Download or read book Variation and Competition of Downy Brome Bromus Tectorum in Winter Wheat Triticum Aestivum written by Phillip W. Stahlman and published by . This book was released on 1989 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Weed Crop Competition written by Robert L. Zimdahl and published by John Wiley & Sons. This book was released on 2007-11-19 with total page 235 pages. Available in PDF, EPUB and Kindle. Book excerpt: For the past 20 years, the first edition of this text has been widely cited as authoritative academic reference. The latest edition continues the tradition set by the original book, and covers weed science research that has been published since 1980. This book aims to reduce the instance of research duplication—saving scientists and supporting institutions time and money. Not only does the second edition of Weed Crop Competition review, summarize, and combine current research; it critiques the research as well. This text has the potential to accelerate advancements in weed crop competition, which remains an important factor that affects crop yields. Scientists in foreign countries where access to literature is often limited or nonexistent, will find the information in this text invaluable. Weed scientists, crop scientists, plant ecologists, sustainable agriculturists, and organic agriculturists will be well-pleased with this long overdue and much needed new editionWeed Crop Competition provides a unique reference that reviews, summarises and synthesizes the literature published concerning research on this topic. The first edition has been one of the most frequently cited sources in weed science for the past 20 years. The second edition covers the significant body of literature that has been published since 1980. Originally intended to survey existing research, the intent of the book is to reduce the instance of research duplication, thus saving scientists and their institutions time and money, and expediting advancements in weed crop competition, an important factor affecting crop yields. Scientists in foreign countries where access to the literature is often limited or non-existent, find the information an invaluable resource. This long overdue and much needed new edition rejuvenates the tradition set by the original book.
Download or read book Weed Biology and Climate Change written by Lewis H. Ziska and published by John Wiley & Sons. This book was released on 2011-01-11 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: Weed Biology and Climate Change will provide a synthesis of what is known regarding the probable impact of environmental change on weed biology. Chapters will look at impacts of weed biology on agriculture, invasive species that limit ecological diversity and weeds that serve as health risks. In addition it looks at current weed management strategies and how they will be affected by global climate change. The book covers an increasingly important area in plant science, crop science and ecological research, and will be essential reading for anyone exploring the biological impacts of a changing environment.
Download or read book Agriculture Climate Change and Food Security in the 21st Century written by Lewis H. Ziska and published by Cambridge Scholars Publishing. This book was released on 2018-01-23 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: With the global adoption of the “green revolution” in the 1970s; the long historical legacy of agriculture’s boom and bust cycle seemed – finally – to be put on hold. It appeared as though the apocalyptic nightmare of famine had been vanquished. However, now, man-made climate change poses a new and immediate crisis – from Syria to South Sudan – how do we feed the 10 billion people likely to inhabit the planet by 2050? How do we continue to feed, sustainably, the 7.5 billion of us that are already here? How do we do so in a climate that is becoming increasing hostile to food security? This book explores the history of agriculture, and the threat that climate change imposes for all aspects of our “daily bread”. While these challenges are severe and significant, it argues that we are not without hope, and offers a wide range of solutions, from polyculture farming to feminism that can, when applied, lead to a better future for humankind.
Download or read book Interference Growth and Physiological Respone of Downy Brome Bromus Tectorum and Medusahead Taeniatherum Asperum written by Abdullah Juma Al-Dakheel and published by . This book was released on 1986 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Growth, competitive performance, and physiological response of the introduced annuals downy brome (Bromus tectorum L. ) and medusahead (Taeniatherum asperum (Sim.) Nevski) were compared under various environmental conditions in growth chambers and greenhouses. Seeds of both species were collected near Verdi, Nevada. Effects of soil moisture on growth, resource partitioning, photosynthesis, stomatal conductance, and transpiration rates were characterized for both species. Competitive interactions between the species were assessed in replacement series experiments. Under unlimited moisture, mean dry matter production and leaf area were greater in downy brome than medusahead. Height and root/shoot ratios were higher in medusahead or similar to those of downy brome. Mean values of relative growth rate (RGR) and net assimilation rate (NAR) over the entire growing period were similar between the species. RGR was significantly higher in downy brome o f 40 d age, and higher in medusahead of 40 d age. Rate of biomass allocation to leaf area (LAR) correlated best with dry matter production in both species. LAR was higher in downy brome than medusahead on most sample dates. Moisture stress reduced height, leaf development, and consequently biomass production in both species. Downy brome maintained higher dry matter production than medusahead when moisture was limited, due to higher LAR in downy brome. Stomatal conductance and transpiration rates were higher in medusahead than downy brome throughout the growing period. Under moisture stress, both species were similar in conductance and transpiration rates. Carbon fixation response (measured by IRGA in laboratory cuvettes) to light throughout the growing period were similar for the two species, regardless of moisture conditions. Moisture stress reduced photosynthesis in each species by > 50%. Competitive performance in mixtures was related to the