DOWNWARD MOVEMENT OF PHOSPHORUS AND IRON IN SOME PODZOLIC SOILS OF NEW JERSEY

When P32 and Fe59 were added to the surface horizons of a Podzol, a Brown Podzolic, and a Gray Brown Podzolic soil, it was found upon leaching of the profiles with Na2–EDTA in the laboratory that the movement of Fe was much greater than that of P.Of the added P32, 97% was leached from the A2 horizon of the Podzol as compared with only 8 to 9% from the corresponding horizon of the other two soils. In the Podzol, there were similar rates of release of native P and P32 throughout the leaching period.The movement of P and Fe was found to be associated in the Podzol and Gray Brown Podzolic but not in the Brown Podzolic profile.