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Author: Robert L Zimdahl Publisher: Elsevier ISBN: 0123815029 Category : Science Languages : en Pages : 220
Book Description
It is important that scientists think about and know their history - where they came from, what they have accomplished, and how these may affect the future. Weed scientists, similar to scientists in many technological disciplines, have not sought historical reflection. The technological world asks for results and for progress. Achievement is important not, in general, the road that leads to achievement. What was new yesterday is routine today, and what is described as revolutionary today may be considered antiquated tomorrow. Weed science has been strongly influenced by technology developed by supporting industries, subsequently employed in research and, ultimately, used by farmers and crop growers. The science has focused on results and progress. Scientists have been--and the majority remain--problem solvers whose solutions have evolved as rapidly as have the new weed problems needing solutions. In a more formal sense, weed scientists have been adherents of the instrumental ideology of modern science. That is an analysis of their work, and their orientation reveals the strong emphasis on practical, useful knowledge; on know how. The opposite, and frequently complementary orientation, that has been missing from weed science is an emphasis on contemplative knowledge; that is, knowing why. This book expands on and analyzes how these orientations have affected weed science’s development. The first analytical history of weed science to be written Compares the development of weed science, entomology and plant pathology Identifies the primary founders of weed science and describes their role
Author: Robert L Zimdahl Publisher: Elsevier ISBN: 0123815029 Category : Science Languages : en Pages : 220
Book Description
It is important that scientists think about and know their history - where they came from, what they have accomplished, and how these may affect the future. Weed scientists, similar to scientists in many technological disciplines, have not sought historical reflection. The technological world asks for results and for progress. Achievement is important not, in general, the road that leads to achievement. What was new yesterday is routine today, and what is described as revolutionary today may be considered antiquated tomorrow. Weed science has been strongly influenced by technology developed by supporting industries, subsequently employed in research and, ultimately, used by farmers and crop growers. The science has focused on results and progress. Scientists have been--and the majority remain--problem solvers whose solutions have evolved as rapidly as have the new weed problems needing solutions. In a more formal sense, weed scientists have been adherents of the instrumental ideology of modern science. That is an analysis of their work, and their orientation reveals the strong emphasis on practical, useful knowledge; on know how. The opposite, and frequently complementary orientation, that has been missing from weed science is an emphasis on contemplative knowledge; that is, knowing why. This book expands on and analyzes how these orientations have affected weed science’s development. The first analytical history of weed science to be written Compares the development of weed science, entomology and plant pathology Identifies the primary founders of weed science and describes their role
Author: Robert Zimdahl Publisher: Academic Press ISBN: 0323149421 Category : Technology & Engineering Languages : en Pages : 464
Book Description
Fundamentals of Weed Science provides an introduction to the basic principles of weed science for undergraduate courses. It discusses several aspects of weed biology and control, and traces the history of herbicide development. The book begins with an introduction to weeds, covering their definition, characteristics, harmful aspects, and the cost of weed control. This is followed chapters on weed classification, the uses of weeds, weed biology, weed ecology, allelopathy, the significance of plant competition, weed management and control methods, and biological weed control. Later chapters deal with herbicidesthe most important weed control tools and the ones with the greatest potential for untoward effects. Students of weed science must understand herbicides and the factors governing their use as well as the potential for misuse. These chapters discuss chemical weed control, the properties and uses of herbicides, factors affecting herbicide performance, herbicide application, herbicide formulation, ecological impact of herbicides, pesticide registration and legislation, weed management systems, and the future of weed science.
