Soil and Soil Fertility Management Research in Sub-Saharan Africa: Fifty years of shifting visions a

<p><i>Advances in Agronomy </i>continues to be recognized as a leading reference and a first-rate source of the latest research in agronomy. Major reviews deal with the current topics of interest to agronomists, as well as crop and soil scientists. As always, the subjects covered are varied and exemplary of the myriad subject matter dealt with by this long-running serial. Editor <i>Donald Sparks</i>, former president of the Soil Science Society of America and current president of the International Union of Soil Science, is the <i>S. Hallock</i> du Pont Chair of Plant and Soil Sciences at The University of Delaware.</p> <p>Volume 82 contains eight state-of-the-art reviews on topics of interest in the plant and soil sciences. Three of the reviews present cutting-edge molecular scale techniques and approaches that directly impact food production, crop improvement, and environmental quality and sustainability.</p>

<p>Volume 88 of <i>Advances in Agronomy</i> contains eight timely reviews on topics dealing with biodiversity, carbon sequestration, crop improvement, nitrogen dynamics, and the discipline of soil science. Discussions include but are not limited to: Agriculture, soil biodiversity, climate change and agricultural diversity&#x3b; ways to improve soil aeration, oxygation and plant processes, and oxygation scenarios&#x3b; and pre-sowing seed treatment as a means for improving germination, plant growth and crop yield.</p> <p><i>Advances in Agronomy</i> continues to be recognized as a leading reference and a first-rate source for the latest research in agronomy. As always, the subjects covered are varied and exemplary of the myraid of subject matter dealt with by this long-running serial.</p>

Yiqi, Luo

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<i>Geomorphometry </i>is the science of quantitative land-surface analysis. It draws upon mathematical, statistical, and image-processing techniques to quantify the shape of earth's topography at various spatial scales. The focus of geomorphometry is the calculation of surface-form measures (land-surface parameters) and features (objects), which may be used to improve the mapping and modelling of landforms to assist in the evaluation of soils, vegetation, land use, natural hazards, and other information. <p/>This book provides a practical guide to preparing Digital Elevation Models (DEM) for analysis and extracting land-surface parameters and objects from DEMs through a variety of software. It further offers detailed instructions on applying parameters and objects in soil, agricultural, environmental and earth sciences. This is a manual of state-of-the-art methods to serve the various researchers who use geomorphometry. <p/>Soil scientists will use this book to further learn the methods for classifying and measuring the chemical, biological, and fertility properties of soils and gain a further understaing of the role of soil as a natural resource. Geologists will find value in the instruction this book provides for measuring the physical features of the soil such as elevation, porosity, and structure which geologists use to predict natural disasters such as earthquakes, volcanoes, and flooding.

Nitrogen is one of the most critical elements for all life forms. In agricultural systems it is essential for the production of crops for feed, food, and fiber. The ever-increasing world population requires increasing use of nitrogen in agriculture to supply human needs for dietary protein. Worldwide demand for nitrogen will increase as a direct response to increasing population. <b>Nitrogen in the Environment</b> provides a wholistic perspective and comprehensive treatment of nitrogen. The scope of this book is diverse covering a range of topics and issues related to furthering our understanding of nitrogen in the environment at farm and national levels. Issues of nitrogen from its effects on crops and human nutrition to nitrogen in ground water, watersheds, streams, rivers, and coastal marine environments are discussed to provide a broad view of the problem and support scientists, researchers, and engineers in formulating comprehensive solutions.