Molecular tool for tracking micro-organisms in the environment; horizontal gene transfer among bacteria in soil by natural genetic transformation; introduction of rhizobia into soils - problems, achievements and prospects for the future; the contribution of N2-fixing trees to soil productivity and rehabilitation in tropical, subtropical and Mediterranean regions; variability in casuarina-frankia symbiosis; recent advances in frankia physiology and biochemistry with notes on their practical implications; the biotechnology of mycorrhizas; denitrification in soils and its impact on soil fertility and environmental quality; the potential of natural and genetically engineered fluorescentpseudomonas spp. as biological control agents; biological amelioration of salt affected soils; bioremediation of contaminated soils - factors influencing the biological process; microbiology of rice soils with special reference to pesticide biodegradation and greenhouse gas emissions.
