HORTICULTURE

Detailed explanation-1: -An overabundance of nutrients-primarily nitrogen and phosphorus-in water starts a process called eutrophication. Algae feed on the nutrients, growing, spreading, and turning the water green. Algae blooms can smell bad, block sunlight, and even release toxins in some cases.

Detailed explanation-2: -Excess nutrients from manure or other agricultural runoff raise the amount of nitrogen or phosphorus in the water. These increases make algae bloom and lower oxygen levels in the water. The increases also make water plants grow too much.