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| Petersen, Søren O.; Schjønning, P.; Olesen, Jørgen E.; Christensen, S.; Christensen, B.T.. |
| In organic cropping systems, legumes, cover crops, residue incorporation, and manure application are used to maintain soil fertility, but the contributions of these management practices to soil nitrogen (N) supply remain obscure. We examined potential sources of N for winter wheat (Triticum aestivum L.) in four experimental cropping systems established in 1997 on three soil types. Three of the four systems were under organic management. Topsoil N, depth of the A horizon, and cumulated inputs of N since 1997 were determined at plot level. Labile soil N pools (mineral N, potentially mineralizable N [PMN], microbial biomass N [MBN]) were monitored during two growth periods; at one site, biomass C/N ratios were also determined. Soil for labile N analysis was... |
| Tipo: Journal paper |
Palavras-chave: Crop combinations and interactions; Soil biology; Nutrient turnover; Farm nutrient management. |
| Ano: 2013 |
URL: http://orgprints.org/22015/7/22015.pdf |
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| Birkhofer, Klaus; Bezemer, TM; Bloem, J; Bonkowski , M; Christensen, S.; Dubois, David; Ekelund , F; Fließbach, Andreas; Gunst, Lucie; Hedlund , K; Mäder, Paul; Mikola , J; Robin , C; Setälä, Heikki; Tatin-Froux , F; Van der Putten , WH; Scheu, Stefan. |
| Organic farming may contribute substantially to future agricultural production worldwide by improving soil quality and pest control, thereby reducing environmental impacts of conventional farming. We investigated in a comprehensive way soil chemical, as well as below and aboveground biological parameters of two organic and two conventional wheat farming systems that primarily differed in fertilization and weed management strategies. Contrast analyses identified management related differences between “herbicide-free” bioorganic (BIOORG) and biodynamic (BIODYN) systems and conventional systems with (CONFYM) or without manure (CONMIN) and herbicide application within a long-term agricultural experiment (DOK trial, Switzerland). Soil carbon content was... |
| Tipo: Journal paper |
Palavras-chave: Soil. |
| Ano: 2008 |
URL: http://orgprints.org/26205/1/Birkhofer_etal_2008_soil.pdf |
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| Georgieva, S.; Christensen, S.; Petersen, H.; Gjelstrup, P.; Thorup-Kristensen, K.. |
| The assemblages of microbial (bacteria and fungi), microfaunal (protozoa and nematodes) and mesofaunal (microarthropods) populations were studied in decomposing root residues from hairy vetch (Vicia villosa Roth) and rye (Secale cereale L.) in a litterbag field experiment. Litterbags containing vetch or rye root residues were buried in soil at the same day as either vetch or rye winter catch crops were incorporated into the field soil from which the materials were gathered. The litterbags were sampled after 6 weeks in the field. In vetch, bacterial and fungal biomasses were similar whereas fungi dominated microbial biomass in rye. The biomass of the bacterial consuming fauna dominated by nematodes and microarthropods was similar to the biomass of bacteria... |
| Tipo: Journal paper |
Palavras-chave: Biodiversity and ecosystem services; Composting and manuring. |
| Ano: 2005 |
URL: http://orgprints.org/7900/1/7900.pdf |
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