Download or read book The Effect of Defoliation and Nitrogen Application on the Seed Yield of Linn Perennial Ryegrass Lolium Perenne L and Merion Kentucky Bluegrass Poa Pratensis L written by Matthew William Mulanax and published by . This book was released on 1971 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of clipping and supplemental nitrogen application on seed production of Linn perennial ryegrass and Merion Kentucky bluegrass was studied. Clipping and nitrogen treatments did not significantly affect the seed yield of Linn perennial ryegrass during the 1967 growing season. The seed yield of Merion Kentucky bluegrass was significantly increased by a combined winter-spring clipping regime when compared with the unclipped control. Application of 136 pounds of nitrogen in two equal spring applications significantly reduced the seed yield of Merion Kentucky bluegrass. Spring clipping tended to reduce the number of fertile tillers per unit area for both species. Supplemental nitrogen generally increased the number of fertile tillers per unit area for Linn perennial ryegrass. Application of 30 pounds of additional nitrogen delayed the period of head emergence for Linn perennial ryegrass. The time of pollen shed of Merion Kentucky bluegrass was delayed by all clipping regimes.
Download or read book O S U Theses and Dissertations 1970 1977 written by Oregon State University and published by . This book was released on 1980 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Paclobutrazol and Nutrient Treatment Effects on Ovation Perennial Ryegrass written by J. Kevin Turner and published by . This book was released on 1989 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: Rapid tiller and root production can improve seedling survival and benefit stand establishment of perennial ryegrass (Lolium perenne L.) in commercial seed fields. Environmental conditions after establishment and inherent morphological factors combine to reduce the commercially harvested yield below the theoretical potential yield. These studies were conducted to determine if the growth retardant paclobutrazol and KCl could favor maximum seed yields of the cultivar Ovation under field conditions. In addition, effects of paclobutrazol and P on seedling development were examined in a growth chamber. Paclobutrazol increased seed yields in both first- and second-year stands in each of three climatically different years. Yield increases were primarily due to increased numbers of spikes per unit area during the wet year of 1984 and to increaseed numbers of seeds per spike in the dry years of 1985 and 1986. Seeds per unit area and harvest indices increased and thousand seed weights (TSW) decreased in all three years. KC1 applications were intended to offset the anticipated paclobutrazol-induced TSW reductions. Positive fertilizer effects were due to Cl rather than K. Chloride fertilizer salts tended to increase seed yields, seeds per unit area, and TSW in 1984 and significantly increased yields, seeds per unit area and TSW in 1985. Severe drought masked possible Cl effects in 1986. The effects of Cl were thought to be due to its influence on N form taken up by the plant. Paclobutrazol reduced shoot and root weights but did not affect the shoot:root ratios of 90-day old growth chamber grown seedlings. Plant growth in height was reduced within two days of application, which suggested the dependence of seedlings on continual gibberellin production. Phosphorus increased the shoot weights of 90-day old seedlings, but did not affect root weights. Significant interactions were observed on the numbers of leaves and tillers per plant within 9 and 16 days of treatment applications, respectively. Paclobutrazol increased numbers of leaves and tillers per plant, but only at the high P rate. The reduced root growth caused by paclobutrazol and the immobile nature of P in the soil may account for the interaction effects.
Download or read book Cultural Practices and Infectious Crop Diseases written by Josef Palti and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 259 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of a crop, and therefore its health, is always the result of interplay between biological and environmental factors, as influenced by human agency. In other words, crop health is a highly complex affair. This book is concerned with only one group of agents affecting crop health, the pathogens, and not with animal pests or direct effects of physiological or weather factors. Even within this one group, however, the interaction of causal agents with environmental and biotic factors is highly complex. No less complex is the effect of cultural practices on the crop and its health. There is probably no major practice that does not affect diverse facets of crop growth, which in turn affects crop/pathogen relationships. Thus tillage se quentially affects depth and rate of root development, hence nutrient uptake, hence general plant size and habit as well as crop climate and crop susceptibility. Irri gation affects all these parameters, and facilitates crop growth under diverse macro climatic conditions, with all the ensuing implications for disease development. In this book an attempt is made to superimpose one set of complexities, the cul tural practices, on another such set, crop health. This may seem overambitious, not to say foolhardy, unless we remember that it has been done by farmers, consciously or unconsciously, ever since the beginnings of agriculture. We are here chiefly try ing to rationalize traditional practices, review modern research on the development of further practices, and assess the place of the latter in integrated disease control.
Download or read book Agrobacterium Protocols written by Kan Wang and published by Humana Press. This book was released on 2010-12-09 with total page 512 pages. Available in PDF, EPUB and Kindle. Book excerpt: Agrobacterium tumefaciens is a soil bacterium that for more than a century has been known as a pathogen causing the plant crown gall disease. Unlike many other pathogens, Agrobacterium has the ability to deliver DNA to plant cells and permanently alter the plant genome. The discovery of this unique feature 30 years ago has provided plant scientists with a powerful tool to genetically transform plants for both basic research purposes and for agric- tural development. Compared to physical transformation methods such as particle bomba- ment or electroporation, Agrobacterium-mediated DNA delivery has a number of advantages. One of the features is its propensity to generate single or a low copy number of integrated transgenes with defined ends. Integration of a single transgene copy into the plant genome is less likely to trigger “gene silencing” often associated with multiple gene insertions. When the first edition of Agrobacterium Protocols was published in 1995, only a handful of plants could be routinely transformed using Agrobacterium. Ag- bacterium-mediated transformation is now commonly used to introduce DNA into many plant species, including monocotyledon crop species that were previously considered non-hosts for Agrobacterium. Most remarkable are recent devel- ments indicating that Agrobacterium can also be used to deliver DNA to non-plant species including bacteria, fungi, and even mammalian cells.
