SPADA Docs

North Dakota State U.

https://www.ndsu.edu/soils/

Soil testing laboratory Soil fertility laboratory Soil testing laboratory

Ohio State U.

https://senr.osu.edu http://pss.okstate.edu

Oklahoma State U. Pennsylvania State U.

https://ecosystems.psu.edu/graduateprograms/soil- science

Soil testing laboratory https://agsci.psu.edu/aasl/s oil-testing

Southern Illinois U. - Carbondale

https://coas.siu.edu/academics/departments/plant-soil- agricultural-systems/index.html

Texas Tech U. U. of Arizona U. of Delaware U. of Florida U. of Kentucky U. of Maryland U. of Wiconsin - Madison

http://www.depts.ttu.edu/pss/index.php https://swes.cals.arizona.edu/home

https://canr.udel.edu/plsc/ https://soils.ifas.ufl.edu

Soil testing laboratory Soil testing laboratory Soil testing laboratory

http://pss.ca.uky.edu https://enst.umd.edu https://soils.wisc.edu

Utah State U.

https://psc.usu.edu

Non-academic resources

Biological, genomic, and geological archival samples

National Ecological Observatory Network (NEON)

https://www.neonscience.org/data/neon- biorepository/archival-samples-catalog

International Soil Carbon Network

https://iscn.fluxdata.org/data/contribute-data/soil- archive-survey/

Information gathering on archived soils Directory of soil laboratories, methods, and other resources

https://iscn.fluxdata.org/resources/overview/

USDA NRCS b

https://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/c ontactus/?cid=nrcs142p2_053951

Directory of state soil scientists

https://websoilsurvey.nrcs.usda.gov/app/

Web soil survey

Soil Science Society of America Critical Zone Exploration Network and Critical Zone Observatories

International scientific society Compilation of Datasets

https://www.soils.org

http://criticalzone.org/national/about/partner/critica l-zone-exploration-network/ 520 b USDA NRCS = U.S. Department of Agriculture Natural Resources Conservation Service a All websites accessed 15-Apr-2019.

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9.2 Standard Reference Material Resource

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