Explain one way agriculture can affect water quality

Fertilisers/pesticides (1) could seep into the ground (1) and contaminate ground water (1). • Liquid from farm slurry (1) could enter the river (1) causing eutrophication (1). • Deforestation (1) could increase run off (1) carrying more soil and silt into rivers (1). • Cattle waste/cattle in river (1) directly into the river (1) contaminating the water (1).