Evidence for the leaching of dissolved organic phosphorus to depth

Phosphorus (P) can leach from topsoil in inorganic and organic forms. While some evidence has shown P (orthophosphate) to depth soils, less is known of dissolved (DOP). This not helped by a paucity DOP data for groundwater. We hypothesized that species would greater amounts at faster rate through aquifer gravels than orthophosphate. applied superphosphate with or without dung low P-sorption soil under pasture irrigation. Between 0.7 (control) 2.4 (dung +superphosphate) kg ha?1 was leached 30 cm mean ratio DRP 1.5. At 50 cm, 1.3 the decreasing 1.1 due leaching (or sorption). There little difference losses measured 150 depth. All compounds except monoester – inositol hexakisphosphate were orthophosphate gravels. These suggest where soils overlay similarly aquifers, may reach groundwater Furthermore, as many are bioavailable periphyton, our should be included assessment risk contamination connection baseflow could long-term stimulant periphyton growth.