What are negative effects of heavy irrigation?

Heavy irrigation though contributes to the expansion and intensification of agriculture, has negative effects on the environment. It has the potential for causing: increased erosion; pollution of surface water and groundwater from agricultural biocides; deterioration of water quality; increased nutrient levels in the irrigation and drainage water resulting in algal blooms, proliferation of aquatic weeds and eutrophication in irrigation canals and downstream waterways. 

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