Fluvisols are cultivated for dryland crops or rice and are used for grazing during the dry seasons.
Fluvisols are technically defined by a weak or nonexistent surface horizon (uppermost layer) and by parent material derived from river, lake, or marine sediments which have been deposited at regular intervals or in the recent past.
These soils exhibit a stratified profile which reflects their depositional history or an irregular layering of humus (nonliving, finely divided organic matter in soil, derived from microbial decomposition of plant and animal substances) and mineral sediments in which the content of organic carbon decreases with depth and wide variations in texture and mineral composition are observed.
Fluvisols are related to the Inceptisol and Entisol orders of the U.S. Soil Taxonomy, wherever the latter occur on floodplains and deltas.
Fluvisols are sometimes found in conjunction with Gleysols, a related FAO soil group formed under the influence of water.2. From the classification system of the Food and Agriculture Organization, FAO.
3. Etymology: from Latin fluvius, "river".