eBook downloads, eBook resources & eBook authors
This study shows how classical ecological principles, especially those relating to competition and population ecology, can be applied to growing two or more crops together and how the approach can improve agricultural yields.
Introduction: intercrops and ecology; The measurement of intercrop perfomance; The competitive production principle; Facilitation; Mechanisms of the competitive production principle; The environments modified to produce facilitation; Special problems in intercrops involving perennials; Weeds and intercrops; Variability and intercrops; Planning intercrops: a phenomenological approach: Planning intercrops: a mechanistic approach; Critical research directions for the future.
Agroecology is the science of applying ecological concepts and principles to the design, development, and management of sustainable agricultural systems. The Ecology of Agroecosystems highlights a collection of alternative agricultural methodologies and philosophies and provides an interdisciplinary approach that bridges the sociopolitical and historical context of agriculture. It includes the technical issues in a serious and ecological fashion and captures the complex merging of ecology, agriculture, politics and economics in both a historical and contemporary context. Readers will learn not only about the ethical and moral elements related to producing food of questionable quality while possibly impairing the environment, but also about the soil chemistry involved.
It was in late 2002 that the idea of preparing a collection of multi-authored chapters on different aspects of ag- st forestry as a compendium for the 1 World Congress of Agroforestry, June 2004, was tossed around. With the approval of the idea by the Congress Organizing Committee, serious efforts to make it a reality got under way in early 2003. The rigorously peer-reviewed and edited manuscripts were submitted to the publisher in December 2003. Considering the many differentindividualsinvolved in the task as authors and manuscriptreviewers, we feel quite pleased that the task could be accomplished within this timeframe. We are pleased also about the contents on several counts. First of all, the tropical-temperate mix of topics is a rare feature of a publication of this nature. In spite of the scienti?c commonalities between tropical and temperate practices of agroforestry, the differences between them are so enormous that it is often impossible to mesh them together in one publication. Secondly, several of the chapters are on topics that have not been discussed or described much in agroforestryliterature. A third feature is that some of the authors, though well known in their own disciplinary areas, are somewhat new to agroforestry; the perceptions and outlooks of these scholars who are relatively unin?uenced by the past happenings in agroforestry gives a whole new dimension to agroforestry and broadensthescopeofthesubject. Finally, ratherthanjustreviewingandsummarizingpastwork,mostchapterstake the extra effort in attempting to outline the next steps.
Sustainable agriculture is a rapidly growing field aiming at producing food and energy in a sustainable way for humans and their children. Sustainable agriculture is a discipline that addresses current issues such as climate change, increasing food and fuel prices, poor-nation starvation, rich-nation obesity, water pollution, soil erosion, fertility loss, pest control, and biodiversity depletion. Novel, environmentally-friendly solutions are proposed based on integrated knowledge from sciences as diverse as agronomy, soil science, molecular biology, chemistry, toxicology, ecology, economy, and social sciences. Indeed, sustainable agriculture decipher mechanisms of processes that occur from the molecular level to the farming system to the global level at time scales ranging from seconds to centuries. For that, scientists use the system approach that involves studying components and interactions of a whole system to address scientific, economic and social issues. In that respect, sustainable agriculture is not a classical, narrow science. Instead of solving problems using the classical painkiller approach that treats only negative impacts, sustainable agriculture treats problem sources. Because most actual society issues are now intertwined, global, and fast-developing, sustainable agriculture will bring solutions to build a safer world. This book series gathers review articles that analyze current agricultural issues and knowledge, then propose alternative solutions. It will therefore help all scientists, decision-makers, professors, farmers and politicians who wish to build a safe agriculture, energy and food system for future generations.
