Nitrogen:Phosphorus (N:P) Ratio All Lakes 1990-2014

Calculating a relatively simple Nitrogen/Phosphorus (N/P) ratio can sometimes provide a useful clue as to the relative importance of nitrogen or phosphorus toward the abundance of algae in a waterbody. Studies of Leelanau County lakes have shown that the ratio of total nitrogen to total phosphorus (TN/TP) may indicate which nutrient plays the most significant limiting role.