Fertilizer runoff has a negative impact on aquatic ecosystems because
a. it causes plants and algae to grow quickly, suffocating organisms in the water
When nutrients and other contaminants connected with animal manures and commercial fertilisers are not adequately handled, they can have a harmful impact on plant and animal life (including people). Algal blooms deplete oxygen in surface waters, pathogens and nitrates in drinking water, and the release of smells and chemicals into the atmosphere are just a few of the effects.
Manure and fertiliser nutrients reach lakes and streams via runoff and soil erosion. When soil-test nitrogen (N) and phosphorus (P) levels rise, more plant-available N and P migrate with the water.
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