Designation:D5268−13StandardSpecificationforTopsoilUsedforLandscapingPurposes1ThisstandardisissuedunderthefixeddesignationD5268;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisspecificationcoversaphysicalevaluationofaninorganicsoilcontainingalimitedamountoforganicmaterial,relativetoitsuseasatopsoilforhorticulturalpurposesinconstruction.Forclassification,afullagriculturaltexturalclassificationmaybeused.1.2ThepresenceinthesoilofthecorrectnutrientsandpHstatusisnecessaryforhealthyplantgrowth.Thisspecificationdoesnot,however,coveradeterminationofthenutrients,northeiravailability.2NOTE1—Thenutrientcontentoftopsoilisimportantandthenutrientsusuallyevaluatedarenitrogen,phosphate,andpotassium.Nutrientdefi-cienciesmaybecorrectedusingorganicorinorganicfertilizers.Excesssolublesaltsshouldbeexaminedastotheirdesirability.Theacidityoralkalinityofthesoilisalsoimportant.Excessaciditymaybecorrectedbytheapplicationoflime.Excessalkalinitymaybecorrectedbytheapplicationofsulfurorothersuitableacidifyingcompounds.Thelatteritem,inadditiontoloweringpH,alsocouldbeconsideredasanaggregatewhenconsideringtheparticlesizedistribution.1.3TypicalgeneralrangesofsoilcontentarepresentedinTable1.Soilsfallingwithintheserangeswillgenerallyformasuitabletopsoil.Itmust,however,berecognizedthatinsomegeographicregions,concurrencewiththevaluesofTable1wouldbemostdifficult.Insuchcases,locallyacceptablespecificationswouldneedtobedeveloped.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedD...
