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

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dc.creatorSzerlag, Kathryn Daria
dc.creatorElavarthi, Monica
dc.creatorSiebecker, Matthew G. (TTU)
dc.creatorGu, Chunhao
dc.creatorMcCrone, Conner
dc.creatorSparks, Donald Lewis
dc.date.accessioned2023-04-05T19:12:24Z
dc.date.available2023-04-05T19:12:24Z
dc.date.issued2022
dc.description© 2022 by the authors. Licensee MDPI, Basel, Switzerland. cc-by
dc.description.abstractRepeated 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.
dc.identifier.citationSzerlag, K.D., Elavarthi, M., Siebecker, M.G., Gu, C., McCrone, C., & Sparks, D.L.. 2022. Systematic Study of Legacy Phosphorus (P) Desorption Mechanisms in High-P Agricultural Soils. Minerals, 12(4). https://doi.org/10.3390/min12040458
dc.identifier.urihttps://doi.org/10.3390/min12040458
dc.identifier.urihttps://hdl.handle.net/2346/92539
dc.language.isoeng
dc.subjectdesorption
dc.subjectHedley sequential extraction
dc.subjectlegacy P
dc.subjectphosphorus
dc.subjectpoultry manure
dc.titleSystematic Study of Legacy Phosphorus (P) Desorption Mechanisms in High-P Agricultural Soils
dc.typeArticle

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