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CSS302-Lecture25 - Herbicides and Soil soil I Adsorption II...

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Herbicides and Soil Three processes that affect the fate of herbicides in  soil:  I. Adsorption II. Movement A. Volatilization B. Leaching C. Run-Off D. Plant Uptake
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Herbicides and Soil III. Degradation A. Photodecomposition B. Chemical Degradation C. Microbial Degradation
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I. Adsorption: Attraction/adhesion of herbicides to the surface of a soil particle (clay, O.M.) - Most important factor influencing herbicide  availability to plants - Several chemical processes involved
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I. Adsorption: - Herbicides adsorbed by: 1) Clay (inorganic) - generally carry net __________  charge
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I. Adsorption: - Herbicides adsorbed by: 1) Clay (inorganic) - generally carry net negative charge - adsorptive capacity related to CEC  montmorillonite > illite >_________
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I. Adsorption: - Herbicides adsorbed by: 1) Clay (inorganic) - generally carry net negative charge - adsorptive capacity related to CEC  montmorillonite > illite >________ 2) Organic Matter - single greatest factor affecting  adsorption
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