Systematic Study of Legacy Phosphorus (P) Desorption Mechanisms in High-P Agricultural Soils

Repeated manure additions containing phosphorus (P) in excess of crop needs have led to many agricultural soils with high levels soil P (i.e., legacy P), particularly the Delmarva region (USA). Due potential for release, it is important gain a better understanding mechanisms desorption and solubilization. Agricultural were collected from Peninsula, pools determined using suite wet chemical spectroscopic techniques, including modified Hedley sequential extraction X-ray absorption near-edge structure (XANES) spectroscopy. Five different solutions used investigate removal efficiency assess release mechanisms. The results indicate that sulfate can stronger competition than silicate, especially ditch sample 21% labile 44% adsorbed iron aluminum (via extraction). Additionally, linear combination fitting 10.5% organic 73.9% associated aluminum. This an finding because prevalent ion sea water, coastal area are threatened by level rise inundation.