Historical; The microbiological population of the soil as a whole; Occurrence of specific microorganisms in the soil; Decomposition of plant and animal residues in soils and in composts; Humus: nature and formation; Decomposition of soil organic matter and evolution of carbon dioxide; Transformation of nitrogen in soil; nitrate formation and nitrate reduction; Nitrogen fixation - nonsymbiotic and symbiotic; Transformation of mineral substances in soil by microorganisms; Higher plants and soil microorganisms; Associative and antagonistic effects of soil microorganisms; Disease-producing microorganisms in the soil and their control; Stable manures, composts, and green manures; Microorganisms and soil fertility; Recent developments in soil microbiology.

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