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Environment and health
Agrochemical usage (pesticides and fertilizers) in Mauritius is linked primarily to the intensive cultivation of sugar cane and some 7 000 ha under food crops and vegetables. For control of weeds in sugar cane, about 630 tonnes of herbicides are applied annually, the major ones being divron, atrazine and 2-41. The application rate of fertilizer is within the limit of 600 kg/ha. Today there is no risk of groundwater pollution from fertilizers and the nitrate concentration in groundwater is well below WHO threshold values. Waterlogging and salinization is normally not a problem in Mauritius.
The coastal areas in the north and east are subjected to seawater intrusion, particularly during drought periods when the aquifers are depressed. The water quality from reservoirs and boreholes is suitable for overhead irrigation. For drip irrigation water has to be filtered from algae and suspended solids before being distributed.