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The United States Department of Agriculture (USDA) defines soil health as the continued capacity of soil to function as a vital living ecosystem that sustains plants, animals, and humans, and healthy soil gives us clean air and water. Nitrogen is indispensable to support life on earth, including for food production, but it also causes environmental problems such as global warming and groundwater pollution. This book brings together novel aspects of soil nitrogen research that solve these problems, with a particular focus on soil health in intensive agricultural systems. The two main sections...