Qualified Applicator Certificate (QAC) Landscape And Maintenance Practice Test

Over-fertilization can significantly impact water quality, particularly through the processes of nutrient runoff and eutrophication. When fertilizers are applied excessively, the nutrients, especially nitrogen and phosphorus, can wash away into nearby waterways during rain or irrigation. This nutrient runoff can lead to eutrophication, a condition where the waterbody becomes overly enriched with nutrients. In this enriched environment, algae and aquatic plants can thrive excessively, resulting in algal blooms. While these blooms may initially seem beneficial by supporting more plant life, they can have detrimental effects on the aquatic ecosystem. As the algae die, their decomposition consumes oxygen in the water, leading to hypoxic conditions that can harm or kill fish and other aquatic organisms. This process diminishes water quality, making it less suitable for drinking, recreation, and supporting aquatic life. In contrast, the other options do not reflect the consequences of over-fertilization. For example, increasing habitats for fish or improving water for irrigation contradict the negative impacts of nutrient overload. Understanding this connection between over-fertilization and water quality is crucial for implementing effective landscaping and maintenance practices that protect aquatic ecosystems.