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Phosphorus and Nitrogen Sorption to Soils in the Presence of Poultry Litter‐Derived Dissolved Organic Matter
Author(s) -
Goyne Keith W.,
Jun HeeJoong,
Anderson Stephen H.,
Motavalli Peter P.
Publication year - 2008
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq2007.0141
Subject(s) - sorption , dissolved organic carbon , environmental chemistry , chemistry , poultry litter , organic matter , soil water , phosphorus , nitrogen , total organic carbon , soil organic matter , environmental science , nutrient , adsorption , soil science , organic chemistry
Two environmental aspects associated with land application of poultry litter that have not been comprehensively evaluated are (i) the competition of dissolved organic matter (DOM) and P for soil sorption sites, and (ii) the sorption of dissolved organic nitrogen (DON) relative to inorganic nitrogen species (e.g., NO 3 − and NH 4 + ) and dissolved organic carbon (DOC). The competition between DOM and P for sorption sites has often been assumed to increase the amount of P available for plant growth; however, elevating DOM concentrations may also increase P available for transport to water resources. Batch sorption experiments were conducted to (i) evaluate soil properties governing P sorption to benchmark soils of Southwestern Missouri, (ii) elucidate the impact of poultry litter‐derived DOM on P sorption, and (iii) investigate DON retention relative to inorganic N species and DOC. Soils were reacted for 24 h with inorganic P (0–60 mg L −1 ) in the presence and absence of DOM (145 mg C L −1 ) using a background electrolyte solution comparable to DOM extracts ( I = 10.8 mmol L −1 ; pH 7.7). Soil P sorption was positively correlated with metal oxide ( r 2 = 0.70) and clay content ( r 2 = 0.79) and negatively correlated with Bray‐1 extractable P ( r 2 = 0.79). Poultry litter‐derived DOM had no significant negative impact on P sorption. Dissolved organic nitrogen was preferentially removed from solution relative to (NO 3 − –N + NO 2 − –N), NH 4 + –N, and DOC. This research indicates that poultry litter‐derived DOM is not likely to enhance inorganic P transport which contradicts the assumption that DOM released from organic wastes increases plant‐available P when organic amendments and fertilizer P are co‐applied. Additionally, this work demonstrates the need to further evaluate the fate and transport of DON in agroecosystem soils receiving poultry litter applications.