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• feeding on the plants in large quantities. Concentrations of these potentially toxic <br />cations were found to be very low in the soils of the SGFA. As with potassium and <br />phosphorus, a general trend of decreasing concentrations with increasing depth was <br />identified for the cations calcium, magnesium, zinc, iron, and manganese. The <br />generally low concentrations of these cations may be related to the near-neutral pH <br />environment, as cations are more mobile in low and high pH environments. <br />~~ <br />• <br />_12_ <br />