Soil & Water Res., 2007, 2(4):141-148 | DOI: 10.17221/2111-SWR

Phosphorus fractions in arable and mountain soils and their humic acidsOriginal Paper

Gabriela Barančíková1, Tibor Liptaj2, Nadežda Prónayová2
1 Soil Science and Conservation Research Institute in Bratislava, regional station Prešov, Slovak Republic
2 Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Bratislava, Slovak Republic

Soil phosphorus (P) can exist in various inorganic (Pi) and organic forms (Po). Specific determination of Pi can be obtained by fractionate methods. However, the discrimination between the chemically different forms of Po in soil is not simple. Nowadays, the method of choice for the determination of various soil inorganic and organic P compounds is 31P NMR. In this paper, the determination of various phosphorus forms (available P, total P, Pi and Po fractions) in arable and mountain soils is presented. Besides, the detailed characterisation of P compounds in humic acids (HA) is also shown. The results obtained show that the highest content of the available P can be found in arable soils with a high input of fertilisers, and that the predominant part of Pi is included in hardly soluble fractions, mainly in the soil types with neutral soil reaction. Our data also show the correlation between total P and Po, the dominant form of P in the topsoil of mountain soils. Phosphomonoesters represent the major types of P in HA structure. The correlations between phosphomonoesters of type I and some humification parameters of HA and qualitative parameters of soil organic matter suggest that higher amounts of more recalcitrant monoesters can be found in more mature soil organic matter with a higher humification degree.

Keywords: inorganic P; organic P; soil types; humic acids; 31P NMR

Published: December 31, 2007  Show citation

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Barančíková G, Liptaj T, Prónayová N. Phosphorus fractions in arable and mountain soils and their humic acids. Soil & Water Res. 2007;2(4):141-148. doi: 10.17221/2111-SWR.
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