Phosphorus
Phosphorus
Phosphorus is an important nutrient for plant growth. Point-source phosphorus comes mainly from municipal and industrial discharges to surface waters. Nonpoint-source phosphorus comes from agricultural fields, urban runoff, construction sites, feedlots, and septic systems. Most point-source phosphorus is dissolved, whereas most nonpoint-source phosphorus is sediment-attached.
Phosphorus is an important nutrient for plant growth. Point-source phosphorus comes mainly from municipal and industrial discharges to surface waters. Nonpoint-source phosphorus comes from agricultural fields, urban runoff, construction sites, feedlots, and septic systems. Most point-source phosphorus is dissolved, whereas most nonpoint-source phosphorus is sediment-attached.
Elevated levels of phosphorus stimulate the growth of algae. The death and decay of algae can deplete the supply of oxygen in the river. Excessive algae growth, death, and decay can severely deplete oxygen supply, endangering fish and other kinds of aquatic life. Low dissolved oxygen rates are particularly a concern during low flow times or in slow-flowing areas such as reservoirs and the lower reaches of the Minnesota River.