Service Description: he USDA-NRCS Soil Geochemistry Spatial Database contains data collectively produced by the National Cooperative Soil Survey Program. Sites were generally selected and sampled by soil survey personnel in respective states. Laboratory data were produced by the USDA-NRCS Kellogg Soil Survey Laboratory, located in the National Soil Survey Center, Lincoln, NE. This current version of the website was completed in August 2009 and reflects all geochemistry data produced as of that time.
The geographic display consists of two major sets of geochemistry data:
1. Current Geochemistry Project — The Soil Geochemistry Spatial Dataset is a collection of soil geochemistry data produced by the U.S. Department of Agriculture, Natural Resources Conservation Service, Kellogg Soil Survey Laboratory in Lincoln, Nebraska. The website is ongoing and updated periodically to reflect additional available data. Soil pedons were sampled and analyzed by horizons. Pedons represent either the central concept of a soil series, the central concept of a map unit, or unspecified sites on a project specific basis. Sites are indentified as either contaminated or non-contaminated (cited as “unknown”) based on knowledge of land use history. When labeled as “unknown”, it suggests the elemental concentrations represent native values. These data are represented in four layers: Site Info, Major Elements, Trace Elements, and Selected Characterization Data. Data in Major Element and Trace Element tiers are defined by specific digestion. Digestion method for elements in the “Major Elements” tier consists of an acid combination of HF+HNO3+HCL. Elements in the “Trace Elements” tier are recovered from soil with a HNO3+HCL digestion. Elemental data are incomplete on certain samples. Additional elements have been added to the analytical suite over time and certain data are absent on earlier projects. Also, certain projects were specific for only major or trace elements.
Currently, the dataset contains data for over 1,400 sites, and greater than 4,800 and 6,000 samples with trace and major elemental data, respectively. Each point or location on the map represents one or more pedons. Data for pedons generally include multiple horizons listed sequentially in a tabular format. Each location has four types of data associated: site, trace element, major element, and characterization data. For certain sites, only trace or major elemental data may be available.
The Soil Geochemistry Spatial Dataset contains data collectively produced by the National Cooperative Soil Survey Program. Sites were generally selected and sampled by soil survey personnel in respective states. Laboratory data were produced by the U.S. Department of Agriculture, Natural Resources Conservation Service, Kellogg Soil Survey Laboratory, located in the National Soil Survey Center, Lincoln, Nebraska.
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