The world needs for food and fiber continue to increase. Population growth in the developing countries peaked at 2. 4 percent a year in 1965, and has fallen to about 2. 1 percent. However, in many developing countries almost half the people are under 15 years of age, poised to enter their productive and reproductive years. The challenges to produce enough food for this growing population will remain great. Even more challenging is growing the food in the areas of greatest need. Presently the world has great surpluses of food and fiber in some areas while there are devastating deficiencies in other areas. Economic conditions and the lack of suitable infrastructure for distribution all too often limit the alleviation of hunger even when there are adequate supplies, sometimes even within the country itself. World hunger can only be solved in the long run by increasing crop production in the areas where the population is growing most rapidly. This will require increased efforts of both the developed and developing countries. Much of the technology that is so successful for crop production in the developed countries cannot be utilized directly in the developing countries. Many of the principles, however, can and must be adapted to the conditions, both physical and economic, of the developing countries.

The world needs for food and fiber continue to increase. Population growth in the developing countries peaked at 2. 4% a year in 1965 and has fallen to about 2. 1%. However, in many developing countries almost half the people are under 15 years of age, poised to enter their productive and reproductive years. The challenges to produce enough food for this growing population will remain great Even more challenging is growing the food in the areas of greatest need. Presently the world has great surpluses of food and fiber in some areas while there are devastating deficiencies in other areas. Economic conditions and the lack of suitable infrastructure for distribution all too often limit the alleviation of hunger even when there are adequate supplies, sometimes even within the country itself. World hunger can be solved in the long run only by increasing crop production in the areas where the population is growing most rapidly. This will require increased efforts of both the developed and developing countries. Much of the technology that is so successful for crop production in the developed countries cannot be utilized directly in the developing countries. Many of the principles, however, can and must be adapted to the conditions, both physical and economic, of the developing countries.

The Advanced Series in Agricultural Sciences is designed to ftll a long-felt need for advanced educational and technological books in the agricultural sciences. These texts, intended primarily for students of agriculture, should also provide up-to-date technical background reading for the many agricultural workers in extension services, educational systems, or international bodies. The editors of Advanced Series in Agricultural Sciences will select key subjects relating to the agricultural environment, agricultural physics and chemistry, soil science, plant sciences, animal sciences, food technology, and agricultural engineering for a critical and synthetic appraisal. An initial theoretical presentation will be used by authors of individual volumes in the series to develop a technical approach-including examples and practical solutions- to each subject. In addressing the advanced undergraduate and early graduate student of agriculture, selected authors will present the latest information, leavened with the lessons learned from their own experience, on precise and well-defined topics. Such books that widen the horizons of the student of agriculture can serve, too, as useful reference sources for the young specialist in the early years of his career. Many specialists who are involved in teaching agricultural science are isolated from universities and research institutions. This series will bring them up-to-date scientific information, thus keeping them in touch with progress. The basic objective of Advanced Series in Agricultural Sciences is to effect a structural integration of the theoretic and technical approaches to agriculture.

Soil is formed from physical and chemical weathering of rocks - processes described historically because they involve eons of time-by glaciation and by wind and water transport of soil materials, later deposited in deltas and loessial planes. Soil undergoes further transformations over time and provides a habitat for biological life and a base for the development of civilizations. Soil is dynamic -always changing as a result of the forces of nature and particularly by human influences. The soil has been studied as long as history has been documented. Numerous references to soil are found in historical writings such as Aristotle (384-322 B. c. ), Theophrastus (372-286 B. c. ), Cato the Elder (234-149 B. C. ) and Varro (116-27 B. c. ). Some of the earliest historical references have to do with erosional forces of wind and water. The study of soils today has taken on increased importance because a rapidly expanding population is placing demands on the soil never before experienced. This has led to an increase in land degradation and desertification. Desertifica tion is largely synonymous with land degradation but in an arid land context. Deterioration of soil resources is largely human induced. Poverty, ignorance, and greed are the indirect causes of desertification. The direct cause is mismanage ment of the land by practices such as overgrazing, tree removal, improper tillage, poorly designed and managed water distribution systems, and overexploitation."

From a general point of view the importance of striving to minimize envir- mental disturbances on the continental shelf cannot be overemphasized. Coastal areas are sites of population centers, navigation and recreation activities, and - source development, all of which contribute to environmental stress on the shelf. Proper management of the shelf for optimum use requires a thorough understanding of shelf processes. Complex problems, such as the influence of hydrodynamics on sediment dispersal, element differentiation and migration, physiochemical changes at the sediment water interface, the relationship - tween the pollutants and sediments, and the type of substrate with regard to benthic community and/or man-made structures require a multidisciplinary approach to their solution. The present study interrelates meteorologic, hyd- graphic, sedimentologic, and geochemical parameters to derme specific envir- ments on the Alaskan Shelf. These observations are then related to geologic principles in an effort to elucidate the sedimentary processes and elemental migration on the shelf. Attempts have also been made to relate the sediment texture to the geochem- try of the sediments. Obviously the chemistry is complicated as a result of b- genic contributions and variable provenance; however, to some extent elemental differentiation accompanies textural differentiation in sediments. The distribution of elements in various phases of crustal (source) rocks is gen- ally interpreted on the basis of crystallographic concepts, especially the concept of isomorphism.

Much has been learned about the proper and judicious use of fertilizers. Fertilizer application by farmers has grown from an art to a science. As food producers have strived to increase crop yields by overcoming nutrient deficiencies the use of fertil izers has increased dramatically. This has created a large chemical industry capable of supplying the needed plant food elements. A more complete understanding of soil chemistry and plant nutrition has led to greater fertilizer use with improved fertilization methods and crop cultural practices. Improved fertilizer technology has led to the production of more efficient forms of fertilizer. The modem fertilizer industry and with it fertilization practices began in the humid countries of the world. The use of fertilizers in arid and semiarid regions was later in development, although agriculture had its beginning in semiarid and arid regions. The development offertilizer use is parallel to industrial development in various areas of the world."

Histories of seaports and coastal resorts have usually been kept in separate compartments. This book brings them together and looks at how resort development affected historic ports during the rise and development of the seaside holiday in Europe from the 18th century to the 20th, and what the attributes of ports (fishing, harbour crafts, the whiff of the exotic, fishermen's homes and families) contributed to the attractions of resorts. Case-studies drawn from across Europe, from Wales and the Netherlands to Norway, Latvia and Spain, bring original perspectives to bear on these histories and relationships, and consider their influence on seaside heritage and regeneration at a time when coastal settlements are increasingly using their past to secure their future. The book will interest academics in tourism studies, history, geography and cultural studies, as well as provide essential information and analysis for policy-makers in coastal regeneration.

Proceedings of the NATO Advanced Study Institute, Cappuccini, San Miniato, Italy, July 18-30, 1982

The world population in 1950 was 2. 5 billion and is more than 5 billion today. The agriculture community, however, has responded remarkably well to meeting the increased need for food and fiber. While the population growth during this period averaged almost 2% annually, the production of grain increased at an even faster rate. From 1950 to 1973, grain production increased 3. 1% annually, but slowed to about 2% from 1973 to 1984. There fore, as a whole, the world has more grain per capita available today than ever before. Several countries that were food importers just a few years ago are food exporters today. The world carry-over stocks today are the highest in years. While the major concern just a few years ago was whether the world could produce adequate food, the problem for many countries today is how to export their surpluses. Although the world as a whole has surplus food supplies, there are millions of people without adequate food to exist, and there are additional millions who have a bare subsistence diet at best. The average daily calorie supply for the developed countries is more than 3,300 per person, while the average for the developing countries is only about 2,200. The major global food produc tion problems have shifted from Asia to Africa, where malnutrition, poverty, and starvation are attracting world attention."

Syntheses of the geology of major areas of the Earth's crust are increasingly needed in order that the features of, and the problems associated with, the secular evolution of the continents can be understood by a wide audience. Southern Africa is fortunate in having a remarkable variety of geological environments developed without many breaks over 3. 8 Ga, and many of the rock groups are household names throughout the geological world. In one respect the geology of Southern Africa is particularly important: cratonization clearly began as early as 3. 0 Ga ago, in contrast to about 2. 5 Ga in most other continental areas such as North America. This book documents very well the remarkable change in tectonic conditions that took place between the Early and Mid-Precambrian; we have here evidence of the very earliest development of rigid lithospheric plates. This book is a tribute to the multitudes of scientists who have worked out the geology of Southern Africa over many years and decades. Whatever their discipline, each provided a step in the construction of this fascinating story of 3. 8 Ga of crustal development. In the book the reader will find a detailed review of the factual data, together with a balanced account of interpretative models without the indulgence of undue speculation. One of its attractions is its multidisciplinary approach which provides a stimulating challenge to the reader.

This book is a collection of systematically prepared case studies describing the environmental policy ofthirteen countriesin terms ofcapacity-building. Capacity for environmental policy and management, as the concept is used in this volume, has been defined broadly as a society's "ability (...) to devise and implement solutions to environmental issues as part of a wider effort to achieve sustainable development" (OECD). Since the late 1960s capacity-building in environmental policy and management can be observed across the world. It may have made insufficient progress as yet from an environmentalist point of view, but it has produced some remarkable results, and not only in the industrialised world. In the first chapter we present the conceptual framework that underlies the national case studies. In the course ofour research project the authors ofthe book met together twice to discuss this framework in the light of the national experi ences and to harmonise their approaches. In this way we have tried to offer more than a collection of individual and incoherent case studies, focusing only on specific environmental problems, institutions, actors, or instruments. The idea behind this book is to give a systematic, comparative overview ofthe fundamental conditions under which environmental policies is practised in selected countries."

It is generally agreed that food, clothing and shelter are the three basic material needs of all people. A simple test for the successfulness of any economic system may therefore be the extent to which it succeeds in providing the population with these commodities. One would conjecture that in the countries that are generally considered as highly developed there would be no problems at all with their availability. And although this conjecture is to a large extent, confirmed by the evidence, it is nevertheless surprising that in western economies with the high per capita incomes housing is still an important object for public concern. Food and clothing are abundantly available in these countries, but the provision of housing is often an object of serious policy concern. To mention one striking example : in the Netherlands there still exist official figures that mention housing shortages of ten thousends of dwellings. This state of affairs is not mentioned here to motivate an exaggerated view on housing problems in Western countries. The situation in the Netherlands and comparable countries is indeed much better than that in underdeveloped countries and a comparison with developing countries would presumably show figures which are comparable to those for food or clothing. The point I want to make is that even in highly developed market economies where the availability of food and clothing is quite satisfactory, the availability of dwellings often is not.

This book is the first attempt to provide a comprehensive volume on the topic of energy geography. The book reviews research on energy geography, contain~ original refereed articles on energy and provides a chapter on future research directions in this subfield of geography. The book provides an overview of the research activity underway, and highlights the role of geographers and regional scientists in the study of energy topics. A diverse group of scholars contribute to the manuscript and the chapters show how di fferent research methodologies and approaches are employed in investigating a range of relevant energy problems. This book is intended for upper-level undergraduate students and graduate students in geography, regional science and related disciplines. It will also be useful to professional geographers who would like to know more about the energy geography subfield. Furthermore, the chapters will be interesting to applied geographers and energy policymakers who can see the value of the spatial perspective in addressing energy problems.

Despite the common understanding of the importance of desert development in the contemporary world, there are relatively few books published to date on this sub ject. The books and collective volumes published in this field deal primarily with environmental and physical aspects of desert development such as soil, agricul ture, vegetation, water resources, etc. In contrast, this book addresses the issues of regional and urban development in desert areas, which have not been given sufficient attention. The present book is socially oriented. It considers physical development of desert regions not as an end in itself, but rather as an essential precondition for creating socially attractive and desirable environments for human settlement. The book addresses the issues of desert development at three distinctive conceptual levels - region, urban envi ronment, and building -and deals with both cold and hot deserts. Approximately half of the chapters in this book are original contributions that have not been published elsewhere. The remaining chapters fall into two groups: 1) chapters which have been reprinted from various refereed journals, and 2) chapters initially printed elsewhere and revised by their respective authors specifi cally for this collective volume. In the former case, permission to reproduce the material has been obtained from the respective copyright holders, and the details of original publication and names of copyright holders are indicated in footnotes."

The world population in 1930 was 2 billion. It reached 3 billion in 1960, stands at 4. 6 billion today, and is expected to reach 6 billion by the end of the century. The food and fiber needs of such a rapidly increasing population are enormous. One of the most basic resources, perhaps the most basic of all, for meeting these needs is the soil. There is an urgent need to improve and protect this resource on which the future of mankind directly depends. We must not only learn how to use the soil to furnish our immediate needs, but also ensure that the ability of the soil to sustain food production in the future is unimpaired. This is indeed a mammoth task; a 1977 United Nations survey reported that almost one-fifth of the world's cropland is now being steadily degraded. This volume is the first of a new series entitled Advances in Soil Science. The diversity of soil makes it necessary for research to be conducted in many locations. There are basic principles, however, that are universal. This new series will present clear and concise reviews in all areas of soil science for everyone interested in this basic resource and man's influence on it. The purpose of the series is to provide a forum for leading scientists to analyze and summarize the available scientific information on a subject, assessing its importance and identifYing additional research needs.