maximum relative growth rate (Rmax) attained during early plant development. With unlimited moisture, downy brome had higher Rmax and LAR than medusahead. These differences gave competitive superiority to downy brome in interspecific mixture. Under moisture stress, both species were similar in Rmax and in general competitive performance. Effects of three temperature regimes and two moisture levels on growth, interference, and photosynthesis response in downy brome and medusahead were investigated in growth chamber study. Plants were grown separately and in intra- and interspecific pairs. Optimum temperature for growth of both species was the moderate temperature regime (24/11 C ). At this moderate regime, medusahead yield was higher than that of downy brome. Downy brome yield was less affected by temperature extremes and was significantly higher than that of medusahead at these extremes. Moisture limitation reduced yield in both species at all temperature regimes. Variation in performance between species at each temperature regime was closely related to photosynthetic response and pattern of resource allocation. In mixtures, downy brome had higher yield than medusahead at all temperature regimes. At low temperature (16/5C), both species were competitively similar. The competitive advantage of downy brome over medusahead increased with increasing temperature and was most profound at high temperature (32/16C). In limited moisture, downy brome maintained higher yield than medusahead in pure stands and mixtures. Species competitive performance in mixture also correlated with photosynthesis and resource allocation. Effects of nitrogen and phosphorus supply on growth and interference between downy brome and medusahead were studied in sand culture using a modified replacement series experiment in the greenhouse. Three levels of nitrogen and phosphorus were applied in all possible combinations. Height, number of leaves, and biomass production were reduced in both species in response to nutrient reduction. Downy brome had higher dry matter production than medusahead at high concentrations of nitrogen or phosphorus or when both nutrient elements were present. When either nutrient was lacking, yields of both species were similar. Nitrogen deficiency was more influential on yield reduction than phosphorus in both species. In mixtures, downy brome was highly competitive at high concentrations of N and P. At lower levels of N and P, the species performed as competitive equals. Thus, early patterns of resource allocation and high growth rates in downy brome enable that species to outperform medusahead at high nutrient concentrations. Findings of these studies were discussed in relation to the distribution of the two species in the field.
Download or read book Australian Journal of Agricultural Research written by and published by . This book was released on 2004 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Plant Communities and Their Environment written by Manuel Oliveira and published by BoD – Books on Demand. This book was released on 2020-09-09 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents different perspectives on how to understand the complex interaction between plants and the environment. Plant communities adapt to biotic and abiotic stresses with different mechanisms and understanding these phenomena provides the means to better manage our environment and to cultivate crops that better serve our needs.
Download or read book Interference Growth and Physiological Respon s e of Downy Brome Bromus Tectorum and Medusahead Taeniatherum Asperum written by Abdullah Juma Al-Dakheel and published by . This book was released on 1986 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Weed Science written by and published by . This book was released on 1986 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Non chemical Weed Management written by Mahesh K. Upadhyaya and published by CABI. This book was released on 2007-01-01 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with the principles, concepts, technology, potential, limitations and impacts of various non-chemical weed management options. It contains 12 chapters discussing topics on prevention strategies in weed management, exploitation of weed crop interactions to manage weed problems, cultural methods, cover crops, allelopathy, classical biological control using phytophagous arthropods, bioherbicides (such as mycoherbicides), mechanical weed control, non-living mulches, thermal weed control and soil solarization.
Download or read book Bibliography of Agriculture written by and published by . This book was released on 1975 with total page 1196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Agronomy written by Donald L. Sparks and published by Gulf Professional Publishing. This book was released on 2003-08-19 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Agronomy continues to be recognized as a leading reference and a first-rate source of the latest research in agronomy. Major reviews deal with the current topics of interest to agronomists, as well as crop and soil scientists. As always, the subjects covered are varied and exemplary of the myriad subject matter dealt with by this long-running serial. Editor Donald Sparks, former president of the Soil Science Society of America and current president of the International Union of Soil Science, is the S. Hallock du Pont Chair of Plant and Soil Sciences at The University of Delaware. Maintains the highest impact factor among serial publications in Agriculture Presents timely reviews on important agronomy issues Enjoys a long-standing reputation for excellence in the field
Download or read book Cultural and Mechanical Weed Control written by Mary V. Gold and published by . This book was released on 1994 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Canadian Journal of Plant Science written by and published by . This book was released on 1986 with total page 1110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Agrindex written by and published by . This book was released on 1995 with total page 896 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Downy Brome Bromus Tectorum written by Weed Science Society of America and published by . This book was released on 1984 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book IGrow Wheat written by David E. Clay and published by . This book was released on 2012 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:
