How does phosphorus that forms relatively insoluble inorganic compounds in soils find its way as a pollutant into streams and other waterways? Compare the organic P levels in the upper horizons of a...

How does phosphorus that forms relatively insoluble inorganic compounds in soils find its way as a pollutant into streams and other waterways?

Compare the organic P levels in the upper horizons of a forested soil with those of a nearby soil that has been cultivated for 25 years. Explain the difference.