GENERAL DESCRIPTIONWritten by international authorities in agronomy, Volume 61 contains five comprehensive reviews covering key contemporary topics on crop and soil sciences. As always, the topics are varied and exemplary of the array of subject matter covered by this long-running serial. In this volume, a definitive treatise on dynamic conservation of plant genetic resources is included, as is an environmentally timely update on coal surface mine reclamation practices, contemporary and thorough reviews of diffusion in the soil–plant system, dorminancy, germinability, and germination in crop and weed seeds, and control of soil-borne plant pests. With this latest volume, Advances in Agronomy continues to be recognized as a leading reference and as a first-rate source of the latest research in agronomy, crop science, and soil science. KEY FEATURESFeatures articles on:The control of soil-borne plant pests Ion-diffusion in the soil–plant system Dormancy, germinability, and germination in crop and weed seeds Dynamic conservation of plant genetic resources Coal surface mine reclamation CONTENTS: P.K. Bretting and D.N. Duvick, Dynamic Conservation of Plant Genetic Resources. A. Jungk and N. Claasen, Ion Diffusion in the Soil–Root System. H.W.M. Hilhorst and P.E. Tooroop, A Review on Dormancy, Germinability and Germination in Crop and Weed Seeds. P.D. Brown and M.J. Morra, Control of Soil-Borne Pests Using Glucosinolate Containing Plants. R.I. Barnhisel and J.M. Hower, Coal Surface Mine Reclamation in the Eastern United States: The Revegetation of Disturbed Lands to Hayland/Pasture or Cropland. Chapter References. Subject Index.