Download or read book Influence des hautes temp ratures sur la germination de graines de six esp ces de conif res du Qu bec written by Jasmin Villeneuve and published by . This book was released on 1991 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Trichier written by Alessandra Ceretto and published by Lulu.com. This book was released on with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Deficit Irrigation Practices written by Food and Agriculture Organization of the United Nations and published by Food & Agriculture Org.. This book was released on 2002 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the context of improving water productivity, there is a growing interest in deficit irrigation, an irrigation practice whereby water supply is reduced below maximum levels and mild stress is allowed with minimal effects on yield. Under conditions of scarce water supply and drought, deficit irrigation can lead to greater economic gains than maximizing yields per unit of water for a given crop; farmers are more inclined to use water more efficiently, and more water-efficient cash crop selection helps optimize returns. However, this approach requires precise knowledge of crop response to water as drought tolerance varies considerably by species, cultivar and stage of growth. The studies present the latest research concepts and involve various practices for deficit irrigation. Both annual and perennial crops were exposed to different levels of water stress, either during a particular growth phase, throughout the whole growing season or in a combination of growth stages. The overall finding, based on the synthesis of the different contributions, is that deficit or regulated-deficit irrigation can be beneficial where appropriately applied. Substantial savings of water can be achieved with little impact on the quality and quantity of the harvested yield. However, to be successful, an intimate knowledge of crop behavior is required, as crop response to water stress varies considerably.
Download or read book The Problems of the Arid Zone written by Unesco and published by paris. This book was released on 1962 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Methods in Aerobiology written by Paolo Mandrioli and published by Pitagora. This book was released on 1998-01-01 with total page 262 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book On the Origins of Chloroplasts written by National Institute of Allergy and Infectious Diseases (U.S.) and published by North Holland. This book was released on 1982 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Tropospheric Transport of Pollutants and Other Substances to the Oceans written by and published by . This book was released on 1978 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Quaternary Palaeoecology written by Harry John Betteley Birks and published by . This book was released on 2004 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Quaternary Palaeoecology, first published in 1980, discusses the methods and approaches by which Quaternary environments can be reconstructed from the fossil and sedimentary record. This knowledge is of great value as the Quaternary was a time of rapid ecological change, culminating in the present pattern and diversity of ecosystems. It is possible not only to relate these changes to fluctuating climates but also to infer what Man's early influence may have been. The authors describe how past flora and fauna can be reconstructed and how the numbers of fossils can be used to reconstruct past plant and animal populations and communities, and past environments. John Birks has researched in a variety of fields within Quaternary palaeoecology, including pollen analysis and vegetation history, environmental change, past climate reconstruction, and palaeolimnology. Since the 1980s he has introduced and developed numerical methods and quantitative approaches into palaeoecology and palaeolimnology. Besides research in Norway and the UK, he has also worked on palaeoecological problems in Svalbard, Sweden, Finland, Switzerland, Minnesota, and the Yukon. He serves on the editorial boards of several journals and has published widely on many aspects of Quaternary palaeoecology. He is currently Professor of Quantitative Palaeoecology at the University of Bergen, Norway, and University College London, UK. Hilary Birks researches on palaeoecology and past climates primarily through the use of plant macrofossil analysis. She took up the study of plant macrofossils in Minnesota, USA in 1970, where she investigated the modern representation of plants in lake sediments by their fruits and seeds, and also worked on the palaeolimnological record of recent eutrophication and late-glacial palaeoecology. Since then she has extended her macrofossil studies to the late-glacial of Scotland and western Norway, the full-glacial of Beringia (Alaska) and recent changes in North African lakes brought about by human activities. She is Professor of Palaeoecology at the University of Bergen, Norway and teaches palaeoecology at the University of Bergen and University College London, UK.
Download or read book Photosynthesis Bibliography written by Zdenek Sesták and published by Springer Science & Business Media. This book was released on 2013-11-11 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: The bibi iograp hy includes papers in a l I fields of photosynthesis research - from stu dies of model biochemical and biophysical systems of t he photosynt hes is mechanism to primary prod ucti on studied by t he so-ca Ile d growth analysis . In addition to papers devoted enti rel y to photosynth es is, papers on other topics are inc luded if t hey con t ai n data on photosynthetic activity, photorespiration, chloroplast structure, chlo rophylland carotenoid synthesi s and destruction, eta., or if they conta in valuable methodological information (measurement of selected environmentaI factars, leaf area, eta.) . In many branches it has been difficult to defi ne th e limits of int erest for photosynthesis researchers. This problem has arisen e. g. in topics deal ing with t he transfer of gases, where - in addition to t he papers on ca rbon dioxide transfe r - so me pape rs on water vapour transfer are included, these being of general appl icat ion or bringing new approaches . On th e other hand, m any papers deal ing wit h the anatomy and phys io logy of stomata have been omitted, if the aspect of ca rbon dioxide or water vapour exchange has not been discussed.
Download or read book Prebiotic Photochemistry written by Franz Saija and published by Royal Society of Chemistry. This book was released on 2021-06-09 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photochemistry is an important facet in the study of the origin of life and prebiotic chemistry. Solar photons are the unique source of the large amounts of energy likely required to initiate the organisation of matter to produce biological life. The Miller–Urey experiment simulated the conditions thought to be present on the early earth and supported the hypothesis that under such conditions complex organic compounds could be synthesised from simpler inorganic precursors. The experiment inspired many others, including the production of various alcohols, aldehydes and organic acids through UV-photolysis of water vapour with carbon monoxide. This book covers the photochemical aspects of the study of prebiotic and origin of life chemistry an ideal companion for postgraduates and researchers in prebiotic chemistry, photochemistry, photobiology, chemical biology and astrochemistry.
Download or read book Radon and Its Decay Products written by Philip K. Hopke and published by . This book was released on 1987 with total page 636 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Biometeorology written by Royal Society of Medicine (Great Britain) and published by . This book was released on 1962 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
