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Hydric soil:

Soil that, in its undrained state, is flooded long enough during a growing season to develop anaerobic conditions that support the growth and regeneration of hydrophytic vegetation (plants specialized to grow in water or in soil too waterlogged for most plants to survive). This term is part of the legal definition of a wetland included in the Food Security Act of 1985. The Natural Resources Conservation Service maintains a national list of hydric soils.

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