Xem 1-20 trên 43 kết quả In the weeds
  • The recent credit crisis in the United States ushered in a new era of uncertainty. In some ways it was just another bubble in a long line of fi nancial manias. Like any other bubble, it was born out of an extended period of easy money that fueled prosperity, engendered speculation, and ended in a spectacular crash. In some very important ways, however, the lingering impacts are different than the bubbles of recent memory.

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  • This guide has over 190 pages of weed control information updated annually and tailored for Ohio and Indiana. In the guide you will find: Weed control response tables Herbicide information labeled in corn, soybean, sweet corn, popcorn, small grains, grass or legume pastures, and grain sorghum Rotation restriction tables

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  • You have perhaps observed the regularity of arrangement in the twigs and branches of trees. Now pull up the roots of a plant, as, for example, sheep sorrel, Jimson weed, or some other plant. Note the branching of the roots. In these there is no such regularity as is seen in the twig. Trace the rootlets to their finest tips. How small, slender, and delicate they are! Still we do not see the finest of them, for in taking the plant from the ground we tore the most delicate away. In order to see the real construction of a...

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  • Nowadays, chemical pesticides are the traditional solution to weed and pest problems, and although they have saved lives and crops, the greatest risk to our environment and our health comes from their use. Many significant problems from their use include con‐ tamination of the environment, the development of pesticide resistance in the target pest, the recovery of pest species, the phytotoxicity in crop fields, and the unacceptably high levels of pesticide/commodity residue in food.

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  • The ongoing need for new agents to control weeds has stimulated the search for new photosynthetic inhibitors. We described in this chapter a variety of compounds presenting this type of activity. The natural products have been explored toward this end resulting in the identification of compounds with various structural motifs. Such an approach has resulted in the discovery of photosynthetic inhibitors with new modes of action. This, in turn, can be helpful in dealing whit resistance a problem to be faced in weed management....

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  • I visited Naples in the year 1818. On the 8th of December of that year, my companion and I crossed the Bay, to visit the antiquities which are scattered on the shores of Baiæ. The translucent and shining waters of the calm sea covered fragments of old Roman villas, which were interlaced by sea-weed, and received diamond tints from the chequering of the sun-beams; the blue and pellucid element was such as Galatea might have skimmed in her car of mother of pearl; or Cleopatra, more fitly than the Nile, have chosen as the path of her magic ship.

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  • Consumer concerns on food safety and society awareness of chemical contaminants in the environment have increased in the past few years. As a consequence, more restrictions in the use of chemical products have been imposed at national and international levels. Pesticides are widely used for the control of weeds, diseases, and pests of cultivated plants all over the world, mainly since after Second World War, with the discovery of some organic compounds with good insecticide or herbicide activity. At present, around 2.

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  • Weeds severely affect crop quality and yield. Therefore, successful farming relies on their control by coordinated management approaches. Among these, chemical herbicides are of key importance. Their development and commercialization began in the 1940's and they allowed for a qualitative increase in crop yield and quality when it was most needed. This book blends review chapters with scientific studies, creating an overview of some the current trends in the field of herbicides.

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  • Invasive alien plants are harmful non-native plant species whose introduction or spread threatens the environment, the economy, and society, including human health. They can be introduced into Canada from other countries or continents, or from one region of Canada to another. The current threats posed by invasive alien plants are real and growing. Why are invasive alien plants a problem? The economic cost of invasive alien plants to Canadians is enormous. Weeds in crops and pastures alone cost an estimated $2.2 billion annually.

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  • Though alternative methods of controlling insects, rodents, insect pests, pathogens, microbes and weeds have been developed, pesticides could not be replaced. The prosperous role of pesticides in the management of insect pests and diseases is indisputable. However, its nature of non selective toxicity towards other organisms and deposition in the environment warrants the legislation of usage. Pesticide use raises a number of environmental concerns.

