| Abstract: | Eutrophication caused by dissolved P from poultry litter (PL)-amended agricultural soils has been a serious environmental concern in the Delaware-Maryland-Virginia Peninsula (Delmarva), USA. To evaluate state and federal nutrient management strategies for reducing the environmental impact of soluble P from long-term PL-amended Delaware (DE) soils, we investigated (i) inorganic P speciation; (ii) P adsorption capacity; and (iii) the extent of P desorption. Although the electron microprobe (EMP) analyses showed a strong correlation between P and Al/Fe, crystalline Al/Fe-P precipitates were not detected by x-ray diffraction (XRD). Instead, the inorganic P fractionation analyses showed high levels of oxalate extractable P, Al, and Fe fractions (615-858, 1215-1478, and 337-752 mg kg-1, respectively), which were susceptible to slow release during the long-term (30-d) P desorption experiments at a moderately acidic soil pHwater. The labile P in the short-term (24-h) desorption studies was significantly associated with oxalate and F extractable Fe and Al, respectively. This was evident in an 80% reduction maximum in total desorbable P from NH4 oxalate/F pretreated soils. In the adsorption experiments, P was strongly retained in soils at near targeted pH of lime (???6.0), but P adsorption gradually decreased with decreasing pH near the soil pHwater (???5.0). The overall findings suggest that P losses from the can be suppressed by an increase in the P retention capacity of soils via (i) an increase in the number of lime applications to maintain soil pHwater at near targeted pH values, and/or (ii) alum/iron sulfate amendments to provide additional Al- and Fe-based adsorbents. ?? Soil Science Society of America. |
| Genre: | Article |
| ProdID: | 70031717 |
| Citation Author: | Arai, Y.; Livi, K. J. T.; Sparks, D. L. |
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| Citation End Page: | 629 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Soil Science Society of America Journal |
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| Citation Number Of Pages: | 14 |
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| Citation Search Results Text: | Phosphate reactivity in long-term poultry litter-amended southern Delaware sandy soils; 2005; Article; Journal; Soil Science Society of America Journal; Arai, Y.; Livi, K. J. T.; Sparks, D. L. |
| Citation Start Page: | 616 |
| Citation Volume: | 69 |
| Citation Year: | 2005 |
| Type: | citation/reference |
| Text: | Phosphate reactivity in long-term poultry litter-amended southern Delaware sandy soils; 2005; Article; Journal; Soil Science Society of America Journal; Arai, Y.; Livi, K. J. T.; Sparks, D. L. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.2136/sssaj2004.0218 |
| Date Other: | Sat, 1 Jan 2005 00:00 -0600 |
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