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Relationships between Biosolids Treatment Process and Soil Phosphorus Availability

^a Dep. Plant and Soil Science, Univ. of Delaware, Newark, DE 19717-1303
^b Dep. Civil and Environmental Engineering, Univ. of Delaware, Newark, DE 19717-1303
^c Dep. Natural Resource Science and Landscape Architecture, Univ. of Maryland, College Park, MD 20742-5821

View larger version (25K): [in a new window]   Fig. 1. The influence of biosolids type on water-soluble phosphorus concentrations in the (a) Elkton and (b) Suffolk soils during the 51-d incubation study. Data are for Biosolids 1, 2, 4, and 6 (B1, B2, B4, B6). Note differences in scale for the y axis.

View larger version (27K): [in a new window]   Fig. 2. The influence of biosolids type on iron-oxide strip–extractable phosphorus (FeO-P) concentrations in the (a) Elkton and (b) Suffolk soils during the 51-d incubation study. Data are for Biosolids 1, 2, 4, and 6 (B1, B2, B4, B6).

View larger version (29K): [in a new window]   Fig. 3. Relationship between (a) Mehlich-3 phosphorus in biosolids and (b) the molar ratio of USEPA 3050 phosphorus to [Al + Fe] in biosolids and the changes in water-soluble phosphorus (WSP), normalized per 100 kg P/ha added, in the Elkton and Suffolk soils during the incubation study.

View larger version (31K): [in a new window]   Fig. 4. Relationship between (a) Mehlich-3 phosphorus in biosolids and (b) the molar ratio of USEPA 3050 phosphorus to [Al + Fe] in biosolids and the changes in iron-oxide strip–extractable phosphorus (FeO-P), normalized per 100 kg P/ha added, in the Elkton and Suffolk soils during the incubation study.

View larger version (30K): [in a new window]   Fig. 5. Relationship between (a) Mehlich-3 phosphorus in biosolids and (b) the molar ratio of USEPA 3050 phosphorus to [Al + Fe] in biosolids and the changes in Mehlich-1 phosphorus, normalized per 100 kg P/ha added, in the Elkton silt loam and Suffolk sandy loam soils during the incubation study.