Phosphorus and Nitrogen Sorption to Soils in the Presence of Poultry Litter‐Derived Dissolved Organic Matter

Abstract

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.

Amending Subsoil with Composted Poultry Litter-I: Effects on Soil Physical and Chemical Properties

“…Along with the reduction in odor, pathogens, and weeds, composting also immobilizes highly mobile NO 3 − in the litter to its slow-release form [9][10][11]. It is also easier to handle, store, transport, and apply litter that has been composted [12].…”

Nitrogen Accumulation and Loss in a High-input Greenhouse Vegetable Cropping System Elevated by Application of Manures

“…The EON stock only peaked in the seasons when chicken manure applied (Fig. 3), likely due to the direct input of EON from manures (Goyne et al, 2008) since the chicken manure is rich in EON (Table 2). EON stocks decreased obviously with the enhancement of irrigation in the later periods of vegetable growth.…”

“…Other forms of leachable N, especially EON, have been suggested to be taken into account when evaluating N leaching risk due to its large contribution to N migration in the soil profile (Bhogal et al, 2000;Khalili and Nourbakhsh, 2012;Siemens and Kaupenjohann, 2002). Especially in greenhouse soils, often-applied manures may be a direct source of EON subject to leaching loss (Goyne et al, 2008). Hence, simultaneous investigation of accumulation and migration of nitrate and EON is needed to better understand the scale and the dynamics of N migration and leaching loss in greenhouse soils.…”

Interactive influence of Fe–Mn and organic matter on pentachlorophenol sorption under oxic and anoxic conditions

“…The chemically mediated oxidation-reduction potential may alter the chemical and physical characteristics of the soil including local pH increases, leading to increased dissolution of soil organic matter. Studies have shown that sorption is governed by competing sorbates as dissolved organic matter (DOM) in ligand exchange, as well as pH and ionic strength [18][19][20]32,33]. In addition, as redox potential decreases further, soils/sediments release manganese Mn 2+ and iron Fe 2+ via the microbiological and chemical reduction of metal oxides [18,19,34].…”