Sustainability of agricultural systems is a major global concern due to population growth and a number of environmental factors. This book addresses the key to the development of sustainable agriculture-management of soil fertility. Combining data from temperate and tropical regions, it presents a complete picture of how various soils can best be managed under widely different environmental conditions.
Soil Fertility Management for Sustainable Agriculture is an excellent reference for environmental and agricultural professionals as well as a textbook for undergraduate and graduate students preparing for a career in agriculture or soil fertility management.

[This] substantial book...makes an important and stimulating contribution. MEDIEVAL ARCHAEOLOGY Warfare in Europe in the middle ages underwent a marked change of emphasis as urban life expanded. The concentration of wealth represented by a city was a valuable objective, and the static nature of a siege was infinitely preferable to the uncertainties of campaign. As the incidence of sieges increased, so pitched battles declined. The studies in this book, intended for specialists as well as general readers, follow the history of siege warfare, exploringthe urban milieu within which it developed, and the evolution of siege technology up to the advent of gunpowder weaponry. The logistics of specific sieges, from the Crusader kingdoms in the Near East and the Byzantine Empire as well as medieval Europe, are also considered, with evidence from literature, engineering, architecture and cliometrics. IVY CORFIS is professor in the department of Spanish and Portuguese at the University of Wisconsin, Madison; MICHAEL WOLFE is professor in the department of history at Penn State University, Altoona. Contributors: MICHAEL WOLFE, JAMES F. POWERS, MICHAEL TOCH, DENYS PRINGLE, ERIC McGEER, PAUL E. CHEVEDDEN, MICHAEL HARNEY, HEATHER ARDEN, WINTHROP WETHERBEE, KELLY DEVRIES, MICHAEL MALLETT, BERT S. HALL.