Reservoirs for Wastewater Storage and Reuse is a compendium of available information on this emergent technology, from the role that wastewater reservoirs can play within general water resources management and wastewater reuse policy, to the design and operation of the units, including removal efficiencies for different pollutants. Furthermore, a detailed description of the ecological structure and function of the ecosystem of reservoirs is given. This book summarizes more than 20 years of research and development in Israel where more than 200 of these reservoirs are in operation. It includes both theoretical developments and practical experience gained by designers, operators and farmers. Potential geographic areas for the use of these reservoirs are the whole Mediterranean region, the Pacific coasts of both South and North America, the Atlantic coasts of Africa, the Middle East, and other regions suffering water shortage.

In the past decade there has been growing recognition that economic development is not mainly exogenously determined but, to a large extent, is a transformation process induced and governed by economic actors who respond to competitive, institutional and political challenge. This 'challenge and response' model is increasingly accepted as a valid analytical framework in modem growth theory and also explains the popularity of endogenous growth approaches to technological innovation issues. However, a major and as yet largely under-researched topic is the question of the diffusion and adoption of new technological changes in the context of space-time dynamics. This diffusion and adoption pattern has obviously clear spatial and temporal variations connected with behavioural responses which may vary over time and different locations. This means that a closer analysis of spatio-temporal opportunities and impediments is necessary in order to fully map the complex interactions of technology and economy in space and time. This volume sets out to bring together a collection of original contributions commissioned by the editors to highlight the spatio-temporal patterns and backgrounds of the diffusion and adoption of new technologies. Some are in the nature of a survey, others.have a modelling background and again others are case studies. The contributions originate from different countries and different disciplines. This book is complementary to a previously published volume on technological innovation, Technological Change, Economic Development and Space, edited by C.S. Bertuglia, M.M. Fischer and G. Preto, and also published by Springer-Verlag (1995).

Choice processes appear in all spheres of society. Hitherto ruling paradigms in the modelling of choice problems have presumed a competitive general equi- librium which, however, proves insufficient for dynamic processes. This contribution aims at providing a general coherent and closed frame- work for the dynamic modelling of decision processes. It was one of my main interests to build a bridge between the pure model building concepts and their practical applications. Therefore all given examples are related to empirical work. Solution algorithms for the estimation of trend parameters as well as the numerical simulation in concrete applications therefore playa central role in this contribution. Friendly relations with a number of colleagues from many universities in Europe, and the U.S. have emerged during the different applications. I wish to thank all of them. The international cooperations were mainly initiated and supported by conferences and workshops organized and financed by the International Institute for Applied Systems Analysis (lIASA), the Istituto Ricerche Economico-Sociali Del Piemonte (I RES). the Institut National D 'Etudes De'mographiques (I NED), the Centre for Regional Science Research UmeJ. (CERUM) and the Projets de Cooperation et D'Echange avec France (Procop>' Special thanks go to the Volkswagen Stiftung for financial support of this work over the years. Thanks also go in particular to my friend and mentor Prof.W.Weidlich for his encouragement and for the many suggestions he made in fruitful discus- sions and common work that have taken place over the years.

National parks and protected areas offer a wealth of ecological and social contributions or services to humans and life on earth. This book describes the strengths of national parks and protected areas in different parts of Europe and North America and the challenges to the full realization of their goals. It shows that they are useful not only in conserving rare species and biodiversity, but also in protecting water supply and other resources necessary to tourism and to economic and social development generally. Ideas and information on useful planning, management and decision-making arrangements are presented, and research needs are identified.

"Landscape Ecology" is an emerging science of gaining momentum over the past few decades in the scientific as well as in the planning-management worlds. Although the field is rooted in biology and geography, the approaches to understanding the ecology of a landscape are highly divers. This hybrid vigor provides power to the field. One can no longer view a local ecosystem or land use in isolation from global areas and time frames. The surrounding landscape mosaic and the flows and movements in a landscape must be considered, especially the linkage between humans requiring resources provided by nature, the constraints on their use as well as the responding landscape.

