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Ohio Fertilizer Applicator Certification Practice Test

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Which primary nutrient is linked to cyanobacteria growth?
Correct Answer:
Potassium
Explanation:
Nutrient availability and how it drives cyanobacterial blooms in water bodies is the idea being tested. Cyanobacteria need nutrients to grow, and phosphorus is a key nutrient that often limits or fuels their rapid proliferation in freshwater ecosystems. When phosphorus enters a lake or river—through runoff from fertilizers, wastewater, or detergents—it can remove the constraints on growth, allowing cyanobacteria to multiply quickly and form noticeable blooms. Nitrogen also influences growth, but in many freshwater systems phosphorus is the primary driver that enables these blooms. Potassium, while essential for cellular activities, doesn’t typically trigger cyanobacterial blooms and isn’t the nutrient most linked to these events.

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