b horizonsbacillocylindricalbackfillbackground concentrationbackslopebackswampbacteriabacterioidbacteriophagebadlandband applicationbandingbank storagebarbar screenbasal tillbase flowbase levelbase mapbase saturationbase saturation percentagebasic cationbasic distribution patternbasic shrinkage phasebasic shrinkage zonebasinbasoidbatch culturebeccarl processbedbed loadbed plantingbeddingbedrockbench terracebenchmarkbenthicbenthosbentonitebermbioaccumulationbioassaybioavailablebiochemical oxidationbioconcentrationbiodegradablebiodegradationbiogenicbiological availabilitybiological denitrification