Measuring and modeling alachlor dissipation in soil

vi GENERAL INTRODUCTION 1 Dissertation organization 1 Literature review 1 Groundwater contamination by pesticides 1 Pathways for pesticide dissipation 2 Environmental factors controlKng pesticide dissipation 3 Chemical properties controlling alachlor dissipation 6 Empirical models of pesticide dissipation 12 Mechanistic models of pesticide dissipation 13 Hybrid models of pesticide dissipation 15 Extracting and encasing large-diameter soil columns 16 Research goals 18 ALACHLOR DISSIPATION IN SHALLOW CROPLAND SOIL 19 Abstract 19 Introduction 20 Overall dissipation 20 Volatilization 20 Microbial degradation and sorption 22 Leaching and surface-water nmoff 23 Goals of study 24 Materials and methods 24 Field sampling experiment 25 Laboratory column experiment 28

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