Soil classification
Despite these differences, in a well-constructed system, classification criteria group similar concepts so that interpretations do not vary widely.Another approach is numerical classification, also called ordination, where soil individuals are grouped by multivariate statistical methods such as cluster analysis.The USDA classification was originally developed by Guy Donald Smith, director of the U.S. Department of Agriculture's soil survey investigations.The European Union uses the World Reference Base for Soil Resources (WRB), currently the fourth edition is valid.[12] The U.S. Occupational Safety and Health Administration (OSHA) requires the classification of soils to protect workers from injury when working in excavations and trenches.Such technical classifications are developed with specific applications in mind, such as soil-water relationships, land quality assessment or geotechnical engineering.
soil typescategorizationtemple of Horus at EdfuGeotechnical engineersUnified Soil Classification SystemgravelsAtterberg limitsAASHTO Soil Classification SystemBurmisterSoil scienceclassificationsoil morphologygenesisedaphicUSDA soil taxonomyWorld Reference Base for Soil Resourcestaxonomichierarchicalordinationcluster analysissoil surveysoil formationland usesoil management1938 USDA soil taxonomyGuy Donald SmithU.S. Department of Agriculture'sLand Capability Classeshydric soilprime farmlandvernacularFolk taxonomiesOccupational Safety and Health Administrationlateral earth pressureAustralian Soil ClassificationCanadian system of soil classificationFrench soil classificationFAO soil classificationInternational Committee on Anthropogenic SoilsICOMANTHWorld Reference Base for Soil Resources (WRB)BibcodeWayback Machinesoil qualityInternational Soil Reference and Information CentreHistoryPedologyEdaphologySoil biologySoil microbiologySoil zoologySoil ecologySoil physicsSoil mechanicsSoil chemistryEnvironmental soil scienceAgricultural soil sciencePedospherePedodiversitySoil erosionSoil contaminationSoil retrogression and degradationSoil compactionSoil compaction (agriculture)Soil sealingSoil salinityAlkali soilSoil pHSoil acidificationSoil healthSoil lifeSoil biodiversitySoil valueSoil fertilitySoil resilienceSoil colorSoil textureSoil structurePore space in soilPore water pressureSoil crustSoil horizonSoil biomantleSoil carbonSoil gasSoil respirationSoil organic matterSoil moistureSoil water (retention)Soil typeAcrisolsAlisolsAndosolsAnthrosolsArenosolsCalcisolsCambisolsChernozemCryosolsDurisolsFerralsolsFluvisolsGleysolsGypsisolsHistosolKastanozemsLeptosolsLixisolsLuvisolsNitisolsPhaeozemsPlanosolsPlinthosolsPodzolsRegosolsRetisolsSolonchaksSolonetzStagnosolTechnosolsUmbrisolsVertisolsAlfisolsAndisolsAridisolsEntisols