Table of Contents

Modelling plant and crop growth. LEACHB - A root-zone solute transport model describing population dynamics. Modelling microbial interactions in soil: preliminary considerations and approaches. Population dynamics of micro-organisms with different life strategies. Plasmid biology and risk assessment: elements for modelling approach of plasmid-mediated gene release in soil environments. Potential for gene exchange in the photosphere: isolation and characterisation of naturally occurring plasmids. Evaluation of methods for detecting ecological effects from genetically engineered micro-organisms and microbial pest control agents in terrestrial systems. Micro-organism sampling - can we detect differences? Risk assessment. Appendix.