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1、CSIROPUBLISHINGSoilResearch,2016,54,880–888http://dx.doi.org/10.1071/SR15153Theinfluenceofsurfactantandorganicmattercontentonwettingpatternofdifferentnon-waterrepellentsoilsA,DAB,CMohammadRezaChaichi,MarcusTurcios,andMinaRostamzaADepartmentofPlantandSoilSciences,CollegeofAgricul
2、ture,CaliforniaStatePolytechnicUniversity,Pomona,California91709,USA.BAgriculturalResearchInstitute,IranianResearchOrganisationforScienceandTechnology(IROST),Tehran3353136846,Iran.CDepartmentofAgronomy,PurdueUniversity,915WestStateStreet,WestLafayette,IN47907,USA.DCorresponding
3、author.Email:mrchaichi@cpp.eduAbstract.Non-ionicsurfactantshavebeenwellresearchedasatooltoamelioratewaterrepellentconditions.However,fewstudieshaveevaluatedtherisksandbenefitsofnon-ionicsurfactantapplicationsinwettablesoil.Theobjectiveofthisstudywastoevaluatetheeffectsofasurfact
4、antinmodifyingthewettingpatterninsoilsofdifferenttexturesandorganicmattercontents.Theexperimentaltreatmentsconsistedof(1)fourdifferentsoiltexturesincludingsandy,sandyloam,sandyclayloamandsiltloam,(2)fourdifferentorganicmattercontents(0.2,0.7,1.2and1.7%byweight),and(3)irrigation
5、watertreatmentswithorwithoutsurfactant(IrrigAidGold).TheexperimentwascarriedoutinPlexiglasboxeswithonedripemitterunderthesoilsurface.Theresultsdemonstratedthesuperiorityofsurfactantapplicationonincreasingwaterdistributioninthesoilprofileforallsoiltexturalclasses.Siltloamtextureh
6、adthehighestsidewettedareaandwettingdepth45minaftertheinitiationofirrigation.Upwardcapillarywatermovementandtopwettedareasignificantlydecreasedinthesurfactanttreatmentacrossallsoiltexturesexceptinsandysoil.Asorganicmattercontentincreased,topwettedareadecreased.Thesefindingsclarifi
7、edthepotentialabilityofsurfactantinincreasingwaterinfiltrationinnon-repellentsoilinaninvitrosystem.Additionalkeywords:soilmoisture,soiltextures,waterinfiltration,wettedarea,wettingdepth.Received21November2014,accepted30September2015,publishedonline5September2016Introductionslakin
8、g(Sullivan1990).ThesecondOMbehaviourinthesoilWettabili
