clay mineralogyclay skinsclayeyclayey skeletalclaypanclean tillageclear watercleavgeclimatic indexclimaxclimosequenceclodclose deainclose packed granular fabricclose packing fabriccoagulationcoarsecoarse chertycoarse fragmentscoarse gravellycoarse sandcoarse sandy loamcoarse texturecoastal plaincoatingcobblescobblestonecobblycodcoefficient of linear extensibilitycohesioncolecoliformcolloidcolloidal suspensioncolluvialcolluviumcolonizationcolorcolorimetric methodcolumnar soil structurecombined tillage operationcombo layercometabolismcommensalismcommunitycompactioncompetencecompetitioncomplete tillage