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

^a Dep. of Soil, Environmental, and Atmospheric Sciences, 302 ABNR Building, Univ. of Missouri, Columbia, MO 65211-7250
^b National Institute of Agricultural Science and Technology, Suwon, Korea

View larger version (18K): [in this window] [in a new window]   Fig. 1. Phosphorus sorption to Clarksville (a) A and (b) B soil horizons, Goss (c) A and (d) B soil horizons, and Tonti (e) A and (f) B soil horizons in absence and presence of dissolved organic matter (DOM) (145 mg C L–1). (Means of triplicate samples are shown and error bars that are larger than the symbol represent 95% C.I.). Lines represent fits to modified Langmuir equation.

View larger version (18K): [in this window] [in a new window]   Fig. 2. Change in suspension pH (mean values shown) as a function of phosphorus sorption (qp) after reaction for (a) A horizons and (b) B horizons reacted with P in the absence and presence of dissolved organic matter (DOM). Line represents mean pH of control samples (no soil) after reaction.

View larger version (13K): [in this window] [in a new window]   Fig. 3. Sorption of dissolved organic carbon (DOC) (qDOC) as a function of suspension pH. Data points represent mean values obtained from phosphorus sorption experiments conducted in presence of dissolved organic matter (DOM) (145 mg C L–1).

View larger version (53K): [in this window] [in a new window]   Fig. 4. Dissolved organic nitrogen (DON)/(NO3––N + NO2––N) ratio in equilibrium solution of soils reacted with dissolved organic matter (DOM) (145 mg C L–1) in absence of phosphorus. The line represents mean DON/(NO3––N + NO2––N) ratio in control solutions (no soil). Asterisk (*) indicates significant difference in the DON/(NO3––N + NO2––N) ratio in equilibrium sample solutions relative to control solutions (p 0.05). Bar indicates LSD(0.05) value; NS: not significant.

View larger version (56K): [in this window] [in a new window]   Fig. 5. Dissolved organic nitrogen (DON)/NH4+–N ratio in equilibrium solution of soils reacted with dissolved organic matter (DOM) (145 mg C L–1) in absence of phosphorus. The line represents mean DON/NH4+–N ratio in control solutions (no soil). Asterisk (*) indicates significant difference in the DON/NH4–N ratio in equilibrium sample solutions relative to control solutions (p 0.05, t-tests). Bar indicates LSD(0.05) value; NS: not significant.

View larger version (54K): [in this window] [in a new window]   Fig. 6. Dissolved organic carbon (DOC)/dissolved organic nitrogen (DON) ratio in equilibrium solution of soils reacted with dissolved organic matter (DOM) (145 mg C L–1) in absence of phosphorus. The line represents mean DOC/DON ratio in control solutions (no soil). Asterisk (*) indicates significant difference in the DOC/DON ratio in equilibrium sample solutions relative to control solutions (p 0.05, t-tests). Bar indicates LSD(0.05) value; NS: not significant.