Phosphorus Release from a Manure‐Impacted Spodosol: Effects of a Water Treatment Residual

摘要: Long-term depositions of animal manures affect P dynamics in soils and can pose environmental risks associated with losses. Laboratory studies were done on solubility characteristics a manure-impacted Immokalee soil (sandy, siliceous, hyperthermic Arenic Alaquod) the effectiveness water treatment residual (WTR) controlling leaching. Soil samples contrasting initial total concentrations prepared by mixing surface A horizon minimally P-impacted E horizon. Effects various ratios horizons, WTR rates (0, 25, 50, 100 g kg -1 ), depths incorporation (mixed throughout column or partially incorporated) leaching determined. Between 62 77% was released from mixes successive extractions, suggesting considerable buffering capacity this to resupply into solution. 224 408 mg leached during 36-wk period absence WTR. Mixing WTRs reduced soluble concentration leachates as much 99.8% compared without Thoroughly entire (15 cm) more efficient than only top 7.5 cm soil. Calcium- Mg-P forms appear control release WTR, whereas sorption-desorption reactions probably determine WTR-treated samples. distribution chemical affected additions. Data suggest that WTR-immobilized is stable long term.