Effect Of Tillage And Corn Row Spacing On Common Waterhemp Growth And Fecundity

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Effect of Tillage and Corn Row Spacing on Common Waterhemp Growth and Fecundity

Author : Dawn Ellen Nordby
Publisher :
ISBN 13 :
Total Pages : 126 pages
Book Rating : 4.:/5 (526 download)

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Book Synopsis Effect of Tillage and Corn Row Spacing on Common Waterhemp Growth and Fecundity by : Dawn Ellen Nordby

Download or read book Effect of Tillage and Corn Row Spacing on Common Waterhemp Growth and Fecundity written by Dawn Ellen Nordby and published by . This book was released on 2003 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: The acceptance of integrated weed management programs has been hindered by a lack of information on crop-weed interactions. Four experiments were conducted in central Iowa during 2001 and 2002 in corn planted in 38 and 76 cm rows to determine the response of common waterhemp (Amaranthus rudis Sauer) growth parameters to corn (Zea mays) row spacing and date of common waterhemp emergence. Four common waterhemp emergence cohorts were established in each experiment corresponding to the VE, V3, V5, and V8 stages of corn (Zea mays) development. Delayed emergence of common waterhemp in corn significantly affected all growth parameters of common waterhemp. Common waterhemp survival averaged 80, 44, 3, and 1% survival for the first, second, third and fourth cohorts respectively. Mature common waterhemp height for the first cohort was 140 cm, whereas plants emerging at the V8 corn stage were only 5 cm. Corn row spacing significantly affected biomass and fecundity of the first cohort, but later cohorts were not affected by row spacing. Biomass of the first cohort was 20% less in 38 cm rows than in 76 cm rows. Biomass and seed production of waterhemp emerging at the V3, V5, and V8 corn stages decreased 80, 97 and 99%, respectively in comparison to the first cohort. Field studies were conducted in 2001 and 2002 to evaluate the influence of tillage on common waterhemp (Amaranthus rudis Sauer) seedbank behavior. Emergence of common waterhemp was greater in no-till than chisel till. Tillage did not affect the initial time of emergence; however, the time to 50% emergence was longer in no-till than chisel till. Duration of emergence did not differ among tillage systems. Common waterhemp seed was concentrated near the soil surface in no-till, whereas seed in the chisel till were primarily found between 9 and 15 cm. The delayed and increased emergence in no-till contributes to the problems in managing common waterhemp in this system.

The Effect of Row Spacing and Plant Population of Corn on Soil Water Depletion

Author : Ronald J. Cominsky
Publisher :
ISBN 13 :
Total Pages : 356 pages
Book Rating : 4.:/5 (127 download)

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Book Synopsis The Effect of Row Spacing and Plant Population of Corn on Soil Water Depletion by : Ronald J. Cominsky

Download or read book The Effect of Row Spacing and Plant Population of Corn on Soil Water Depletion written by Ronald J. Cominsky and published by . This book was released on 1969 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Effect of Planting Date, Hybrid, Row Spacing, and Starter Fertilizer on Corn Growth and Development

Author : Philip Sheridan Ramsel
Publisher :
ISBN 13 :
Total Pages : 442 pages
Book Rating : 4.:/5 (489 download)

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Book Synopsis The Effect of Planting Date, Hybrid, Row Spacing, and Starter Fertilizer on Corn Growth and Development by : Philip Sheridan Ramsel

Download or read book The Effect of Planting Date, Hybrid, Row Spacing, and Starter Fertilizer on Corn Growth and Development written by Philip Sheridan Ramsel and published by . This book was released on 2001 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: This experiment was conducted during the 1999 and 2000 growing seasons at the Iowa State University Sorenson Farm located southwest of Ames, Iowa and at the Iowa State University North Central Research and Demonstration Farm located south of Kanawha, Iowa. The experimental design for both locations was a randomized complete block with a split-split-split plot design and three replications of each treatment. Treatments included three planting dates, three hybrids, two row spacings, and two fertility regimes. Whole plot treatment was planting date and split plot treatments were hybrid, row spacing, and fertility regime. Significant difference was found between row spacing treatments for yield with the June planting dates in 1999 with 38-cm row spacing yielding more than 76-cm row spacing. Significant difference was not found between row spacing treatments for yield at the other planting dates in 1999 or in 2000. As planting date was delayed, weight kernel−1 decreased at both locations in both years. Starter fertilizer produced significantly higher yields in 1999, with a cold and wet spring, but not in 2000 with a warm and dry spring. Producers should rely on calendar date recommendations in determining optimum planting date. Planting dates between late April to early May should result in maximum yields in most years. Starter fertilizer may provide benefits during a cold and wet spring as well in situations of a low soil test for P or K.

