The AAAS Selected Symposia Series was begun in 1977 to provide a means of more permanently recording and more widely disseminating some of the valuable material which is discussed at the AAAS Annual National Meetings. The volumes in the Series are based on symposia held at theMeetings which address topics of current and continuing significance, both within and among the sciences, and in the areas in which science and technology have an impact on public policy. The Series format is designed to provide for rapid dissemination of information, so the papers are reproduced directly from camera-ready copy. The papers are organized and edited by the symposium arrangers who then become the editors of the various volumes. Most papers published in the Series are original contributions which have not been previously published, although in some cases additional papers from other sources have been added by an editor to provide a more comprehensive view of a particular topic. Symposia may be reports of new research or reviews of established work, particularly work of an interdisciplinary nature, since the AAAS Annual Meetings typically embrace the full range of the sciences and their societal implications.
List of Tables and Figures -- Acknowledgment -- Chapter 1 - INTRODUCTION /J. E. Box, Jr. and L. C. Hammond -- Chapter 2 - SOIL STRUCTURAL INFLUENCES ON THE ROOT ZONE AND RHIZOSPHERE /R. R. Allmaras and S. D. Logsdon -- Chapter 3 - SOIL ORGANIC MATTER, TILLAGE, AND THE RHIZOSPHERE /C. E. Clapp, J. A. E. Molina, and R.H. Dowdy -- Chapter 4 - TOOLS FOR STUDYING RHIZOSPHERE DYNAMICS /Dan R. Upchurch and Howard M. Taylor -- Chapter 5 - MICROBIAL RESPONSES IN TH~ RHIZOSPHERE OF AGRICULTURAL PLANTS /P. G. Hunt -- Chapter 6 - DISTRIBUTION, STRUCTURE, AND FUNCTION OF EXTERNAL HYPHAE OF VESICULAR-ARBUSCULAR MYCORRHIZAL FUNGI /David M. Sylvia -- Chapter 7 - COLLEMBOLAN POPULATIONS AND ROOT DYNAMICS IN MICHIGAN AGROECOSYSTEMS /R. J. Snider, R. Snider, and A. J.M. Smucker -- Chapter 8 - EARTHWORMS AND AGRICULTURAL MANAGEMENT /E. J. Kladivko and H.J. Timmenga -- Chapter 9 - SHOOT/ROOT RELATIONSHIPS AND BIOREGULATION /M. J. Kasperbauer -- Chapter 10 - ROOT-SHOOT RELATIONSHIPS IN COTTON /B. L. McMichael -- Chapter 11 - THE EFFECTS OF GRAVITY ON THE ECOLOGY AND DYNAMICS OF ROOT GROWTH /Randy Moore -- Chapter 12 - EFFECTS OF MECHANICAL IMPEDANCE ON ROOT DEVELOPMENT /M. C. Whalen and L. J. Feldman -- Chapter 13 - SOIL AND PLANT ROOT WATER FLUX IN THE RHIZOSPHERE /Morris G. Huck and Gerrit Hoogenboom -- Index -- About the Contributors.