Author: Zachary J. S. Falck Publisher: University of Pittsburgh Pre ISBN: 0822977729 Category : History Languages : en Pages : 276
Book Description
As long as humans have existed, they’ve worked and competed with plants to shape their surroundings. As cities developed and expanded, their diverse spaces were covered with and colored by weeds. In Weeds, Zachary J. S. Falck presents a comprehensive history of “happenstance plants” in American urban environments. Beginning in the late nineteenth century and continuing to the present, he examines the proliferation, perception, and treatment of weeds in metropolitan centers from Boston to Los Angeles. In dynamic city ecosystems, population movements and economic cycles establish and transform habitats where vegetation continuously changes. Americans came to associate weeds with infectious diseases and allergies, illegal dumping, vagrants, drug dealers, and decreased property values. Local governments and citizens’ groups attempted to eliminate unwanted plants to better their urban environments and improve the health and safety of inhabitants. Over time, a growing understanding of the natural environment made “happenstance plants” more tolerable and even desirable. In the twenty-first century, scientists have warned that the effects of global warming and the heat-trapping properties of cities are producing more robust strains of weeds. Falck shows that nature continues to flourish where humans have struggled: in the aftermath of Hurricane Katrina, in the abandoned homes of the California housing bust, and alongside crumbling infrastructure. Weeds are here to stay.
Author: Robert L Zimdahl Publisher: Academic Press ISBN: 0123978181 Category : Technology & Engineering Languages : en Pages : 664
Book Description
This book addresses herbicides and their use as an important aspect of modern weed management and strives to place them in an ecological framework. Many weed scientists believe agriculture is a continuing struggle with weeds--without good weed control, good and profitable agriculture is impossible. Each agricultural discipline sees itself as central to agriculture's success and continued progress, and weed science is no exception. While not denying the importance of weed management to successful agriculture, this book places it in a larger ecological context. The roles of culture, economics, and politics in weed management are also discussed, enabling scientists and students to understand the larger effects on society. Information on New herbicides included, along with the old herbicides that are important for understanding the history New section on weed resistance to herbicides and genetic engineering New information on invasive plants Expanded chapters on Biological Control, Pesticide Legislation and Regulation, Weed Management Systems, and more Instructor resources can be found at http://textbooks.elsevier.com/web/Login.aspx, and it is password protected. Please contact your sales representative at [email protected] for access to the instructor resources. The insturctor site consists of chapter questions, essay questions, an exam and images from the book
Author: Martin A. Lee Publisher: Simon and Schuster ISBN: 1439102619 Category : Health & Fitness Languages : en Pages : 529
Book Description
In this book the author, an investigative journalist, traces the social history of marijuana from its origins to its emergence in the 1960s as a defining force in an ongoing culture war. He describes how the illicit marijuana subculture overcame government opposition and morphed into a multibillion-dollar industry. In 1996, Californians voted to legalize marijuana for medicinal purposes. Similar laws have followed in several other states, but not without antagonistic responses from federal, state, and local law enforcement. The author draws attention to underreported scientific breakthroughs that are reshaping the therapeutic landscape: medical researchers have developed promising treatments for cancer, heart disease, Alzheimer's, diabetes, chronic pain, and many other conditions that are beyond the reach of conventional cures. This book is an examination of the medical, recreational, scientific, and economic dimensions of the world's most controversial plant.
Author: National Academies of Sciences, Engineering, and Medicine Publisher: National Academies Press ISBN: 0309453070 Category : Science Languages : en Pages : 487
Book Description
Significant changes have taken place in the policy landscape surrounding cannabis legalization, production, and use. During the past 20 years, 25 states and the District of Columbia have legalized cannabis and/or cannabidiol (a component of cannabis) for medical conditions or retail sales at the state level and 4 states have legalized both the medical and recreational use of cannabis. These landmark changes in policy have impacted cannabis use patterns and perceived levels of risk. However, despite this changing landscape, evidence regarding the short- and long-term health effects of cannabis use remains elusive. While a myriad of studies have examined cannabis use in all its various forms, often these research conclusions are not appropriately synthesized, translated for, or communicated to policy makers, health care providers, state health officials, or other stakeholders who have been charged with influencing and enacting policies, procedures, and laws related to cannabis use. Unlike other controlled substances such as alcohol or tobacco, no accepted standards for safe use or appropriate dose are available to help guide individuals as they make choices regarding the issues of if, when, where, and how to use cannabis safely and, in regard to therapeutic uses, effectively. Shifting public sentiment, conflicting and impeded scientific research, and legislative battles have fueled the debate about what, if any, harms or benefits can be attributed to the use of cannabis or its derivatives, and this lack of aggregated knowledge has broad public health implications. The Health Effects of Cannabis and Cannabinoids provides a comprehensive review of scientific evidence related to the health effects and potential therapeutic benefits of cannabis. This report provides a research agendaâ€"outlining gaps in current knowledge and opportunities for providing additional insight into these issuesâ€"that summarizes and prioritizes pressing research needs.
