IRRIGATION FUNDAMENTALS is a comprehensive text on the basic principles and practices of applied agricultural irrigation. Written over a period of more than 10 years, it is based on the authors'' extensive experience in farming, consulting, research, teaching, and other related agricultural activities. The book is for use by teachers of introductory courses in irrigation, farmers who have some basic technical knowledge, and for administrators who need a general understanding of irrigation as an aid for policy decisions in water resource development and planning. Various factors that influence crop yield and production including climate, fertility, water, drainage, and agronomic practices are addressed. The various irrigation methods such as border, basin, contour, furrow, sub, sprinkle, and drip or trickle are described; and conditions are given for selection of the appropriate method to use. Recent developments and new technology are included herein when they have obvious practical applications, but for the most part the material presented in this book is based on well established principles and practices. Much of the content is very practical and much is essentially nontechnical. Nevertheless, some of the material covered in this book goes beyond the basic concepts in an attempt to better describe the relationships and techniques employed by irrigation scientists and irrigation engineers.From the Preface: The future of the world depends very much on how we manage natural resources. Since the year 1900 there has been a ninefold increase in global carbon emissions from burning fossil fuels, and the world population has increased about 3.7 times in this century. Vast areas of forests have been destroyed, and irrigated lands now produce 40% of the food supply. Due to depletion of groundwater reserves and an increase in population, irrigated area per capita is declining. Consequently, the irrigation of additional alluvial lands is a strategic necessity for all of humankind. Much of the alluvial lands cannot be made productive without prior development of water resources through flood control, drainage, and irrigation. The production of electricity through hydropower and the production of alcohol fuel from irrigated crops, as has been practiced for many years in Brazil, can slow the increase in carbon emissions. Such diverse developments are typically not separable; rather, they must be considered as integral parts of a comprehensive development plan. The conservation of natural resources and increasing productivity of irrigated lands are also strategic necessities. Much of the current technology is highly transferable and crop yields can be significantly increased on lands already under irrigation.The authors have worked in many countries in connection with resource inventories, teaching, and the planning, development and use of irrigation as a tool for increasing production and providing employment. They have written extensively and have been honored for their achievements. They have considerable experience with everything from primitive low-technology irrigation developments to highly developed irrigation in the USA and in dozens of countries around the world. Both of the authors have dedicated their careers to teaching, research, and consulting in agricultural irrigation and water resources development and planning. It is their hope and expectation that this book will provide incentives for investigating and documenting land and water resources, improving development, increasing crop yields, conserving resources, and improving the environment. From the Table of Contents:Chapt. 1 - INTRODUCTION: Irrigation Fundamentals: - - A Definition of Irrigation - - Statistical Perspectives of Agricultural IrrigationChapt. 2 - FACTORS INFLUENCING CROP PRODUCTION: - - Introduction - - Temperature, Radiation, and Evaporative Potential - - Climate Change - - Soil Fertility and Fertilizers - - Water Availability and Distribution - - Soil Aeration and Drainage - - Plant Density, Spacing and Leaf Area Index - - Crop VarietyChapt. 3 - AGRICULTURAL SOILS: - - Introduction - - Soil Texture and Structure - - Soil Classification and Evaluation - - Bureau of Reclamation Land Classification - - Soil Age and Topography - - Soil Chemistry - - Infiltration Rates - - Soil-Water Relationships - - Equations for Soil Water Content - - Soil Water Potential - - Measuring Soil Water ContentChapt. 4 - EVALUATING IRRIGATION RESOURCES: - - Introduction - - Climate - - Hydrology - - Human and Other Factors - - Integrated DevelopmentChapt. 5 - IRRIGATION METHODS: - - Introduction - - Graded Border Irrigation - - Basin Irrigation - - Contour Levees - - Furrow Irrigation - - Sub-Irrigation - - Sprinkle Irrigation - - Drip or Trickle Irrigation - - Selecting an Irrigation Method - - Land Grading and Leveling - - Laser-Leveling Equipment and Practices - - Computing Diagonal Slopes - - Irrigation System EvaluationChapt. 6 - CROP WATER REQUIREMENTS: - - Introduction - - Direct Methods - - Indirect Methods - - Potential Evaporation - - Reference Evapotranspiration - - Extraterrestrial Solar Radiation - - Irrigation Requirements - - Crop CoefficientsChapt. 7 - IRRIGATION SCHEDULING: - - Introduction - - Allowable Water Depletion - - Monitoring Soil Water - - Scheduling Irrigations - - Rice Irrigation
This book is a reconsideration of the practice of whitewashing church interiors during the Protestant Reformation in the sixteenth and seventeenth centuries. It is the first detailed study of its kind which challenges the view that whitewash was always only a 'cheap coat of paint'. Victoria George pulls together several histories: of the colour white from the biblical period to the present, and ideas about the colour white in philosophy, theology, art, and architecture from antiquity to the present. She links them to case studies of the ways in which reformers Huldrych Zwingli and John Calvin thought about colour in a careful analysis of the role of colour-thinking in their theological writings. The social meanings embodied in the word, 'whitewash' as it entered the printed media in the 17th century is explored as part of a chapter on the history of whitewashing itself. The long-term symbolic and aesthetic implications of the practice of whitewashing are examined in the larger context of material culture; in terms of their value as a metaphor, for both the Reformed Protestant and the Catholic in opposition to them; and for the uses to which whitewash has been put over time. George proposes that the practice was not only visually transformative but held importance for religious aesthetics as an agent of change, and for an aesthetics of minimalism generally, especially evident in the twentieth and twenty-first centuries. Victoria George received an MFA from the Royal College of Art (London), an MA from The Architectural Association, and a Ph.D. from Cambridge. She has taught religion and the arts at the University of Richmond in Virginia.
The latest volume in the critically acclaimed Letters of Benjamin Disraeli series contains or describes 952 letters (778 perviously unpublished) written by Disraeli between 1852 and 1856.
What are the processes of exclusion and inclusion amongst girls’ friendship groups? Can friendship and bullying coexist? Is the leader in the class always the most popular member of the class? What is the role of the teacher in consolidating group friendships? How are culturally diverse friendships negotiated? What impact does the process of transition from primary to secondary school have on existing friendship networks? Through an exploration of the emotional and social dynamics of young girls’ friendship groups, this book addresses these and other questions, which are important in their lives. The girls that feature in this book are inner city preadolescent girls as they transfer from their inner city primary school to their secondary schools. The schools are all located within an urban context and represent the state and public sector of education. The girls encompass the diversity of ethnicities that are found within large urban communities and how they negotiate and manage their friendships across ethnic divisions is a key aspect of this book. By focussing on the constitution of the friendship groups, questions of ‘leadership’ and ‘popularity’, ‘race’ and ethnicity and ‘bullying’ are interrogated and their resonance for the ‘exclusionary’ and ‘inclusionary’ practices which often characterise friendship groups are examined. This book highlights the emotional investment girls make in their friendships and will support teachers, youth workers and others working within educational contexts, in making visible this previously unattended aspect of young girls’ lives.
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