The Oak Ridge National Laboratory's Environmental Sciences Division initiated the Walker Branch Watershed Project on the Oak Ridge Reservation in east Tennessee in 1967, with the support of the U. S. Department of Energy's Office of Health and Environmental Research (DOE/OHER), to quantify land-water interactions in a forested landscape. It was designed to focus on three principal objectives: (1) to develop baseline data on unpolluted ecosystems, (2) to contribute to our knowledge of cycling and loss of chemical elements in natural ecosystems, and (3) to provide the understanding necessary for the construction of mathe matical simulation models for predicting the effects of man's activities on forested landscapes. In 1969, the International Biological Program's Eastern Deciduous Forest Biome Project was initiated, and Walker Branch Watershed was chosen as one of several sites for intensive research on nutrient cycling and biological productivity. This work was supported by the National Science Foundation (NSF). Over the next 4 years, intensive process-level research on primary productivity, decomposition, and belowground biological processes was coupled with ongoing DOE-supported work on the characterization of basic geology and hydrological cycles on the watershed. In 1974, the NSF's RANN Program (Research Applied to National Needs) began work on trace element cycling on Walker Branch Wa tershed because of the extensive data base being developed under both DOE and NSF support."

Since 1962 the Desert Institute of the former Academy of Science of the USSR has been conducting research work in the arid and semi-arid zones of central Asia. This outstanding experience in desert and desertification problems, and the possibilities of sustainable land use under difficult environmental conditions is summarized here. The book also gives an overview of the Institute's consulting work within the framework of international projects. This is the first publication allowing readers outside the Russian-speaking world to obtain concise information about the specific constraints and development possibilities of central Asian drylands.

The soil is the medium through which pollutants originating from human activities, both in agriculture and industry, move from the land surfaces to groundwater. Polluting substances are subject to complex physical, chemical and biological transformations during their movement through the soil. Their displacement depends on the transport properties of the water-air-soil system and on the molecular properties of the pollutants. Prediction of soil pollution and restoration of polluted soils requires an under standing of the processes controlling the fate of pollutants in the soil medium and of the dynamics of the contaminants in the un saturated zone. Our book was conceived. as a basic overview of the processes governing the behavior of pollutants as affected by soil constituents and environmental factors. It was written for the use of specialists working on soil and unsaturated zone pollution and restoration, as well as for graduate students starting research in this field. Since many specialists working on soil restoration lack a back ground in soil science or a knowledge of the properties of soil pollutants, we have included this information which forms the first part of the book. In the second part, we discuss the partitioning of pollutants between the aqueous, solid and gaseous phase of the soil medium. The retention, transformation and transport of pollutants in the soils form the third section."

This book addresses basic questions concerning the ecological relationships and current conditions of the major river systems in Florida . . There have been relatively few comprehensive studies made of the rivers of Florida. There is, to be sure, voluminous information that addresses various aspects of riverine ecology. However, little such information has been collected in a way that allows even a preliminary understanding of the driving forces that determine how the diverse freshwater and associated brackish systems function. This lack of useful data is the product of a fundamental ignorance concerning the scale of endeavor, both spatially and temporally, that is needed if we are to understand and, parenthetically, manage the major drainage systems of this area of the country (Livingston, 1987). Research used to address management problems should entail a continuous series of interrelated studies, descriptive and experimental, that answer the immediate (and often less important) questions that are asked on a day-to-day basis. The research should also be designed to answer questions that have not yet been asked. In other words, ecosystem research should be organized on an appropriate scale so that system-wide processes are understood and pr

The mutual relationship between change in population distribution and its determinants and consequences on one hand, and social and economic development on the other, is becoming an increasingly important area of concern for researchers, policy makers and planners alike. During tha last several years the International Geographical Union Commission on Population Geography has devoted much of its attention to this problem and organized a series of international meetings focusing on population redistribution and its ramifications in different parts of the world. During one such meeting, held in 1980 in Karachi, Pakistan, some thirty papers were submitted by participants coming mostly from five countries in South Asia: Bangladesh, India, Nepal, Pakistan and Sri Lanka. The present volume is an outcome of that symposium, but it should not be regarded merely as a report of proceedings; these have been published separately by the Commission. Furthermore, all Pakistani papers were published in their original version in a separate volume edited by M.1. Siddiqi, who coordinated local arrangements for the meeting on behalf of Karachi University. This present volume offers only a selection of the original papers, all substantially edited and thoroughly revised, and brings them together with additionally solicited texts. All original figures have been redrawn and tables and references have been updated and standardized as much as possible.