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What are the factors that caused the shift from particulate to dissolved phosphorus in the streams to Lake Erie?

Phosphorus in soils can naturally fluctuate between solid and dissolved forms.  This is largely influenced by the minerals in the soil, the form of applied fertilizers and to a lesser extent by the decomposition of available organic matter.  Temperature, acidity of the soil (pH) and other dissolved chemicals will also play a role in phosphorus solubility.

Gail Hesse, Ohio EPA