Abstract
<p>Glyphosate [N-(phosphonomethyl) glycine] is an enzyme inhibiting herbicide, which is widely used in the world. Here, we investigate the glyphosate adsorption potential in tropical soils with pH close to 5. The herbicide was determined via HPLC with detection by UV-Vis. Our results suggest that glyphosate interacts especially with the stabilized organic matter. Thus, even with large amounts of soil organic matter, the soils may not be as effective in the adsorption of the herbicide if they do not also possess high percentage of humic substances. These data are worth far as it allows us to speculate on glyphosate interaction mechanism with the humic substances in slightly acid medium, in addition, also enable us to propose the use of that fraction of the organic matter to immobilize part of the herbicide in the soil and inhibiting its leaching into water bodies.</p>
Highlights
Among the several methods typically used to control the proliferation of weeds in crops, chemical methods are the most used
These data are worth far as it allows us to speculate on glyphosate interaction mechanism with the humic substances in slightly acid medium, in addition, enable us to propose the use of that fraction of the organic matter to immobilize part of the herbicide in the soil and inhibiting its leaching into water bodies
The chemical characterization of soil samples were based on the following attributes: pH in 0.01 mol L-1 CaCl2; organic matter content; clay content was determined according to NBR 7181, using decantation with sodium hexametavanadate (ABNT, 1986, 1984), and humic substances content by using the method proposed by the International Humic Substances Society (IHSS) (Sparks et al, 1996)
Summary
Among the several methods typically used to control the proliferation of weeds in crops, chemical methods are the most used. Concerning the methods to control weeds, the use of herbicides is quick, and easy to apply in crops (Green, 2014). The previous recognition of the predominant invasive plant is a basic condition for the proper choice of the product that will result in weed control of fruitful manner. The use of herbicides involves high losses of economic, social and environmental nature (Kraehmer et al, 2014). For long periods, herbicides may affect terrestrial and aquatic environments. Herbicides may be responsible for high levels of contamination and/or intoxication levels recorded between producers and rural workers, as well as lead to contamination of food (Annett et al, 2014)
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