Master's Theses Directories

Author :
Publisher :
ISBN 13 :
Total Pages : 356 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Master's Theses Directories by :

Download or read book Master's Theses Directories written by and published by . This book was released on 2003 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Education, arts and social sciences, natural and technical sciences in the United States and Canada".

Weed-Crop Competition

Author : Robert L. Zimdahl
Publisher : John Wiley & Sons
ISBN 13 : 0470290102
Total Pages : 235 pages
Book Rating : 4.4/5 (72 download)

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Book Synopsis Weed-Crop Competition by : Robert L. Zimdahl

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.

Manage Weeds on Your Farm

Author : Charles L. Mohler
Publisher :
ISBN 13 : 9781888626209
Total Pages : 400 pages
Book Rating : 4.6/5 (262 download)

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Book Synopsis Manage Weeds on Your Farm by : Charles L. Mohler

Download or read book Manage Weeds on Your Farm written by Charles L. Mohler and published by . This book was released on 2021 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt: Manage Weeds on Your Farm: A Guide to Ecological Strategies provides you with in-depth information about dozens of agricultural weeds found throughout the country and the best ways of managing them. In Part One, the book begins with a general discussion of weeds: their biology, behavior and the characteristics that influence how to best control their populations. It then describes the strengths and limitations of the most common cultural management practices, physical practices and cultivation tools. Part Two is a reference section that describes the identification, ecology and management of 63 of the most common and difficult-to-control weed species found in the United States.

Integrated Weed Management for Reduced Weed Infestations in Sustainable Cropping Systems

Author : Rodrigo Werle
Publisher : Frontiers Media SA
ISBN 13 : 2832537588
Total Pages : 144 pages
Book Rating : 4.8/5 (325 download)

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Book Synopsis Integrated Weed Management for Reduced Weed Infestations in Sustainable Cropping Systems by : Rodrigo Werle

Download or read book Integrated Weed Management for Reduced Weed Infestations in Sustainable Cropping Systems written by Rodrigo Werle and published by Frontiers Media SA. This book was released on 2023-10-30 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Weeds pose a major challenge to the sustainability of agricultural production systems, causing significant crop yield, economic and environmental losses. Chemical weed control tactics play a major role in modern weed management, maintaining the productivity of diverse cropping systems, reducing yield losses and facilitating conservation agriculture. However, the over-reliance on chemical weed control has led to shifts in weed communities in agroecosystems which are now becoming dominated by high competitors and herbicide resistance. Thus, weed scientists and practitioners are urged to develop and incorporate innovative and feasible integrated weed management (IWM) systems that can reduce weed infestations and environmental impacts.

Sustainable Market Farming

Author : Pam Dawling
Publisher : New Society Publishers
ISBN 13 : 1550925121
Total Pages : 459 pages
Book Rating : 4.5/5 (59 download)

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Book Synopsis Sustainable Market Farming by : Pam Dawling

Download or read book Sustainable Market Farming written by Pam Dawling and published by New Society Publishers. This book was released on 2013-02-01 with total page 459 pages. Available in PDF, EPUB and Kindle. Book excerpt: Growing for 100 - the complete year-round guide for the small-scale market grower. Across North America, an agricultural renaissance is unfolding. A growing number of market gardeners are emerging to feed our appetite for organic, regional produce. But most of the available resources on food production are aimed at the backyard or hobby gardener who wants to supplement their family's diet with a few homegrown fruits and vegetables. Targeted at serious growers in every climate zone, Sustainable Market Farming is a comprehensive manual for small-scale farmers raising organic crops sustainably on a few acres. Informed by the author's extensive experience growing a wide variety of fresh, organic vegetables and fruit to feed the approximately one hundred members of Twin Oaks Community in central Virginia, this practical guide provides: Detailed profiles of a full range of crops, addressing sowing, cultivation, rotation, succession, common pests and diseases, and harvest and storage Information about new, efficient techniques, season extension, and disease resistant varieties Farm-specific business skills to help ensure a successful, profitable enterprise Whether you are a beginning market grower or an established enterprise seeking to improve your skills, Sustainable Market Farming is an invaluable resource and a timely book for the maturing local agriculture movement.

