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Title:   Author  item
                                            Gollany, Heroitem
                                            ALLMARAS, R - RETIRED ARSitem
                                            Albrecht, Stephanitem
                                            Copeland, Stephenitem
                                            DOUGLAS, JR, CLYDE - RETIRED ARS
  Submitted to: Greenhouse Gas Emissions and Carbon Sequestration Symposium
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 3/11/2005
                                    Publication  Date: 3/21/2005
                                    Citation: Gollany, H.T., Allmaras, R.R., Albrecht, S.L., Copeland, S.M., Douglas, Jr, C.L. 2005. Incorporated source carbon and nitrogen fertilizer influence on sequestered carbon and soluble silica in a Pacific Northwest mollisol. Third USDA Symposium on Greenhouse Gas Emissions and Carbon Sequestration in Agriculture and Forestry. 21-24 March, 2005. p. 107.Interpretive Summary:
                                Technical Abstract: Long-term experiments are ideal for evaluating the influence of
agricultural practices on soil organic carbon (SOC) and its interaction with soil constituents. Limited research has examined influence of organic amendments on SOC and silica (Si) interaction. The objectives were to: i) determine the effect of residue management and organic amendments on SOC accretion; and ii) evaluate the influence of organic amendments on fine organic matter (FOM) distribution and interaction with soluble Si. A long-term fallow-wheat (Triticum aestivum L.) experiment with several residue management practices (NB, no burn; SB, spring burn; and FB, fall burn), three N rates (0, 45, and 90 kg N ha-1), and organic amendments (NBM, 11.2 t/ha/yr manure; and no burn pea vines, 1.12 t/ha/yr pea vines) was established on a Walla Walla silt loam (coarse-silty, mixed, superactive, mesic Typic Haploxeroll) in 1931. The experiment is an ordered block with 2 replications. Soil cores (2-cm depth increments) were used to measure coarse organic matter, FOM, pH, bulk density, water-soluble C and water-soluble Si. The SOC storage for the NBM (5.78 kg C m-2) was 25% higher than FB0(4.62 kg C m-2) at the 0-50 cm depth. Nitrogen fertilizer application decreased water-soluble Si by 17% while manure or pea vines application increased water-soluble Si by 10%. Silica solubilization and movement in response to reduced pH was greater in the absence of organic amendments. Increased SOC and associated reduction in Si solubilization suggest that biological SOC sequestration impacts siliceous pan formation and enhances drainage.


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