Rising salinity in the Delta has multiple causes, experts and farmers say, including overextraction of groundwater and excessive use of fertilizers and pesticides. "With time, with the sea level higher, that line of salinity will go down into the Delta. EVAPORATIONSea water intrusion and salinity also threaten the Mekong Delta in Vietnam and the Ganges-Brahmaputra Delta in Bangladesh. "You have to do much better job in a place like the Nile Delta because the water just evaporates quickly," she said. Rice cultivation helps wash the soil, but the government has imposed restrictions on the crop in parts of the Delta to conserve scarce water.

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