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1、PublishedMay,1996TestingaNewProcedureforMeasuringWater-StableAggregationE.Amezketa,M.J.Singer,*andY.LeBissonnaisABSTRACTtiessuchastexture(Romkensetal.,1977;TrottandAggregatestabilityisanimportantbutdifficultsoilpropertytoSinger,1983;MeyerandHarmon,1984;Bradfordetquantifyandinterpret.Numerous
2、methodshavebeenusedtodeter-al.,1987),thepercentageofFeandAlextractablewithmineaggregatestabilitywithvaryingsuccess.Thiscomplicatesthecitrate-bicarbonate-dithionite(Romkensetal,1977;comparisonamongaggregatestabilitydata.ItisalsodifficulttoobtainTrottandSinger,1983)exchangeableCaorsumofaconsis
3、tentcorrelationbetweenaggregatestabilityandotherimpor-exchangeablebases(MeyerandHarmon,1984),organictantsoilpropertiessuchassoilcredibilityorcrustingpotential.Thematter(MeyerandHarmon,1984)andsoildispersabilityobjectiveofthisstudywastocomparethestandardKemperand(MillerandBaharuddin,1986;Shai
4、nbergetal.,1992)Rosenaumethodformeasuringwater-stableaggregates(WSA)withhavestatisticallysignificantrelationshipswithsoilerod-anewtechnique,andcorrelatetheerosiveandcrustingbehaviorofibility.Measurementsofsoilaggregatestabilityhave10newCaliforniasoilstotheaggregatestabilitiesdeterminedbyboth
5、methods.Thenewmethodconsistsofdeterminingtheparticle-sizebeenfoundtobestronglycorrelatedwithsoilcredibility,distributionofaggregatesremainingona0.25-mm-diam.sieveaftereitherpositively(Bryan,1968;Elwell,1986;Millerandfastwetting,slowwetting,andstirringafterprewetting.InthenewBaharuddin,1987;C
6、ooteetal.,1988)ornegativelytechnique,aggregatesaresievedinalcoholinsteadofwater.Both(Bajracharyaetal.,1992).Soilaggregationhasalsostabilitytestsaresimpleandgivereproducibleestimatesofaggregatebeenshowntobecorrelatedwithsoilcredibility(Wisch-stability.Coefficientsofvariationwere<5%forbothmeth
7、ods.How-meierandMannering,1969).ever,onlythestabilityparameterslikemeanweightdiameter(MWD)Manydifferentmethodsexistformeasuringsoilaggre-forfastwettingandstirringafterprewetting,obtainedwiththenewgation;somefocusonaggregatesizedistributionandmethod
