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Filtering by: Alternative title ssim Report no. 74-6 Remove constraint Alternative title ssim: Report no. 74-6 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 conventional bare fallow to a complete chemical fallow or "no- till" system (6). The common base

  • 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:
    Figure 6 and Appendix Table 6. There were no significant differences between dicamba and 294 D

  • 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:
    received of certain fields in the Willamette Valley of Oregon in which EPIC was no longer effective

  • 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:
    -200 0 R biotype A S biotype 0.5 ppm simazine No simazine / Simazine removed 1 L 6 12 24 30 Time

  • 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

  • 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

  • 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:
    -ethylamino-6-isopropylamino- s-triazine) and magnesium on tomatoes. This interaction was studied under two

  • 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:
    the crop weed-free later in the growing season. At 6 weeks after emergence, most of the weed species

  • Selective control of Cirsium arvense (L.) Scop. in Mentha piperita L. with 3,6-dichloropicolinic acid

    Creator:
    Whitesides, Ralph E.
    Abstract:
    A series of field experiments was conducted during 1975 and 1976 to examine peppermint tolerance and Canada, thistle response to Dowco 290 (3, 6- dichloropicolinic acid). Peppermint oil yield and Canada thistle density were considered most important in evaluating experimental results. Peppermint tolerance to Dowco 290 was studied in weed-free...
    Resource Type:
    Masters Thesis
    Full Text:
    plots treated with 0.5, 1.0, and 2.0 lb /A when evaluated 6 months later. No abnormal 15 Figure 2