7277: Putsningens påverkan på N2-fixering, rhizodeposition, växtmaterialkvalitet och nedbrytning av leguminoser [The effect of cuttings on nitrogen fixation, rhizodeposition, plant material quality and decomposition of legumes]
{PROJECT} Putsningens påverkan på N2-fixering, rhizodeposition, växtmaterialkvalitet och nedbrytning av leguminoser [The effect of cuttings on nitrogen fixation, rhizodeposition, plant material quality and decomposition of legumes]. Runs 01 January 2002 - 31 December 2004. Project leader(s): Dahlin, Sigrun, Swedish University of Agricultural Sciences, SLU.
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Summary
För att kunna bedöma ett odlingssystems effektivitet och miljöpåverkan krävs bland annat tillförlitliga N-balanser. Baljväxternas totala N-bidrag genom N2-fixering, inklusive N i rötter och rhizodeposition (dvs. N som avges från rotsystemet, döda rötter och rotdelar), är dock föga känt. I N-balanser utesluts det därför ofta, eller ersätts med grova schabloner baserade på ovanjordisk biomassa, vilket kan leda till stora fel i N-balanserna. Projektet syftar till att i modellförsök klargöra N2-fixeringens och rhizodepositionens omfattning och betydelse, samt hur dessa påverkas av putsning.
Additional Summary
In order that the effectiveness and environmental impact of a cultivation system may be assessed, reliable nitrogen balances must be available. But the total nitrogen contribution of leguminous plants through nitrogen fixation and rhizodeposition (release from the root system) is largely unknown. Nitrogen fixation and rhizodeposition are therefore often omitted from nitrogen balances, or replaced by rough conventional estimates, which may lead to the wrong conclusion. The project shall, in model experiments, clarify the scope and importance of nitrogen fixation and rhizodeposition, and the way these are affected by cuttings i.e. when the crop is cut to impede the growth of weeds. The researchers shall also investigate how weeding affects the quality of the plant material and the supply of nitrogen to the next crop when leguminous plants are broken down.
| Keywords: | model experiment, weeding |
|---|---|
| Subject Areas: | Soil > Nutrient turnover |
| Research affiliation: | Sweden > University SLU > Soil Sciences |
| Project ID: | 2001-1926 |
| Location: | Department of Soil Siences P.O. Box 7014 SE-750 07 Uppsala Sigrun.Dahlin@mv.slu.se |
| Start Date: | 01 January 2002 |
| End Date: | 31 December 2004 |
| Research Programmes and Funders: | Sweden > Formas Sweden > University SLU > Ekoforsk |
| Total budget (Euro): | 313734 |
| Orgprints ID Number: | 7277 |
| Contact: | Alm, Informant Jessica |
| Deposited On: | 19 April 2007 |
| EPrint Type: | Project description |
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