Results 321 to 330 of about 91,550 (356)

Role of Humified Organic Matter in Herbicide Adsorption

Weed Technology, 1989
Organic matter is the soil constituent most often associated with herbicide adsorption. Structural diversity makes humified organic material an ideal substrate for the adsorption of many pesticides, but variability in composition and distribution in situ complicates interpretation of its quantitative effect on adsorption.
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Extraction of four herbicides from passive organic vapor monitors

Journal of Environmental Science and Health, Part B, 1990
Abstract Four herbicides (2,4‐D, MCPA, trifluralin, and triallate) were applied to and extracted from 3M #3500 Organic Vapor Monitors that use an activated charcoal pad as an adsorbent. Carbon disulfide (2 mL) with the addition of diazomethane in ethyl ether (1 mL) as the extracting liquid gave the best recovery results for all four pesticides. Average
Gary Bruns, Miles Constable
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Soil Organic Matter Sensing for Precision Herbicide Application

1990
A prototype sensor which used near infrared (NIR) reflectance techniques to determine the organic matter content of the surface layer of soil was developed and was tested both in the laboratory and in the field. Laboratory predictions yielded an r2 of 0.89 and a standard error of prediction of 0.23% organic carbon (0.40% organic matter) with 30 ...
KA Sudduth, JW Hummel, RC Funk
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Residues from Organic Arsenical Herbicides in Chemically Thinned Forests

Journal of Environmental Quality, 1986
AbstractConifers in four Pacific Northwest locations and forest types were stem‐injected with the organic arsenicals cacodylic acid and monosodium methanearsonate (MSMA), herbicides used for forest thinning and insect control. Concentrations and locations of As residues in tree stems, twigs, foliage, and in litter and soil were determined.
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Concentrations of Herbicides in Wetlands on Organic and Minimum‐Tillage Farms

Journal of Environmental Quality, 2018
Wetlands are abundant throughout the agricultural landscape of central Saskatchewan, Canada, and the biota present in these wetlands may be vulnerable to the toxic effects of pesticides used on nearby crops. We hypothesized that herbicide concentrations would be higher in wetlands on minimum‐tillage farms than on organic (no herbicide use) farms, and ...
David B, Donald, Allan J, Cessna, Annemieke, Farenhorst   +2 more
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HERBICIDES THE RELATIVE TOXICITY OF NITROPHENOLS TO VARIOUS ORGANISMS

Annals of Applied Biology, 1952
The effect of increasing degrees of nitration on the toxicity of phenols was assessed by measuring the toxicity of phenol, o‐ and p‐nitro phenols and 2:4‐dinitro phenol with several different test organisms. Toxicity levels were determined by the concentration required in each case to bring about the following responses: (i) to halve the rate of radial
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Peroxidizing Herbicides: Toxicology to Mammals and Non-target Organisms

1999
The peroxidizing herbicides constitute a growing group of industrial chemicals (for a review see Duke et al. 1991; Boger and Wakabayashi 1995). Their exact mode of action was elucidated only quite recently, when it was realised that these compounds block the enzymatic oxidation of protoporphyrinogen to protoporphyrin (Matringe et al.
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Comparative evaluation of organic herbicides for okra weed management

Journal of Applied Horticulture
Two field experiments were conducted at the Department of Vegetable Science, College of Agriculture, Vellayani, to investigate the impact of various weed control treatments on weed growth and okra production. Weed management is a significant challenge in organic okra farming, often relying on labour-intensive and environmentally harmful mechanical ...
S. Saranya, M. Rafeekher
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Organic Substrates and Microbial Conversion of Herbicides in Soil

1992
ABSTRACT Kunc, F., 1991. Organic substrates and microbial conversion of herbicides in soil. Presence of organic compounds in soil is one of the main factors that determine the activity of microorganisms including their capability of conversion of xenobiotics.
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Hydroxyl group-enriched microporous organic network for high-performance solid-phase extraction of triazine herbicides: Experiment and DFT calculation on adsorption behavior

Chemical Engineering Journal, 2022
Jin-Ming Lin, Ru-Song Zhao
exaly