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RESEARCH ARTICLE

KMnO4 determination of active carbon for laboratory routines: three long-term field experiments in Austria

M. Tatzber A B C D , N. Schlatter A , A. Baumgarten A , G. Dersch A , R. Körner A , T. Lehtinen A , G. Unger A , E. Mifek A and H. Spiegel A
+ Author Affiliations
- Author Affiliations

A Department for Soil Health and Plant Nutrition, Institute for Sustainable Plant Production, Austrian Agency for Health and Food Safety (AGES), Spargelfeldstraße 191, 1220 Vienna, Austria.

B Unit of Soil Ecology, Institute of Forest Ecology and Soils, Federal Research and Training Centre for Forests, Natural Hazards and Landscape (BFW), Seckendorff-Gudent Weg 8, A-1131 Vienna, Austria.

C Division of Radiation Protection, Austrian Agency for Health and Food Safety (AGES), Spargelfeldstraße 191, 1220 Vienna, Austria.

D Corresponding author. Email: michael.tatzber@ages.at; michael.tatzber@gmx.at

Soil Research 53(2) 190-204 https://doi.org/10.1071/SR14200
Submitted: 23 November 2013  Accepted: 22 October 2014   Published: 25 February 2015

Abstract

Recent studies show that a labile soil carbon (C) fraction determined with potassium permanganate (KMnO4) reflects the type of soil management. The present study combines the method for determining the active C (AC) pool with an alternative titration of the 0.02 m KMnO4 solution with sodium oxalate (Na2C2O4) for routine laboratory analyses. Three long-term field experiments investigated: (i) different cropping systems and 14C-labelled organic amendments, (ii) three different tillage systems, and (iii) the application of four different kinds of compost. The results showed the depletion of AC in the permanent bare-fallow system of the 14C-labelled field experiment. When calculating the ratio AC/total organic C (TOC), the depletion of the AC/TOC curve reflected a priming effect, in accord with previous work. We obtained significant positive correlations of AC with TOC, total nitrogen (Nt), humic acid-C and remaining 14C-labelled material. The AC in the tillage systems experiment was significantly (P < 0.05) different between all three tillage treatments at 0–10 cm depth, and the ratio AC/TOC also revealed a significant difference between minimum and conventional tillage treatments at 10–20 cm. For the compost field experiment, significant differences occurred between plots fertilised solely with N and plots receiving organic amendments. The AC/TOC ratio of the sewage sludge amendment was significantly lower than in all other systems. Correlations of AC with TOC for all samples of the different long-term field experiments revealed different behaviours in different soil types. The correlations of AC with Nt showed higher coefficients than with TOC. The applied methodology has a potential for sensitive and reliable detections of differences in soil organic matter characteristics.

Additional keywords: 14C label, compost, cropping systems, SOM, tillage systems, titration.


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