When fertilizer enters the surface What affect dose it do to the watershed?

When fertilizer enters the surface water in a watershed, it can lead to nutrient pollution, causing excessive growth of algae and other aquatic plants. This overgrowth, known as eutrophication, can deplete oxygen levels in the water, leading to harmful algal blooms, fish kills, and overall degradation of water quality. It can also impact human health and ecosystem balance within the watershed.