SEARCH Articles Figures Tables An Introduction to Humic Substances in Soil, Sediment, and Water Humic material/substances soil/terrestrial Humic soils Humic substances Humic substances amended soils Humic substances surface soils In soil humic substances Nature and Classification of Soil Humic Substances Of soil humic substances Soil Science Humic Substances Soil humic substances, heavy metal Soil-root interactions, humic substances Soil: acidification 352 humic substances Soils substances Structural analysis of humic substances in water and soils