Recommended by users for its clear explanations and readability. Troeh and Thompson's Soil; and Soil Fertility provides and excellent overview of soils for students in agriculture and the environmental sciences. Now in its sixth edition, this book has been updated throughout and incorporates discussions of GIS (geographic information system) and GPS (global positioning system), humus and its function in soil structure and fertility, soil reclamation for sites contaminated by pesticides or petroleum spills, and advances in the understanding of water flow. In addition a new chapter on soil...