Significant vanillin degradation occurred only in soil amended with 9% montmorillonite and not in soil amended with 9% kaolinite or in soil without addition of clay minerals. Progressively decreasing amounts of vanillin were mineralized in the montmorillonite-amended soil with increasing acidification with H2SO4, and complete inhibition of mineralization occurred at a soil pH of 1.6.
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Bewley et al. (1984) studied this question.
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