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 Columbia Plateau Conservation Research Center: Pendleton, OR
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Title:   Author  item
                                            Albrecht, Stephanitem
                                            RASMUSSEN, PAUL - RETIRED USDA-ARSitem
                                            DOUGLAS, JR, CLYDE - RETIRED USDA-ARSitem
                                            RICKMAN, RONALD - RETIRED USDA-ARSitem
                                            SMILEY, RICHARD - OREGON STATE UNIVitem
                                            Wuest, Stewartitem
                                            PAYNE, WILLIAM - OREGON STATE UNIVitem
                                            Wilkins, Dale
  Submitted to: Agronomy Abstracts
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 8/1/1999
                                    Publication  Date: N/A
                                    Citation: N/AInterpretive Summary:
                                Technical Abstract: Long-term cropping system research helps determine management effects on soil organic matter.  The trends in soil C content at multiple depths in several long-term management systems on a Walla Walla silt loam near Pendleton, OR were examined and compared for C sequestration.  A continuing decline of C over time was found as deep as 60 cm in systems  that included burning, plowing, or fallow in the rotation.  A rotation with manure applied at 2.24 Mg per ha per crop year had no decline in soil C.  Soil C content was positively correlated with residue returned to the soil, which in turn was dependent upon fertility and organic amendments. Annual cropping provided improved C retention compared to fallow, and permanent pasture retained more C than any cultivated practice. Management systems that increase residue input to the soil, or decrease microbial oxidation of crop residues and soil carbon, increase the  potential to sequester C in semi-arid agroecosystems.


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