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