Author: Merrill A. Ross Publisher: Prentice Hall ISBN: Category : Invasive plants Languages : en Pages : 584
Book Description
This introduction to the principles of weed science prepares readers to analyze real-life weed control problems and to develop integrated, practical approaches to solving them. Comprehensive in coverage and unique in presentation, it blends basic information on plant systems, soil systems, control methods, and management systems, and discusses various plants and herbicides by groups to provide an integrated framework from which to extend information to many different situations. For readers interested in weed science. "
Author: Godfrey Pearlson Publisher: Academic Press ISBN: 0128181753 Category : Medical Languages : en Pages : 326
Book Description
WHAT DO WE KNOW ABOUT MARIJUANA AND HOW DO WE KNOW IT? Marijuana is the most frequently consumed illicit drug worldwide, with over 158.8 million users, according to the UN. Responding to public pressure, the US federal government is likely to legalize recreational marijuana within the next few years. With increasing numbers of people using cannabis both medically and recreationally there are many looming questions that only science can answer. These include: What's likely to happen, both good and bad, if the US legalizes marijuana? What are some simple, science-based rules to separate fact from fiction and to help guide policy in the highly contentious marijuana debate? Exactly what is cannabis doing in the brain that gets us high? A journey through THC neuroscience Does cannabis really have medical benefits - what's the evidence? To what extent does cannabis impair driving? Can smoking marijuana in adolescence affect IQ or risk for developing schizophrenia? Is marijuana safe to use during pregnancy? Reviews the endocannabinoid system and why our bodies are full of "weed receptors" Introduces readers to the various forms of marijuana: flower, dabs, hash, edibles, shatter, vapes, tinctures, oils and synthetics, THC, CBD and terpenes. Demonstrates how and why cannabis affects different people very differently. Discusses how MRI and PET scans can help show the effects of marijuana on the brain. Discusses long-term effects of adolescent and adult cannabis use. Examines the evidence for cannabis’s role in increasing the risk for schizophrenia-like illnesses.
Author: Robert Clarke Publisher: Univ of California Press ISBN: 0520292480 Category : Science Languages : en Pages : 452
Book Description
Cannabis: Evolution and Ethnobotany is a comprehensive, interdisciplinary exploration of the natural origins and early evolution of this famous plant, highlighting its historic role in the development of human societies. Cannabis has long been prized for the strong and durable fiber in its stalks, its edible and oil-rich seeds, and the psychoactive and medicinal compounds produced by its female flowers. The culturally valuable and often irreplaceable goods derived from cannabis deeply influenced the commercial, medical, ritual, and religious practices of cultures throughout the ages, and human desire for these commodities directed the evolution of the plant toward its contemporary varieties. As interest in cannabis grows and public debate over its many uses rises, this book will help us understand why humanity continues to rely on this plant and adapts it to suit our needs.
Author: Robert L Zimdahl
Author: Robert L Zimdahl
Author: Robert L. Zimdahl
Author: Robert Zimdahl
Author: Zachary J. S. Falck
Author: Robert L Zimdahl
Author: Martin A. Lee
Author: National Academies of Sciences, Engineering, and Medicine
Author: Merrill A. Ross
Author: Godfrey Pearlson
Author: Robert Clarke