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Wet Chemical and Phosphorus-31 Nuclear Magnetic Resonance Analysis of Phosphorus Speciation in a Sandy Soil Receiving Long-Term Fertilizer or Animal Manure Applications
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Wet Chemical and Phosphorus-31 Nuclear Magnetic Resonance Analysis of Phosphorus Speciation in a Sandy Soil Receiving Long-Term Fertilizer or Animal Manure Applications
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Journal Article
Wet Chemical and Phosphorus-31 Nuclear Magnetic Resonance Analysis of Phosphorus Speciation in a Sandy Soil Receiving Long-Term Fertilizer or Animal Manure Applications
2003
Overview
In areas under intensive livestock farming and with high application rates of animal manure, inorganic and organic phosphorus (P) may be leached from soils. Since the contribution of these P compounds to P leaching may differ, it is important to determine the speciation of P in these soils. We determined the effect of various fertilization regimes on the P speciation in NaOH–Na2EDTA (ethylenediaminetetraacetic acid) and water extracts of acidic sandy soil samples from the top 5 cm of grassland with wet chemical analysis and 31P nuclear magnetic resonance (NMR) spectroscopy. These soils had been treated for a period of 11 years with no fertilizer (control), N (no P application), N–P–K, or different animal manures. Inorganic P was highly elevated in the NaOH–Na2EDTA extracts of the soils amended with N–P–K or animal manures, while organic P increased only in the soil treated with pig slurry. Water-extractable P showed a similar trend. As indicated by 31P NMR, orthophosphate monoesters were the main organic P compounds in all soils. Our results suggest that long-term applications of large amounts of P fertilizer and animal manures caused an accumulation of inorganic P, resulting in an increase of the potential risk related to mobilization of inorganic P in the top 5 cm of these soils.
Publisher
Crop Science Society of America,American Society of Agronomy
Subject
/ Agronomy. Soil science and plant productions
/ Animals
/ Biological and medical sciences
/ Biological and physicochemical properties of pollutants. Interaction in the soil
/ Chelating Agents - chemistry
/ Engineering and environment geology. Geothermics
/ Exact sciences and technology
/ forms
/ fosfor
/ Fundamental and applied biological sciences. Psychology
/ kernmagnetische resonantiespectroscopie
/ Leaching
/ Magnetic Resonance Spectroscopy
/ Manure
/ NMR
/ nuclear magnetic resonance spectroscopy
/ p-31 nmr
/ Phosphorus Isotopes - analysis
/ Pollution, environment geology
/ Slurries
/ Soil
/ Soil and sediments pollution
/ Swine
