Neutral Ammonium Citrate Extraction of Biosolids Phosphorus
| Autor: | George A. O'Connor, R. C. Brandt, H. A. Elliot, J. M. Potter, Jihoon Kang |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Biosolids
biology Chemistry Phosphorus Extraction (chemistry) Soil Science chemistry.chemical_element engineering.material biology.organism_classification chemistry.chemical_compound Agronomy Environmental chemistry Soil water engineering Ammonium Fertilizer Agronomy and Crop Science Paspalum notatum Sludge |
| Zdroj: | Communications in Soil Science and Plant Analysis. 36:2447-2459 |
| ISSN: | 1532-2416 0010-3624 |
| Popis: | Matching biosolids application rates to crop phosphorus (P) needs requires quantifying the P fertilizer replacement value of biosolids. Neutral ammonium citrate (NAC) extraction of P, used for assessing available P in mineral fertilizers, was evaluated for 35 different biosolids. Biosolids NAC‐P was not statistically different (p=0.05) from total P using strong acid digestion (EPA 3051‐P). High P recovery by NAC was attributed to dissolution of P‐containing iron (Fe)/aluminum (Al) oxides under the aggressive extracting conditions (0.88 M citrate at 65°C). Citrate effectively dissolves P‐binding Fe/Al hydrous oxides, the very components that reduce phytoavailability when biosolids are land applied. Greenhouse studies with pasture grass (Paspalum notatum Flugge) grown in P‐deficient soils amended with biosolids revealed P phytoavailability was not correlated (r2=0.10) with biosolids NAC‐P. Phytoavailability was inversely correlated (r2=0.66) with biosolids total Al+Fe content. The NAC extraction, d... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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