Outils de formation pour la production de semences PDF Download

Author: Organisation des Nations Unies pour l'alimentation et l'agriculture
Publisher: Food & Agriculture Org.
ISBN: 9251319049
Category : Technology & Engineering
Languages : fr
Pages : 128

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Book Description
Les semences sont un moyen-clé pour améliorer les cultures. Ils constituent donc un élément essentiel dans la production agricole. Les semences sont uniques, elles doivent rester vivantes et saines lorsqu’elles sont utilisées. Les semences sont également l’intrant que les agriculteurs peuvent produire eux-mêmes. Ces facteurs ont été pris en compte lors de la préparation de ces outils d’information, qui comprend les six modules interdépendants, Développement d’entreprises semencières à petite échelle, Traitement des semences, Contrôle de la qualité et certification des semences, Cadre réglementaire du secteur des semences, Commercialisation des semences, Stockage des semences

Author:
Publisher:
ISBN:
Category : Forests and forestry
Languages : en
Pages : 172

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Author: Dave Goulson
Publisher: Oxford University Press, USA
ISBN: 9780198526070
Category : Nature
Languages : en
Pages : 260

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Book Description
Bumblebees are undergoing a widespread decline, but this has not yet caught the attention of the general public to the same extent as, for example, the plight of rare butterflies or birds. This title attempts to draw attention to the importance of conserving dwindling bumblebee populations.

Author: David Satterthwaite
Publisher: IIED
ISBN: 184369560X
Category : Population
Languages : en
Pages : 50

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Author: Barbara Gemmill-Herren
Publisher: Routledge
ISBN: 1317445686
Category : Technology & Engineering
Languages : en
Pages : 310

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Book Description
It is only recently that the immense economic value of pollination to agriculture has been appreciated. At the same time, the alarming collapse in populations of bees and other pollinators has highlighted the urgency of addressing this issue. This book focuses on the specific measures and practices that the emerging science of pollination ecology is identifying to conserve and promote animal pollinators in agroecosystems. It reviews the expanding knowledge base on pollination services, providing evidence to document the status, trends and importance of pollinators to sustainable agricultural production. It provides practical and specific measures that land managers can undertake to ensure that agroecosystems are supportive and friendly to pollinators. It draws on the Global Pollination Project, supported by UNEP/GEF and implemented by FAO and seven partner countries (Brazil, Ghana, India, Kenya, Nepal, Pakistan and South Africa), which serve to provide "lessons from the field".

Author: Matthew Shepherd
Publisher:
ISBN:
Category : Juvenile Nonfiction
Languages : en
Pages : 164

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"The Pollinator Conservation Handbook is an indispensable resource for gardeners, farmers, and managers of parks, recreational areas, and wild lands. It will guide you through the steps for creating and improving habitat for insect pollinators, including selecting and planting forage flowers, providing nesting and egg-laying sites, and caring for your pollinator habitat over time. The Handbook also contains an extensive resources section and ideas for educational activities." --Amazon.

Author: Constantin Papastefanou
Publisher: Elsevier
ISBN: 0080555985
Category : Medical
Languages : en
Pages : 187

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Book Description
Whenever radioactivity is released to the atmosphere, for example by the detonation of nuclear weapons or the testing of nuclear weapons or from nuclear reactor accidents that fraction of it which remains airborne for more than a few hours is liable to be attached to aerosol particles. The resulting radioactive aerosols are carried by atmospheric mixing processes until they settle out or are scavenged by precipitation. The radiation exposure pathway of maximum concern to humans is by inhalation of aerosols and their deposition in the respiratory tract. In this context, it is important to note that radioactive aerosols are commonly of natural origin alos. In particular, the associated radionuclides can be of natural terrestrial origin, such as the decay products of radon gas, or they can e cosmogenic, such as beryllium-7. The exposure of miners of uranium and other ores and minerals to radon and its aerosol-borne decay products is of major significance. The book describes the formation of aerosols, their aerodynamic size distribution, their atmospheric residence time, their sampling and measurement, the range of radioactive aerosols found and studied thus far, including man-made nuclides and radon decay products and their interaction with man, including deposition in the lung and subsequent health effects. - Advanced level science handbook for researchers, scientists and academics - Covers all aspects of radiation exposure in humans, including subsequent health implications - Presents the latest findings and analysis in this highly topical area

Author: A. Cazenave
Publisher: Springer
ISBN: 3319324497
Category : Science
Languages : en
Pages : 336

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Book Description
This book is a collection of overview articles showing how space-based observations, combined with hydrological modeling, have considerably improved our knowledge of the continental water cycle and its sensitivity to climate change. Two main issues are highlighted: (1) the use in combination of space observations for monitoring water storage changes in river basins worldwide, and (2) the use of space data in hydrological modeling either through data assimilation or as external constraints. The water resources aspect is also addressed, as well as the impacts of direct anthropogenic forcing on land hydrology (e.g. ground water depletion, dam building on rivers, crop irrigation, changes in land use and agricultural practices, etc.). Remote sensing observations offer important new information on this important topic as well, which is highly useful for achieving water management objectives.Over the past 15 years, remote sensing techniques have increasingly demonstrated their capability to monitor components of the water balance of large river basins on time scales ranging from months to decades: satellite altimetry routinely monitors water level changes in large rivers, lakes and floodplains. When combined with satellite imagery, this technique can also measure surface water volume variations. Passive and active microwave sensors offer important information on soil moisture (e.g. the SMOS mission) as well as wetlands and snowpack. The GRACE space gravity mission offers, for the first time, the possibility of directly measuring spatio-temporal variations in the total vertically integrated terrestrial water storage. When combined with other space observations (e.g. from satellite altimetry and SMOS) or model estimates of surface waters and soil moisture, space gravity data can effectively measure groundwater storage variations. New satellite missions, planned for the coming years, will complement the constellation of satellites monitoring waters on land. This is particularly the case for the SWOT mission, which is expected to revolutionize land surface hydrology. Previously published in Surveys in Geophysics, Volume 37, No. 2, 2016

Author: W. G. Eisert
Publisher: Springer Science & Business Media
ISBN: 3642693342
Category : Medical
Languages : en
Pages : 343

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Book Description
In October 1982, a small international symposium was held at the Gesellschaft fUr Strahlen- und Umweltforschung mbH (GSF) in Munich as a satellite meeting of the IX International Conference on Analytical Cytology. The symposium focussed on cytometric approaches to biological dosimetry, and was, to the best of our knowledge, the first meeting on this subject ever held. There was strong encouragement from the 75 attendees and from others to publish a proceedings of the symposium. Hence this book, containing 30 of the 36 presentations, has been assembled. Dosimetry, the accurate and systematic determination of doses, usually refers to grams of substance administered or rads of ionization or some such measure of exposure of a patient, a victim or an experimental system. The term also can be used to describe the quantity of an ultimate, active agent as delivered to the appropriate target material within a biological system. Thus, for mutagens, one can speak of DNA dosimetry, meaning the number of adducts produced in the DNA of target cells such as bone-mar row stem cells or spermatogonia.

Author: United States. Environmental Protection Agency. Office of Radiation Programs
Publisher:
ISBN:
Category : Radiation
Languages : en
Pages : 200

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