Eutrophication: A Threat to Freshwater Bodies?

📌 CONCEPT: Eutrophication is the excessive growth of aquatic plants due to an overabundance of nutrients in a body of water, which can lead to the degradation of the ecosystem and have severe consequences for the local community.

📐 RULE / FORMULA: The key principle is the NPK (nitrogen-phosphorus-potassium) ratio in fertilizers, which can disrupt the natural balance of the lake's ecosystem.

💡 WORKED EXAMPLE: If a fertilizer containing 20% nitrogen, 10% phosphorus, and 5% potassium is applied to the agricultural farm, it can lead to an increase in the concentration of nitrates and phosphates in the lake's water. This, in turn, can stimulate the growth of algae, deplete the oxygen levels in the water, and ultimately harm the aquatic life. The local community may experience problems such as reduced water quality, decreased fish populations, and increased risk of waterborne diseases.

⚠️ COMMON MISTAKE: Students often underestimate the impact of eutrophication on the lake's ecosystem and the community, failing to consider the long-term consequences of fertilizer runoff and the importance of maintaining a balanced NPK ratio in fertilizers.