Tuesday, 8 November 2005
17
Tillage and Rotation Induced Differences in Soil Organic Matter Content and Quality Measured by Several Methods.
Anita Gal1, Peter Hegymegi1, Erika Micheli1, Cliff Johnston2, and Tony J. Vyn3. (1) Szent Istvan University, Soil Science and Agrochemistry Department, Pater K. u. 1., Godollo, 2103, Hungary, (2) Purdue University, Department of Agronomy, West Lafayette, IN 47907-2054, (3) Purdue University, Agronomy Department, 915 W. State Str., West Lafayette, IN 47907-1150
The purpose of the study was to assess the consequences of long-term (28-years) tillage and crop rotation systems on soil organic carbon sequestration with special emphasis on the most stable organic matter fraction, the humic substances. Organic carbon (OC) content of composite soil samples was determined by dry combustion (LECO CHN analyzer), by wet combustion (Walkley-Black method), by loss on ignition and by FTIR (Fourier Transform Infrared Spectroscopy). The molecular composition of the fractionated humic and fulvic acids was characterized by FTIR.
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