Soil amendments Cycling 2 Fertilizers and other Amendments 2 Soil Fertility 2 Soil fertility 2 Sustainable agriculture 2 Carbon 1 Carbon sequestration 1 Charcoal 1 Chemical composition 1 Compost 1 Composting 1 Composts 1 Crop protection technologies 1 Environmental management 1 Human Wastes and Refuse 1 Humus 1 Litter (plant) 1 Manures 1 Moisture analysis 1 Nitrogen 1 Nutrient availability 1 Organic amendments 1 Organic matter 1 Organic wastes 1 Plant residues 1 Rhizosphere 1 Social Psychology and Social Anthropology, (New March 2000) 1 Soil Biology 1 Soil Chemistry and Mineralogy 1