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1622. H horizon : Is an organic horizon formed or forming an accumulation of organic material deposited on the surface, that is saturated with water for prolonged periods, unless artificially drained. H horizons form at the surface of wet soils, either as thick cumulative layers in organic soil or as thin layers of peat or muck over mineral soils. Even when ploughed, the surface soil keeps a high content of organic matter following the mixing of peat with mineral material. The formation of H horizon is related to prolonged water-logging, unless soils are artificially drained.

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