Plant Soil Environ., 2011, 57(2):88-94 | DOI: 10.17221/226/2010-PSE

Microbiological characterization of land set-aside before and after Roundup desiccation

M. Růžková1, L. Růžek2, K. Voříšek2, P. Vráblík3, D. Musilová4
1 Central Institute for Supervising and Testing in Agriculture, Brno, Czech Republic
2 Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic
3 Faculty of Environment, University of Jan Evangelista Purkyne, Ústí nad Labem, Czech Republic
4 Faculty of Science and Engineering, York University, Toronto, Ontario, Canada

Luvic chernozem (set-aside from 1996) was evaluated. The first period, before Roundup desiccation (2002-2003), was characterized by black, spontaneous and controlled fallows (mowed with the removal of plant biomass or mulched); the following period (2003-2004) by black fallow with repeated Roundup applications; and the last period (2004-2006) involved re-grassing by a mowed Lolium multiflorum Lam. monoculture. The characterization included microbial biomass, available organic carbon, basal respiration, metabolic quotient, biomass-specific available organic carbon, arylsulfatase activity, soil organic matter carbon and total nitrogen. Mulching of pure cultures of grasses and legumes contributed to a high soil organic matter accumulation. Repeated Roundup desiccation caused a strong (highly significant) decrease of arylsulfatase activity (-28%), however highly significant increase of microbial biomass (+69%) and nitrate-nitrogen (+86%) were determined. The subsequent re-grassing compensated the changes described. The soil biological properties were best preserved on mulched fallow with Lotus corniculatus L. and Festuca pratensis L., also in regard to contamination with weeds.

Keywords: fallow; microbial biomass; metabolic quotient; respiration; arylsulfatase

Published: February 28, 2011  Show citation

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Růžková M, Růžek L, Voříšek K, Vráblík P, Musilová D. Microbiological characterization of land set-aside before and after Roundup desiccation. Plant Soil Environ. 2011;57(2):88-94. doi: 10.17221/226/2010-PSE.
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