Which nutrients are the most significant contributors to pollution affecting water quality?

Nitrogen and phosphorus are recognized as the most significant contributors to nutrient pollution affecting water quality. These nutrients are key components of fertilizers used in agriculture and landscaping, and when they enter water bodies through runoff, they can lead to a range of environmental problems.

When excess nitrogen and phosphorus enter water systems, they promote algal blooms. These blooms can deplete oxygen levels in the water, a process known as eutrophication, which can result in dead zones where aquatic life cannot survive. Furthermore, harmful algal blooms can produce toxins that affect drinking water supplies and aquatic ecosystems.

Addressing and managing the usage of nitrogen and phosphorus in agricultural practices is crucial for maintaining water quality and ecosystem health, making them central to nutrient management discussions and practices. Other nutrients like calcium, magnesium, sulfur, iron, potassium, and sodium are important for plant health but do not have the same level of impact on water quality issues when compared to nitrogen and phosphorus.