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Filtering by: Alternative title ssim Report no. 72-4 Remove constraint Alternative title ssim: Report no. 72-4 Advisor Appleby, Arnold P. Remove constraint Advisor: Appleby, Arnold P.

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  • 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:
    . The first ones to be used in no-till were the triazines, especially atrazine (2-chloro-4-ethylamino-6

  • 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:
    herbicidal activity of bromoxynil (3,5-dibromo-4-hydroxybenzonitrile) on Amsinckia intermedia AN ABSTRACT

  • Stimulation of plant growth by sub-lethal concentrations of herbicides

    Creator:
    Wiedman, Steven John
    Abstract:
    Studies were conducted to determine the extent and nature of sub-lethal effects of herbicides on plant growth. At least one herbicide from each major chemical class of herbicides was evaluated under greenhouse conditions. Oat plants were grown in sand culture to eliminate soil interferences. Herbicides were applied pre-emergence in nutrient...
    Resource Type:
    Dissertation
    Full Text:
    respiration - 48 hours. 33 4. Barban respiration - 72 hours. 33 5. Bromacil respiration - 48 hours. 33 6

  • Degradation of the herbicide EPTC in three Willamette Valley soils

    Creator:
    Coleman, Quentin Charles
    Abstract:
    EPIC (S-ethyl dipropylthiocarbamate) is a selective herbicide which controls some annual grasses, annual broadleaves, and perennial grasses when incorporated into the soil before planting. In the last few years, reports have been received of certain fields in the Willamette Valley of Oregon in which EPIC was no longer effective. Preliminary...
    Resource Type:
    Masters Thesis
    Full Text:
    Crop Science presented on Ifive,yyj,4,, VS! mini Title: DEGRADATION OF THE HERBICIDE EPTC IN THREE

  • Differential sensitivity of two common groundsel biotypes (Senecio vulgaris L.) to several s-triazine herbicides

    Creator:
    Radosevich, Steven R.
    Abstract:
    Studies were initiated to determine the response of two common groundsel biotypes (Senecio vulgaris L. ) to several s-triazine herbicides. Herbicides tested were: 2-chloro-4,6-bis(ethylamino)-striazine (simazine), 2-chloro-4-(ethylamino)-6-(isopropylamino)- s-triazine (atrazine) 2-(sec-butylamino)-4-(ethylamino)-6-methoxys- triazine (GS-14254), 2, 4-bis(isopropylamino)-6-methoxy-striazine (prometone), 2-(tert-butylamino)-4-(ethylamino)-6-methylthio- s-triazine (terbutryn), and 2, 4-bis(isopropylamino)-6- methylthio-s-triazine (prometryne). One biotype was much more susceptible than the...
    Resource Type:
    Dissertation
    Full Text:
    - cides. Herbicides tested were: 2-chloro-4,6-bis(ethylamino)-s- triazine (simazine), 2-chloro-4

  • The herbicide HOE 23408; soil persistence, spring wheat cultivar tolerance, and interaction with broadleaf herbicides

    Creator:
    Ivackovich, Branislav D.
    Abstract:
    HOE 23408 [ 4-(2' , 4'-dichlorophenoxy)-phenoxy-u-propionic methylester.1 is a promising new compound for control of wild oats and other grass weeds in small grains. Several factors influencing its use for this purpose were investigated. Greenhouse bioassay studies were conducted in 1975 to determine relative persistence of HOE 23408 in four...
    Resource Type:
    Masters Thesis
    Full Text:
    blades are flat, 4-8 mm wide, and scabrous. No auricules are present but ligules are well-devel- oped

  • Interaction between glyphosate and certain s-triazine herbicides

    Creator:
    Somabhi, Montien
    Abstract:
    Investigations were made in the field, greenhouse, growth chamber, and laboratory to: (a) observe the general activity of N- (phosphonomethyl)glycine (glyphosate); (b) determine the extent of its interaction with certain s-triazine herbicides; and (c) find an explanation for such an interaction. Greenhouse and growth chamber studies substantiated other observations that...
    Resource Type:
    Dissertation
    Full Text:
    field in com- bination with 2-chloro-4, 6- bis(ethylamino) -s- triazine (simazine), no clear

  • The influence of various surfactant-herbicide ratios in three volumes of water on the toxicity of dalapon, paraquat, and terbacil to winter oats (Avena sativa L.)

    Creator:
    Migchelbrink, Kenneth John
    Abstract:
    Several studies were conducted to determine if a more consistent predictor of phytotoxicity to winter oats could be obtained with a surfactant-herbicide ratio or a per-unit-volume concentration of surfactant, independent of volume. The herbicides tested were 2,2-dichloropropionic acid (dalapon), 1,1'-dimethyl-4, 4'-bipyridinium (paraquat), and 3-tert-butyl-5-chloro-6-methyluracil (terbacil) with the nonionic surfactant X-77...
    Resource Type:
    Masters Thesis
    Full Text:
    system whereby 0 = no injury; 1-3 = little injury, varying degrees of spotting and minor leaf burn; 4-6

  • Influence of lime on Italian ryegrass control in winter wheat with five herbicides

    Creator:
    Ozdilek, Engin
    Abstract:
    Liming has been shown to increase the activity of certain soil-applied herbicides. One research worker reported improved weed control with diuron after lime had increased soil pH levels. This could be caused by improved competitive ability of the wheat, greater availability of the herbicide, or a combination of the two...
    Resource Type:
    Masters Thesis
    Full Text:
    untreated ryegrass -infested wheat. However, liming had no effect on ryegrass growth nor activity of the

  • 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:
    ) primarily through shoot exposure, with root expo- sure having little or no effect on foliage growth. These