Search Constraints

Start Over
Filtering by: Subject Soils -- Herbicide movement Remove constraint Subject: Soils -- Herbicide movement Language English [eng] Remove constraint Language: English [eng]

Search Results

  • 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:
    SOIL. GENERAL INTRODUCTION Glyphosate is an effective foliar-applied herbicide with broad-spectrum

  • Persistence and accumulation of clopyralid (3,6-dichloropicolinic acid) in soil

    Creator:
    Tanphiphat, Karin
    Abstract:
    Field studies were started at Hyslop Farm, Corvallis, Oregon in 1984 to determine the soil persistence of the herbicide clopyralid (3,6-dichloropicolinic acid) under cropping situations. The herbicide was sprayed on bare soil at the proposed use rate of 0.14 kg/ha in the spring and on the same plots at a...
    Resource Type:
    Masters Thesis
    Full Text:
    started at Hyslop Farm, Corvallis, Oregon in 1984 to determine the soil persistence of the herbicide

  • Behavior of metribuzin and ethylmetribuzin in soil

    Creator:
    Peek, Daniel C.
    Abstract:
    The behavior of metribuzin [4-amino-6-(1,1- dimethylethyl)-3-(methylthio)-1,2,4-triazin-5(4H)-one] and ethyl-metribuzin (4-amino-6-(1,1-dimethylethyl)-3- (ethylthio)-1,2,4-triazin-5(4H)-one] in soil was studied to determine if differences in herbicide behavior in soil could explain (a) the inconsistent herbicidal activity of these chemicals and (b) the greater activity of metribuzin, as compared to ethyl-metribuzin. Metribuzin had higher activity than ethyl-metribuzin...
    Resource Type:
    Dissertation
    Full Text:
    quartz sand was lower than in soil when drainage could occur. Herbicide movement was greatest and

  • Water and solute transport : modeling and application to water conservation in layered soil

    Creator:
    Mohammed, Fareed H. A. N.
    Abstract:
    Sandy soils are among the least productive soils because of their inability to store adequate water for plant growth. Their high percolation rate not only allows water to move quickly beyond the root zone, but also washes nutrients below the reach of plant roots. High evaporation occurs from the soil...
    Resource Type:
    Dissertation
    Full Text:
    The objectives 5 2. WATER MOVEMENT IN SOILS 7 2.1 Factors affecting water movement 7 2.2 Soil water

  • Interaction of ethofumesate with dry soil

    Creator:
    McAuliffe, David
    Abstract:
    Previous studies have shown loss of ethofumesate activity when the herbicide was applied to dry soil (2% w/w moisture content) in both field and greenhouse studies, even when rainfall or irrigation was received within a few days. Laboratory studies were conducted to determine the mechanism for this activity loss. Dry...
    Resource Type:
    Dissertation
    Full Text:
    etho- fumesate degradation. To determine the effect of soil type, the herbicide was applied to air

  • Some effects of certain insecticides and herbicides on soil bacteria

    Creator:
    Johns, Elvy Earl
    Resource Type:
    Masters Thesis
    Full Text:
    b.TCA 32 c. 2,!i,-T 32 Figure L1.. Herbicide Soil Count3. Fungi. a.IPC 33 b. TCA 33 c. 2,Li,S

  • The decomposition of 2-chloro-4-ethylamino-6-isopropylamino-S-triazine (atrazine) and related s-triazine herbicides by soil microorganisms

    Creator:
    Duke, William B.
    Abstract:
    Atrazine, atratone and ametryne are asymmetric s-triazine herbicides used pre- and post-emergence on many crops. Under conditions unfavorable for microbial activity, these compounds may persist in the soil for long periods of time. This study was conducted to determine the influence of the soil microflora upon atrazine, atratone and ametryne...
    Resource Type:
    Masters Thesis
    Full Text:
    remain i.n the soiL for long perlods of time. This nay cause a serious probiem from herbicide solL

  • Microbial degradation of atrazine in soils

    Creator:
    Skipper, H. D. (Horace D.)
    Abstract:
    Atrazine is an asymmetrical s-triazine herbicide used pre- and post-emergence for the control of weeds in many crops. Under conditions considered unfavorable for microbial activity, atrazine may persist in soils for extended periods of time. However, the significance of chemical versus microbial degradation is not known. This study was conducted...
    Resource Type:
    Masters Thesis
    Full Text:
    Redacted for Privacy (Major professor) Atrazine is an asymmetrical s- triazine herbicide used pre- and

  • Effect of Endothal and certain other selective herbicides on microbial activity in six different soils

    Creator:
    Au, Frederick Hung Fo
    Abstract:
    The effect of Endothal (3, 6-endoxyhexahydrophthalic acid), sodium pentachlorophenate (Na-PCP) and TD-47 (di-N, N-dimethylcocoamine salt of Endothal) on the microbial populations, ammonification, nitrification and respiration in six different soils was investigated. It was found that Endothal at 20 and 200 ppm had no adverse effect on the microbial population, ammonification,...
    Resource Type:
    Dissertation
    Full Text:
    residue of the herbicide in the soil. Associated problems with soil residues are: movement by leaching

  • Hydrolysis and biological degradation of atrazine in soils

    Creator:
    Skipper, H. D. (Horace D.)
    Abstract:
    Detoxification of atrazine in soils results from both chemical hydrolysis and microbial degradation. Infrared analysis was used to study the hydrolysis of atrazine upon interaction with soil colloids and to ascertain the existence of enol, keto, and protonated-keto forms of hydroxyatrazine. Evolution of ¹⁴CO₂ from ¹⁴C-atrazine and ¹⁴C-hydroxyatrazine was indicative...
    Resource Type:
    Dissertation
    Full Text:
    study the hydrolysis of atrazine upon interaction with soil colloids and to ascertain the existence of