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character: Dr. Mark Stevens
topic: The Role of Humic Substances in Soil Chemistry
grade: 12
subject: Chemistry
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character: Dr. Lisa Green
topic: Soil Organic Matter and Nutrient Cycling
grade: 12
subject: Chemistry
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character: Dr. John Carter
topic: Influence of Soil pH on Humic Substance Interaction
grade: 12
subject: Chemistry
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character: Dr. Emily White
topic: The Impact of Humic Acids on Soil Fertility
grade: 12
subject: Chemistry
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