Cotton Production

Author : Khawar Jabran
Publisher : John Wiley & Sons
ISBN 13 : 1119385512
Total Pages : 435 pages
Book Rating : 4.1/5 (193 download)

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Book Synopsis Cotton Production by : Khawar Jabran

Download or read book Cotton Production written by Khawar Jabran and published by John Wiley & Sons. This book was released on 2019-08-05 with total page 435 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides a comprehensive overview of the role of cotton in the economy and cotton production around the world This book offers a complete look at the world’s largest fiber crop: cotton. It examines its effect on the global economy—its uses and products, harvesting and processing, as well as the major challenges and their solutions, recent trends, and modern technologies involved in worldwide production of cotton. Cotton Production presents recent developments achieved by major cotton producing regions around the world, including China, India, USA, Pakistan, Turkey and Europe, South America, Central Asia, and Australia. In addition to origin and history, it discusses the recent advances in management practices, as well as the agronomic challenges and the solutions in the major cotton producing areas of the world. Keeping a focus on global context, the book provides sufficient details regarding the management of cotton crops. These details are not limited to the choice of cultivar, soil management, fertilizer and water management, pest control, cotton harvesting, and processing. The first book to cover all aspects of cotton production in a global context Details the role of cotton in the economy, the uses and products of cotton, and its harvesting and processing Discusses the current state of cotton management practices and issues within and around the world’s cotton producing areas Provides insight into the ways to improve cotton productivity in order to keep pace with the growing needs of an increasing population Cotton Production is an essential book for students taking courses in agronomy and cropping systems as well as a reference for agricultural advisors, extension specialists, and professionals throughout the industry.

A History of Weed Science in the United States

Author : Robert L Zimdahl
Publisher : Elsevier
ISBN 13 : 0123815029
Total Pages : 220 pages
Book Rating : 4.1/5 (238 download)

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Book Synopsis A History of Weed Science in the United States by : Robert L Zimdahl

Download or read book A History of Weed Science in the United States written by Robert L Zimdahl and published by Elsevier. This book was released on 2010-02-04 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is important that scientists think about and know their history - where they came from, what they have accomplished, and how these may affect the future. Weed scientists, similar to scientists in many technological disciplines, have not sought historical reflection. The technological world asks for results and for progress. Achievement is important not, in general, the road that leads to achievement. What was new yesterday is routine today, and what is described as revolutionary today may be considered antiquated tomorrow. Weed science has been strongly influenced by technology developed by supporting industries, subsequently employed in research and, ultimately, used by farmers and crop growers. The science has focused on results and progress. Scientists have been--and the majority remain--problem solvers whose solutions have evolved as rapidly as have the new weed problems needing solutions. In a more formal sense, weed scientists have been adherents of the instrumental ideology of modern science. That is an analysis of their work, and their orientation reveals the strong emphasis on practical, useful knowledge; on know how. The opposite, and frequently complementary orientation, that has been missing from weed science is an emphasis on contemplative knowledge; that is, knowing why. This book expands on and analyzes how these orientations have affected weed science’s development. The first analytical history of weed science to be written Compares the development of weed science, entomology and plant pathology Identifies the primary founders of weed science and describes their role

Sustainability of U.S. Soybean Production

Author : Council for Agricultural Science and Technology
Publisher :
ISBN 13 :
Total Pages : 116 pages
Book Rating : 4.0/5 ( download)

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Book Synopsis Sustainability of U.S. Soybean Production by : Council for Agricultural Science and Technology

Download or read book Sustainability of U.S. Soybean Production written by Council for Agricultural Science and Technology and published by . This book was released on 2009 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Genetically Engineered Crops

Author : National Academies of Sciences, Engineering, and Medicine
Publisher : National Academies Press
ISBN 13 : 0309437385
Total Pages : 607 pages
Book Rating : 4.3/5 (94 download)

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Book Synopsis Genetically Engineered Crops by : National Academies of Sciences, Engineering, and Medicine

Download or read book Genetically Engineered Crops written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2017-01-28 with total page 607 pages. Available in PDF, EPUB and Kindle. Book excerpt: Genetically engineered (GE) crops were first introduced commercially in the 1990s. After two decades of production, some groups and individuals remain critical of the technology based on their concerns about possible adverse effects on human health, the environment, and ethical considerations. At the same time, others are concerned that the technology is not reaching its potential to improve human health and the environment because of stringent regulations and reduced public funding to develop products offering more benefits to society. While the debate about these and other questions related to the genetic engineering techniques of the first 20 years goes on, emerging genetic-engineering technologies are adding new complexities to the conversation. Genetically Engineered Crops builds on previous related Academies reports published between 1987 and 2010 by undertaking a retrospective examination of the purported positive and adverse effects of GE crops and to anticipate what emerging genetic-engineering technologies hold for the future. This report indicates where there are uncertainties about the economic, agronomic, health, safety, or other impacts of GE crops and food, and makes recommendations to fill gaps in safety assessments, increase regulatory clarity, and improve innovations in and access to GE technology.

