Using the phosphorus data from the table, calculate the percentage of each phosphorus source that enters the Mississippi from the city of St. Paul.

Answer/Explanation:

% of each Nitrogen source = amount of Nitrogen from each source/total amount if Nitrogen × 100

% of Nitrogen from atmospheric deposition:

Approximately 18%

% of Nitrogen from household pet waste:

Approximately 28%

% of Nitrogen from residential fertilizer:

Approximately 51%

% of Nitrogen from weathering:

0%

% of Nitrogen from county compost:

Approximately 3%

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