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  • Of the many books that have been written about weed management, most have focused on the use of herbicides. This volume is different. Instead of providing information about chemical weed control technologies, the emphasis here is on weed management procedures that rely on manipulations of ecological conditions and relationships. By focusing on ecologically based methods of management, we have been able to provide in-depth treatment of subjects that most weed science books treat only briefly.

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  • The research issues concerning the production of coatings are the most important directions of surface engineering development, ensuring the obtainment of coatings of high usable properties in the scope of mechanical characteristics and corrosion resistance.

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  • Our goal in writing this book was to describe why weeds occur where they do. We have made no attempt to discuss their management and control: there are excellent texts available for that. Rather, we think that students should understand how and why weeds fit into their environment. This text presents ecological principles as they relate to weeds. Ecology is central to our understanding of how and why weeds invade and yet there are few books that make this connection. That is the niche we hope to fill.

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  • The scope of this book is to demonstrate that we do have an ecosystem theory that can be used to describe ecosystem structure and function. It was previously shown in the book, Integration of Ecosystem Theories: A Pattern (3rd edition, 2002), that the various contributions to systems ecology are consistent and together form a pattern of ecological processes. My book with Yuri Svirezhev, Toward a Thermodynamic Theory of Ecosystems (2004), presented the thermodynamics of this pattern in a mathematical language....

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  • Developmental biology studies the process by which organisms grow and develop. Originating in embryology, modern developmental biology studies the genetic control of cell growth, differentiation, and "morphogenesis," which is the process that progressively gives rise to tissues, organs, and anatomy. Model organisms for developmental biology include the round worm Caenorhabditis elegans,[39] the fruit fly Drosophila melanogaster,[40] the zebrafish Danio rerio,[41] the mouse Mus musculus,,[42] and the weed Arabidopsis thaliana.

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  • Ian and Jane Campbell of Barambah Organics near Murgon in Queensland produce, process and market certified organic milk. Their movement into organic production was born from a long family interest in sustainable agriculture and the need to create a point of difference for their products. “Customers are often surprised by the unique taste of our milk. It comes from a balanced and healthy diet for the cows on our chemical-free broadacre pastures,” said Ian. Soil health and weed control are important considerations and are carefully managed with compost manures and lime.

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  • Publishers are not dealing with an incremental increase in workload associated with peer review, but rather a crush of manuscripts that must be fed through processes and procedures that may struggle to keep ahead of this tide. When this is the case, publication editors and staff are often forced to quickly weed through submissions and try to identify any “possible” candidates that can be processed into the peer review process, triaging out ‘poorer’ or ‘less relevant’ manuscripts early in the process.

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  • Some energy crop species are rich in toxic chemicals (such as allelochemicals in Jatropha). These toxic oilseed crops can enter the food chain inmanyways. Research studies on the toxicity have highlighted the potential negative impacts on the ecosystem, including other plantsthatmightgrowinthevicinity. Pesticidesimpacttheenvironmentatseverallevels(fromproductionoffertilizerstocultivation ofenergycrops).Studiesshow that theenvironmental footprint iscomparatively largerduring the cultivation process.

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  • The percentage of hard substratum cover will be using the Points Intercept method (Hodgson and Waddell,1996) on the 6 replicate of the transect 150 m total long The data was collected including by hard coral, soft coral (to the specific of genus and living growth of form. For example ACB: Acropora branching coral), dead coral, dead coral with algae, sea weed, sponge, gravel, sand, rock, silt/clay and other organism living in the coral reef. (English et al 1997).

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  • Since the synthesis of DDT during 1874 several insecticide molecules have been identified and synthesized globally for the control of insect pests, pathogens, microbes, vectors of human and animal diseases, weeds and other obnoxious organisms. Currently, 1.8 billion kgs of pesticides are used annually worldwide in the form of herbicides, insecticides and fungicides. There are more than 1055 active ingredients registered as pesticides till date implying that there is no best alternate for the chemical pesticide.

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