The authors present a very readable review of the factors involved in nitrogen management. In a final summary chapter, the authors reemphasize a point that runs throughout: all the factors presented are interrelated. They urge careful consideration of conditions in an individual agricultural system to achieve responsible nitrogen management. --Choice Geochemists, especially those not well versed in farming practice, would be well advised to peruse this interesting book. Though focused on U.S. agriculture, the book deals with general agricultural chemical principles and practice, and thus helps the reader to understand the basis for traditional or scientific farming in any part of the world....I took the trouble to read this book carefully, have learned much from it, and like it....Urbanization is depriving many of us of a practical understanding of how crops are grown and how agriculture is changing as a result of new technologies and in response to newly recognized environmental constraints, Professors Rauschkolb and Hornsby...make it possible for geochemists and others to make up for this deficiency in their education if they will take time to read this book, which I recommend they do. --Geochimica et Cosmochimica Acta The book provides a useful general review . . . and should be of value to agricultural researchers and students. --The Quarterly Review of Biology