In the last decade, enormous progress has been made on the physiology of plant roots, including on a wide range of molecular aspects. Much of that progress has been captured in the chapters of this book. Breakthroughs have been made possible through integration of molecular and whole-plant aspects. The classical boundaries between physiology, biochemistry and molecular biology have vanished. There has been a strong focus on a limited number of model species, including Arabidopsis thaliana. That focus has allowed greater insight into the significance of specific genes for plant development and functioning. However, many species are very different from A. thaliana, in that they are mycorrhizal, develop a symbiosis with N2-fixing microsymbionts, or have other specialised root structures. Also, some have a much greater capacity to resist extreme environments, such as soil acidity, salinity, flooding or heavy-metal toxicities, due to specific adaptations. Research on species other than A. thaliana is therefore pivotal, to develop new knowledge in plant sciences in a comprehensive manner. This fundamental new knowledge can be the basis for important applications in, e.g., agriculture and plant conservation. Although significant progress has been made, much remains to be learnt. It is envisaged that discoveries made in the recent past will likely lead to major breakthroughs in the next decade.
***e FACHGEBIET*** Agriculture, Agronomy, Forestry, Horticulture, Soil Science, Environmental Science (esp. Plant Ecology), Agricultural Chemistry, Agricultural Economics, Natural Resource Economics, Sociology, and Anthropology ***INTERESSENTENGRUPPE*** Of interest to researchers, students, and professionals in the above fields.- Level: Technical Book, Monograph ***URHEBER*** S.R. Gliessman, University of California, Santa Cruz, CA (Ed.) ***TITEL*** Agroecology ***UNTERTITEL*** Researching the Ecological Basis for Sustainable Agriculture ***BIBLIOGRAPHISCHE-ANGABEN*** 1990. XIV, 380 pp. 87 figs. (Ecological Studies. Eds.: W.D. Billings, F. Golley, O.L. Lange, J.S. Olson, H. Remmert. Vol. 78) Hardcover DM 198,- ISBN 3-540-97028-2 ***CONTENTS*** Contents: Part I: Basic Ecological Concepts in Agroecosystems.- Part II: Agroecosystem Design and Management.- Index. ***LANGTEXT*** This book provides an introduction to research approaches in the emerging interdisciplinary field of agroecology. It demonstrates in a series of international case studies how to combine the more production-oriented focus of the agronomist with the more systems-oriented viewpoint of the ecologist. Different methodologies for quantifying and evaluating agroecosystem sustainability are presented and analyzed. Leading researchers in the field provide examples of the diversity and complexity of agroecological research, ranging from archeology to insect ecology, and examine design and management of agroecosystems that span from the humid tropics to temperate regions. This timely overview will be of great value to ecologists, agronomists, geographers, foresters, anthropologists, and others involved in developing a sustainable basis for land use, management, and conservation worldwide. ***RS-ENDE*** RS 11/89 PREX ***RS-NOTIZEN*** NY/Dr. Czeschlik
This book presents the core elements that underwrite agroecology. Expressed across twelve chapters, the universality of the core is the essence of agroecology. This alone would be of interest to researchers, students, and academics. Furthermore, the book contains a long, detailed, and inclusive glossary that, with over 160 entries, elaborates on the topics presented. Included are recent developments as well as time-tested, traditional farm practices. The book also advances the theoretical base, fills gaps in the published research, and suggests future opportunities and future directions. The book is internationally oriented, presenting both temperate and tropical agriculture. The book begins by comparing agroecology against conventional, monoculturally-based agriculture. In doing so, it defines the unique features of agroecology and their significance in achieving sustainable and environmentally-friendly agriculture. The book goes on to discuss the underlying technologies, the various manifestations of biodiversity, and the risk countermeasures associated with agroecology. This includes the farm landscape as a positive base for ecology, and how, if used well, it can produce major economic growth. The book concludes by summarizing the key findings, and assessing the macro-challenges facing agroecology.
Much of the world's forested land is dominated by mixed-species stands. Understanding the complex structure and dynamics of these mixtures is a necessary step in the process of formulating appropriate silvicultural systems for their management. David M. Smith, Professor Emeritus of Silviculture at Yale University, has devoted much of his career to the study of the structure, development, and silvicultural treatment of these kinds of stands. This volume is presented by Professor Smith's collegues to honor the contributions he has made to the field. It contains both reviews of past work and results of current studies of mixed stands: topics range from analysis of forest dynamics in unmanaged stands to studies of silvicultural systems applied to mixtures, with examples drawn from boreal, temperate, and tropical regions. Much of the work stresses the importance of understanding the characteristic growth patterns of individual species within mixed stands, and how species interactions shape developmental patterns.
