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Long-term tillage effects on the distribution of P fractions of German loess soils

Piegholdt, Christiane and Geissler, Daniel and Koch, Heinz-Josef and Ludwig, Bernard (2011) Long-term tillage effects on the distribution of P fractions of German loess soils. In: Böden verstehen - Böden nutzen - Böden fit machen, 3. - 9. September 2011, Berlin.

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Abstract

Different tillage systems may effect P dynamics in soils due to differently distributed plant residues, different aggregate dynamics and erosion losses. Objectives were to investigate the effect of tillage in a long-term field trial, initiated from 1990 to 1997 on the availability of P at four research sites. The treatments were no-till (NT) without cultivation and conventional tillage (mouldboard ploughing down to 25-30 cm, CT) on loess soils. Soil P was divided into pools of different availabilities by a sequential extraction. The Pt content (792 mg kg-1 soil) in the topsoil of NT was 15% higher compared to CT, while with increasing depth the Pt concentration decreased more under NT than under CT. Oxalate extractable iron and organic carbon were well related to the labile Pi fractions, while there was a high correlation of the stable fractions with the clay contents and pH. The higher P concentrations in the topsoil of NT resulted presumably from the shallower incorporation of root and harvest residues and erosion compared to CT.

Item Type: Conference or Workshop Item (Contribution to "Reports of the DBG")
Uncontrolled Keywords: P fractionation, conventional tillage, no-till, inorganic and organic P pools, P stocks
Divisions: Kommissionen > Kommission II: Bodenchemie
Depositing User: Christiane Piegholdt
Date Deposited: 31 Oct 2011 15:45
Last Modified: 13 Dec 2015 16:27
URI: http://eprints.dbges.de/id/eprint/785

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