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In ancient times people already knew how to successfully use river and lake silt. It is in the valleys of big rivers - the Nile, the Tigris and the Euphrates, distinguished by powerful floods, where the first agricultural civilisations arose. Herodotus wrote that Egypt is a "gift of the Nile" because every year the Nile was overflowing and enriching soil with mellow layer, which is considered to be the best fertiliser.