Sugar beet rotation effects on soil organic matter and calculated humus balance in Central Germany |
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| Institution: | 1. Department of Agronomy and Organic Farming, Martin Luther University Halle-Wittenberg, Betty-Heimann-Str. 5, 06120 Halle/Saale, Germany;2. Institute of Sugar Beet Research, Holtenser Landstrasse 77, 37079, Göttingen, Germany;1. Facultad de Ciencias Agropecuarias, Universidad Nacional de Entre Ríos. Ruta 11. Km 10, 5 (3100), Paraná, Argentina;2. INTA EEA Paraná, Ruta 11, Km 12, 5 (3100), Paraná, Argentina;3. CONICET, Argentina;4. IFEVA/Facultad de Agronomía, Universidad de Buenos Aires, CONICET, Av. San Martín 4453, Bs. As., Argentina;1. Laboratory of Food Chemistry, Wageningen University, P.O. Box 17, 6700AA Wageningen, The Netherlands;2. Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600MB Eindhoven, The Netherlands;3. Department of Production Engineering, Bremen University, 28359 Bremen, Germany;4. Cosun Food Technology Centre, Oostelijke Havendijk 15, 4704RA Roosendaal, The Netherlands;1. College of Agronomy, State Key Laboratory of Crop Biology, Shandong Key Laboratory of Crop Biology, Shandong Agricultural University, Tai’an, Shandong, PR China;2. Carbon Management and Sequestration Center, School of Environment and Natural Resources, The Ohio State University, Columbus, OH, USA;1. INRA, UMR AGIR 1248, 24 Chemin de Borde Rouge—Auzeville, CS 52627, 31326 Castanet Tolosan Cedex, France;2. Institut de Recherche pour le Développement, UMR DIADE, 911 Avenue Agropolis, 34394 Montpellier Cedex 5, France;1. Institut für Bodenkunde, Universität Hamburg, Allende-Platz 2, 20146 Hamburg, Germany;2. Landesamt für Landwirtschaft, Umwelt und ländliche Räume, Hamburger Chaussee 25, 24220 Flintbek, Germany |
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| Abstract: | In order to quantify the influence of land use systems on the level of soil organic matter (SOM) to develop recommendations, long-term field studies are essential. Based on a crop rotation experiment which commenced in 1970, this paper investigated the impact of crop rotations involving increased proportions of sugar beet on SOM content. To this end, soil samples were taken in 2010 and 2012 from the following crop rotation sequences: sugar beet–sugar beet–winter wheat–winter wheat (SB–SB–WW–WW = 50%), sugar beet–sugar beet–sugar beet–winter wheat (SB–SB–SB–WW = 75%), sugar beet–grain maize (SB–GM = 50%) and sugar beet-monoculture (SB = 100%); these were analysed in terms of total organic carbon (TOC) and microbial biomass carbon (MBC) content, MBC/TOC ratio and the TOC stocks per hectare. In addition, humus balances were created (using the software REPRO, reference period 12 years) in order to calculate how well the soil was supplied with organic matter. In the field experiment, harvest by-products (WW and GM straw as well as SB leaves) were removed. After 41 years, no statistically significant differences were measured between the crop rotations for the parameters TOC, MBC, MBC/TOC ratio and the TOC stock per hectare. However, the calculated humus balance was significantly affected by the crop rotation. The calculated humus balance became increasingly negative in the order SB–SB–WW–WW, SB–SB–SB–WW, SB monoculture and SB–GM, and correlated with the soil parameters. The calculated humus balances for the reference period did not reflect the actual demand for organic matter by the crop rotations, but instead overestimated it. |
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| Keywords: | Total organic carbon Microbial biomass carbon REPRO Humus unit Long-term field trial Chernozem |
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