chapter 1 Significance of Soil Organic Matter to Soil Quality and Health -- chapter 2 Soil Organic Matter Management Strategies -- chapter 3 Soil Organic Matter Fractions and Their Relevance to Soil Function -- chapter 4 Stimulatory Effects of Humic Substances on Plant Growth -- chapter 5 Suppression of Soilborne Diseases in Field Agricultural Systems:Organic Matter Management, Cover Cropping, and Other Cultural Practices -- chapter 6 Contributions of Fungi to Soil Organic Matter in Agroecosystems -- chapter 7 Connecting Belowground and Aboveground Food Webs: The Role of Organic Matter in Biological Buffering -- chapter 8 Tillage and Residue Management Effects on Soil Organic Matter -- chapter 9 Strategies for Managing Soil Organic Matter to Supply Plant Nutrients -- chapter 10 Soil and Crop Management Effects on Soil Microbiology -- chapter 11 Interactions among Organic Matter, Earthworms, and Microorganisms in Promoting Plant Growth.