Soil biology Soil chemistry 4 Soil physics 3 Soil Biology 2 Soil Chemistry and Mineralogy 2 Soil fauna 2 Soil flora 2 Soil mineralogy 2 Soil organic matter 2 soil science 2 Animal Ecology 1 Biodegradation 1 Biological activity in soil 1 Carbon 1 Carbon sequestration 1 Chemical composition 1 Components of soil 1 Cycling 1 Decomposition 1 Fertilizers and other Amendments 1 Food webs 1 Fungi 1 Fungi soil 1 Humus 1 Litter (plant) 1 Manures 1 Microbial Ecology, (New March 2000) 1 Microbial degradation 1 Mineralization 1 Nitrogen 1