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Soil's carbon storage capacity investigated
Date:7/28/2008

icle is available for no charge for 30 days following the date of this summary. View the abstract at:http://soil.scijournals.org/cgi/content/abstract/72/4/970

Investigation: Argentina

In the semiarid portion of the Pampas, scientist compared no-till management to a conventional tillage system (disk-tillage). Emissions of CO2-C from the soil and crop C inputs were determined, estimating soil C balance under both tillage systems.

As a part of this study, a field experiment was performed during 6 yr on an Entic Haplustoll where no-till and disk-tillage was applied to a soil cropped under a common rotation in the region (oat + hairy vetch, corn, wheat, oat). From Year 3 to 6 in situ CO2-C fluxes were measured and C inputs from above and below ground plant residues were estimated.

Results showed that in the semiarid environment of the study C sequestration occurred under no-till. The sequestration process was attributed to the effect of tillage systems on crop productivity rather than on the mineralization intensity of soil organic pools.

The full article is available for no charge for 30 days following the date of this summary. View the abstract at:http://soil.scijournals.org/cgi/content/abstract/72/4/1140

Investigation: United States

In Kentucky (USA) a study was conducted in a corn agroecosystem experiment to test the soil C saturation concept which postulates that there is an upper limit to the equilibrium soil C level of mineral soils even when soil C input is increased. In this experiment, a gradient of soil C input was produced with four N fertilizer application rates under two tillage systems, no-till and moldboard plowing. To investigate if physical protection of organic C leads to soil C saturation, C stabilization in soil fractions that differ in C st
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Contact: Sara Uttech
suttech@soils.org
608-268-4948
Soil Science Society of America
Source:Eurekalert

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