Assume that you add a soluble phosphate fertilizer to an Oxisol and to an Aridisol. In each case, within a few months most of the phosphorus has been changed to insoluble forms. Indicate what these...

Assume that you add a soluble phosphate fertilizer to an Oxisol and to an Aridisol. In each case, within a few months most of the phosphorus has been changed to insoluble forms. Indicate what these forms are and the respective compounds in each soil responsible for their formation.

How does the phosphorus content of cultivated soils in the eastern United States or northern Europe compare with that of nearby forest soils that have never been cleared? What is the reason for this difference?