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1、UnitedStatesDepartmentofAgricultureKeystoSoilTaxonomyNinthEdition,2003KeystoSoilTaxonomyBySoilSurveyStaffUnitedStatesDepartmentofAgricultureNaturalResourcesConservationServiceNinthEdition,2003TheUnitedStatesDepartmentofAgriculture(USDA)prohibitsdiscriminationinallitsprogramsandactivitiesontheba
2、sisofrace,color,nationalorigin,gender,religion,age,disability,politicalbeliefs,sexualorientation,andmaritalorfamilystatus.(Notallprohibitedbasesapplytoallprograms.)Personswithdisabilitieswhorequirealternativemeansforcommunicationofprograminformation(Braille,largeprint,audiotape,etc.)shouldconta
3、ctUSDA’sTARGETCenterat202-720-2600(voiceandTDD).Tofileacomplaintofdiscrimination,writeUSDA,Director,OfficeofCivilRights,Room326W,WhittenBuilding,14thandIndependenceAvenue,SW,Washington,DC20250-9410,orcall202-720-5964(voiceandTDD).USDAisanequalopportunityproviderandemployer.Cover:Anatrichorizonw
4、ithcolumnarstructureinaNatrudollfromArgentina.5TableofContentsForeword....................................................................................................................................7Chapter1:TheSoilsThatWeClassify.............................................................
5、.....................9Chapter2:DifferentiaeforMineralSoilsandOrganicSoils...............................................11Chapter3:HorizonsandCharacteristicsDiagnosticfortheHigherCategories..................13Chapter4:IdentificationoftheTaxonomicClassofaSoil.....................................
6、............37Chapter5:Alfisols...............................................................................................................41Chapter6:Andisols.............................................................................................................83Chapter7:Aridisols.....
7、......................................................................................................103Chapter8:Entisols............................................................................................................
