What would be a limiting nutrient in freshwater pond?

Phosphorus is often the limiting nutrient in freshwater ponds. This is because phosphorus is essential for plant growth, but it is often in short supply in freshwater environments. Plants need phosphorus to produce chlorophyll, which is necessary for photosynthesis. Phosphorus is also important for cell division and growth. When phosphorus is limited, plant growth is slowed down and the plants may become stunted. This can have a negative impact on the entire ecosystem, as plants are the foundation of the food chain.