LANDSCAPE POSITION AND PARTICLE-SIZE EFFECTS ON SOIL-PHOSPHORUS DISTRIBUTIONS

The objectives of this study were to investigate the effects of pedogenesis and landscape position on (i) the association of total P with particle-size content and with various particle-size separates, (ii) relative abundance of different forms of P, and (iii) distributions between horizons and soils representing five landscape positions on an Ultisol hillslope in northwest Florida. Total-P content in soil seemed to be directly associated with the amount of clay in the lower landscape positions. This association may be the result of the activity of the mineralogy dominant in the clay fraction. Total P in the clay and P-fraction values indicated that some P had been redistributed between horizons and possibly between soils on the landscape.