
    Verticillium wilt (Verticillium albo-atrum or V. dahliae), many growers had quit annual plowing of their mint

  • 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:
    beets (Beta vulgaris) and annual rye - grass (Lolium multiflorum) through shoot exposure than root

  • 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:
    potentials from -2 to -16 bars, and incubated at alternat- ing and constant mean temperatures from 5.1 to 20

  • Sethoxydim herbicide in red fescue and bentgrass : levels and mechanisms of selectivity

    Creator:
    Butler, J. Hugh B.
    Abstract:
    The herbicide rate required to reduce growth by 50% (GR₅₀) of 11 cultivars of red fesue (Festuca rubra L. and F. rubra ssp. commutata) and for four cultivars of bentgrass (Agrostis tenuis Sibth. and A. stolonifera L. var. palustris) to sethoxydim (2-[1-(ethoxyimino) butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one) was determined in greenhouse and laboratory experiments....
    Resource Type:
    Dissertation
    Full Text:
    tested in the greenhouse were > 4 kg/ha for annual bluegrass (Poa annua L.), 0.22 kg/ha for tall