Ecological Management of Agricultural Weeds

Author : Matt Liebman
Publisher : Cambridge University Press
ISBN 13 : 1139427245
Total Pages : 546 pages
Book Rating : 4.1/5 (394 download)

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Book Synopsis Ecological Management of Agricultural Weeds by : Matt Liebman

Download or read book Ecological Management of Agricultural Weeds written by Matt Liebman and published by Cambridge University Press. This book was released on 2001-07-19 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents principles and practices for ecologically based weed management in a wide range of temperate and tropical farming systems. Special attention is given to the evolutionary challenges that weeds pose and the roles that farmers can play in the development of new weed-management strategies.

Weeds of the Northeast

Author : Richard Hart Uva
Publisher : Comstock Publishing Associates
ISBN 13 : 9780801483349
Total Pages : 0 pages
Book Rating : 4.4/5 (833 download)

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Book Synopsis Weeds of the Northeast by : Richard Hart Uva

Download or read book Weeds of the Northeast written by Richard Hart Uva and published by Comstock Publishing Associates. This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Here, at last, is a lavishly illustrated manual for ready identification of 299 common and economically important weeds in the region south to Virginia, north to Maine and southern Canada, and west to Wisconsin. Based on vegetative rather than floral characteristics, this practical guide gives anyone who works with plants the ability to identify weeds before they flower. - A dichotomous key to all the species described in the book is designed to narrow the choices to a few possible species. Identification can then be confirmed by reading the descriptions of the species and comparing a specimen with the drawings and photographs.- A fold-out grass identification table provides diagnostic information for weedy grasses in an easy-to-use tabular key.- Specimens with unusual vegetative characteristics, such as thorns, square stems, whorled leaves, or milky sap, can be rapidly identified using the shortcut identification table. The first comprehensive weed identification manual available for the Northeast, this book will facilitate appropriate weed management strategy in any horticultural or agronomic cropping system and will also serve home gardeners and landscape managers, as well as pest management specialists and allergists.

Fundamentals of Weed Science

Author : Robert Zimdahl
Publisher : Academic Press
ISBN 13 : 0323149421
Total Pages : 465 pages
Book Rating : 4.3/5 (231 download)

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Book Synopsis Fundamentals of Weed Science by : Robert Zimdahl

Download or read book Fundamentals of Weed Science written by Robert Zimdahl and published by Academic Press. This book was released on 2012-12-02 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamentals of Weed Science provides an introduction to the basic principles of weed science for undergraduate courses. It discusses several aspects of weed biology and control, and traces the history of herbicide development. The book begins with an introduction to weeds, covering their definition, characteristics, harmful aspects, and the cost of weed control. This is followed chapters on weed classification, the uses of weeds, weed biology, weed ecology, allelopathy, the significance of plant competition, weed management and control methods, and biological weed control. Later chapters deal with herbicidesthe most important weed control tools and the ones with the greatest potential for untoward effects. Students of weed science must understand herbicides and the factors governing their use as well as the potential for misuse. These chapters discuss chemical weed control, the properties and uses of herbicides, factors affecting herbicide performance, herbicide application, herbicide formulation, ecological impact of herbicides, pesticide registration and legislation, weed management systems, and the future of weed science.

Soybean

Author : Hany El-Shemy
Publisher : BoD – Books on Demand
ISBN 13 : 9533075341
Total Pages : 502 pages
Book Rating : 4.5/5 (33 download)

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Book Synopsis Soybean by : Hany El-Shemy

Download or read book Soybean written by Hany El-Shemy and published by BoD – Books on Demand. This book was released on 2011-11-02 with total page 502 pages. Available in PDF, EPUB and Kindle. Book excerpt: Worldwide, soybean seed proteins represent a major source of amino acids for human and animal nutrition. Soybean seeds are an important and economical source of protein in the diet of many developed and developing countries. Soy is a complete protein and soyfoods are rich in vitamins and minerals.Soybean protein provides all the essential amino acids in the amounts needed for human health. Recent research suggests that soy may also lower risk of prostate, colon and breast cancers as well as osteoporosis and other bone health problems and alleviate hot flashes associated with menopause. This volume is expected to be useful for student, researchers and public who are interested in soybean.

Modelling Crop-weed Interactions

Author : Martin J. Kropff
Publisher : Int. Rice Res. Inst.
ISBN 13 : 0851987451
Total Pages : 277 pages
Book Rating : 4.8/5 (519 download)

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Book Synopsis Modelling Crop-weed Interactions by : Martin J. Kropff

Download or read book Modelling Crop-weed Interactions written by Martin J. Kropff and published by Int. Rice Res. Inst.. This book was released on 1993 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt: General introduction; Empirical models for crop-weed competition; Eco-physiological models for crop-weed competition; Mechanisms of competition for light; Mechanisms of competition for water; Mechanisms of competition for nitrogen; Eco-physiological characterization of the species; Understanding crop-weed interaction in field situation; The impact of environmental and genetic factors; Practical applications.