Download or read book Pesticide Resistance written by National Research Council and published by National Academies Press. This book was released on 1986-02-01 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on a symposium sponsored by the Board on Agriculture, this comprehensive book explores the problem of pesticide resistance; suggests new approaches to monitor, control, or prevent resistance; and identifies the changes in public policy necessary to protect crops and human health from the ravages of pests. The volume synthesizes the most recent information from a wide range of disciplines, including entomology, genetics, plant pathology, biochemistry, economics, and public policy. It also suggests research avenues that would indicate how to counter future problems. A glossary provides the reader with additional guidance.
Download or read book Handbook of Turfgrass Management and Physiology written by Mohammad Pessarakli and published by CRC Press. This book was released on 2007-10-09 with total page 730 pages. Available in PDF, EPUB and Kindle. Book excerpt: A multibillion dollar industry that has tripled in the last ten years, turfgrass management plays an important role in landscaping, golf courses, and other sports surfaces. Proper management and cultural practices are crucial for the performance of these versatile grasses, creating a demand among scientists, researchers, and industry professionals
Download or read book Pesticide Management and Insecticide Resistance written by David Watson and published by Elsevier. This book was released on 2012-12-02 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pesticide Management and Insecticide Resistance explores the problem of insect resistance to pesticides and reviews various approaches to pesticide management and safety. It looks at the environmental hazards of pesticide residues and their regulation, along with application techniques aimed at maximum efficiency against the pest and minimum waste to pollution, safety considerations in the development of pest control programs, and pesticide monitoring. Divided into eight parts encompassing 49 chapters, this volume begins with an overview of the global pesticide industry and the costs of commercializing pesticides relative to their profit potential. It then introduces the reader to the release of fluorohydrocarbon propellants in pesticidal aerosols and their hazards to the ozone layer, management of pests in urban environments, international plant protection, the current status of DDT, the importance of training pest-control personnel, and procedures of forest spraying. Other chapters focus on pesticide management safety from a medical perspective; pesticide safety as it relates to the manufacturing, warehousing, and distribution of pesticides; importance of pesticide application equipment and related field practices in developing countries; and the importance of pesticides in successful pest management programs. This book is a valuable resource for scientists, students, researchers, and policymakers who want to ensure the safety of consumers, applicators, and harvesters when using pesticides.
Download or read book Plant Environment Interactions written by Robert E. Wilkinson and published by CRC Press. This book was released on 2000-07-12 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents comprehensive coverage of differentiated plant responses to changing environments. It focuses on how multiple and combined stress factors influence plant survival. It examines the latest data on the capacity of roots to alter growth patterns due to disturbances in physical and/or chemical soil constraints, water supply, and other traumas. It contains over 85% new and updated material with more than 1500 new citations, tables, drawings, and photographs.
Download or read book Insecticide Resistance in Arthropods written by A. W. A. Brown and published by . This book was released on 1958 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book S Ethyl Dipropylthiocarbamate EPTC written by Canada. Pest Management Regulatory Agency and published by . This book was released on 2008-01-01 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: "After a re-evaluation of the herbicide S-ethyl dipropylthiocarbamate (EPTC), Health Canada's Pest Management Regulatory Agency (PMRA), under the authority of the Pest Control Products Act and Regulations, is granted continued registration of certain EPTC products for sale and use in Canada."--Document.
Download or read book Resistance of Vectors of Disease to Pesticides written by WHO Expert Committee on Vector Biology and Control and published by . This book was released on 1980 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ecological Theory and Integrated Pest Management Practice written by Marcos Kogan and published by Wiley-Interscience. This book was released on 1986-11-28 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Perspectives in integrated pest management: from an industrial to ecological model of pest management. Island biogeographic theory and integrated pest management. Population theory and understanding pest outbreaks. Trivial movement and foraging. Plant defense strategies and host-plant resistance. Plant defense-herbivore and biological control. Ecology of insect-pathogen and some possible applications. Plant-plant-pathogen-insect interactions.The Ecology of insecticides and the chemical control of insects. Agroecology and economics. Agroecosystems-structure, analysis, and modeling.
Download or read book Handbook of Plant and Crop Stress written by Mohammad Pessarakli and published by CRC Press. This book was released on 2016-04-19 with total page 1248 pages. Available in PDF, EPUB and Kindle. Book excerpt: The dynamic and expanding knowledge of environmental stresses and their effects on plants and crops have resulted in the compilation of a large volume of information in the last ten years since the publication of the second edition of the Handbook of Plant and Crop Stress. With 90 percent new material and a new organization that reflects this incre
Download or read book Compendium of Turfgrass Diseases written by Richard W. Smiley and published by American Phytopathological Society. This book was released on 1992 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Noninfectious diseases; Infectious diseases; Other agents, diseases, and disorders; Ecology and taxonomy of pathogenic fungi; Disease control strategy; Disease diagnosis.
Download or read book Pesticides in the Environment written by Robert White-Stevens and published by . This book was released on 1971 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Plant and Crop Physiology written by Mohammad Pessarakli and published by CRC Press. This book was released on 2001-09-18 with total page 997 pages. Available in PDF, EPUB and Kindle. Book excerpt: With contributions from over 70 international experts, this reference provides comprehensive coverage of plant physiological stages and processes under both normal and stressful conditions. It emphasizes environmental factors, climatic changes, developmental stages, and growth regulators as well as linking plant and crop physiology to the production of food, feed, and medicinal compounds. Offering over 300 useful tables, equations, drawings, photographs, and micrographs, the book covers cellular and molecular aspects of plant and crop physiology, plant and crop physiological responses to heavy metal concentration and agrichemicals, computer modeling in plant physiology, and more.
