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

Minerals

Monica Elavarthi¹  Kathryn Daria Szerlag²  Matthew G. Siebecker³  Donald Lewis Sparks⁴  Conner McCrone⁴  Chunhao Gu⁴ 

[1] Department of Chemical Engineering, University of Delaware, Newark, DE 19716, USA;Department of Environmental Science, Westfield State University, Westfield, MA 01086, USA;Department of Plant and Soil Science, Texas Tech University, Lubbock, TX 79409, USA;Department of Plant and Soil Science, University of Delaware, Newark, DE 19716, USA;

关键词: phosphorus;    legacy P;    Hedley sequential extraction;    poultry manure;    desorption;   

DOI  :  10.3390/min12040458

来源: DOAJ

【 摘 要 】

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

【 授权许可】

Unknown