Weed Cereal Plants Allelopathic Interactions

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Weed Cereal Plants Allelopathic Interactions

Author : Ramin Lotfi
ISBN : 3659676160
Genre :
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Weeds differ in their ability to compete with crops at similar density levels. This is primarily because of differences in their growth habits and to some extent in the allelopathic. Allelopathy has been defined as the inhibitory or stimulatory effects of a plant or microorganism on other plants through the release of chemical compounds into the environment. Some crops and especially cereal plants such as wheat, barley and corn were also produce chemical materials which affect other plants growth and development.

Plant Plant Allelopathic Interactions

Author : Udo Blum
ISBN : 9400706839
Genre : Science
File Size : 72.65 MB
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In an effort to implement conservation measures farmers have used a variety of production methods, including the use of reduced or zero tillage and cover crops. One benefit of these production methods has been early season weed control. The literature suggests that a variety of mechanisms may be involved, among them the allelopathic effects of phenolic acids. This retrospective analysis addresses the following: How likely are phenolic acid concentrations and environmental conditions in wheat no-till cropping systems for the inhibition of annual broadleaf weed emergence? and Do phenolic acids have a dominant role or are they just one component of a larger promoter/modifier/inhibitor complex? The book covers allelopathic plant-plant interactions, laboratory and field experiments, and future research. It uses a journal format, provides justifications for procedures used, if-then hypotheses, and cons and pros so that readers can reach their own conclusions.
Category: Science

Plant Plant Allelopathic Interactions Ii

Author : Udo Blum
ISBN : 9783319047324
Genre : Science
File Size : 35.11 MB
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This volume presents detailed descriptions and analyses of the underlying features, issues and suppositions associated with seed and seedling laboratory bioassays presented in a previous volume. It is, however, broader in scope and substance in that the information provided is relevant to all water-soluble compounds released to soil by putative allelopathic living plants and their litter and residues. It is ultimately an attempt to update and expand the practical guidelines for designing laboratory bioassays that have previously been provided in the literature with the hope that the designs of future seed and seedling laboratory bioassays will become more relevant to field systems. Standard references have been included to provide background and additional details. This volume has been written specifically for researchers and their graduate students who are interested in studying plant-plant allelopathic interactions.
Category: Science

Allelopathy In Agroecosystems

Author : Ravinder Kumar Kohli
ISBN : 1560220910
Genre : Science
File Size : 39.83 MB
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Discover environmentally safe ways to control weeds and pests! Until now farmers have had to choose between using expensive herbicides and fertilizers, which pollute the water table, or watching crop yields drop. All too often, crop yields dropped anyway, despite intensive farming. Allelopathy in Agroecosystems offers fresh hope. It provides an in-depth understanding of allelopathy-the mysterious, complex biochemical interactions among plants and microbes. This little-understood phenomenon plays a large role in agriculture, for good or ill. It can lead to changes in nutrient dynamics, vegetation structure, and species diversity. This comprehensive treatise is the first compendium devoted to explaining and exploring these chemical interactions in agricultural crop systems. Allelopathy in Agroecosystems explains how these interactions can make soil “sick,” especially in intensively cropped areas. This leads to less growth and lower yield. On the other hand, it has great potential as an environmentally safe method of weed and pest management. The fascinating original research presented here will help you understand the complexities of this invisible yet potent force in agriculture. Allelopathy in Agroecosystems examines this interaction as it affects the most important concerns of farmers and agronomists, including: beneficial interactions between crops weed control using crop residues crop rotation natural herbicides genetic engineering soil rhizosphere bacteria improving pastures forest/crop interactions sustainable management of agroecosystems new directions for research International in scope, Allelopathy in Agroecosystems offers an abundance of scientific data on this revolutionary new concept. It offers incalculable potential for rescuing farmed-out land, increasing crop yields, and cutting back on expensive soil additives. Every agronomist, environmental scientist, policymaker, agricultural librarian, and advocate of sustainable farming needs this book.
Category: Science

Handbook Of Sustainable Weed Management

Author : Harinder P. Singh
ISBN : 9781482293593
Genre : Technology & Engineering
File Size : 44.75 MB
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Innovative Strategies for Managing Weeds in an Environmentally Protective Manner Successfully meeting the challenge of providing weed control without relying on dangerous chemicals that endanger the ecosystem or human lives, this compendium focuses on management strategies that reduce herbicidal usage, restore ecological balance, and increase food production. It also provides new insights and approaches for weed scientists, agronomists, agriculturists, horticulturists, farmers, and extentionists, as well as teachers and students. In the Handbook of Sustainable Weed Management, experts from Asia, Europe, North America, and Australia organize in one resource information related to weeds and their management from different ecosystems around the world that has been until now been scattered throughout the literature.. The text captures the multifaceted impacts of and approaches to managing weeds from field, farm, landscape, regional, and global perspectives. Generously illustrated with tables and figures, this book not only describes the various techniques for weed management but shows you what methods work best in a given region, or in response to a specific, invasive weed or invaded crop. Covering the full scope of modern weed science the handbook examines different aspects of weed management, including— • Cultural practices • Cover crops • Crop rotation designs • Potential of herbicide resistant crops • Bioherbicides • Allelopathy • Microorganisms • Integrated weed management In spite of advancement in technologies and procedures, weeds continue to pose a major ecological and economical threat to agriculture. Handbook of Sustainable Weed Management takes a broad view of weeds as a part of an agricultural system composed of interacting production, environmental, biological, economic, and social components all working together to find balance. This comprehensive book is a vital addition to the debate over how global weed management is changing in the 21st century. Also available in soft cover
Category: Technology & Engineering

Angewandte Botanik

Author :
ISBN : CORNELL:31924050825342
Genre : Botany
File Size : 41.34 MB
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Category: Botany

The Permaculture Edge

Author :
ISBN : CORNELL:31924058784236
Genre : Permaculture
File Size : 80.5 MB
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Category: Permaculture

Tropical Grassy Weeds

Author : F. W. G. Baker
ISBN : 0851987095
Genre : Cyperaceae
File Size : 25.82 MB
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Weeds are the cause of great losses to crop production in the tropics and grassy weeds present a particular problem because of their similarity to cereal crop plants. It is therefore difficult to devise control methods and management practices appropriate for such weeds. This book reviews our current knowledge of this subject and is the outcome of a workshop on integrated control of grassy weeds in tropical subsistence farming systems, held in Nairobi in February 1990. The workshop was organised by CASAFA (Commission on the Application of Science to Agriculture, Forestry and Aquaculture) of the International Council of Scientific Unions. The contents include a general review of grassy weeds, their physiology in tropical agriculture, management by biological and chemical control, integrated weed management, control in tropical cereals, in tropical grasslands and forage crops, in mixed crops and in upland rice, and overviews of grassy weeds in Kenya, the Phillipines and Australia.
Category: Cyperaceae

Weed Biology And Management

Author : Inderjit
ISBN : 9789401705523
Genre : Science
File Size : 82.27 MB
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Weeds hold an enigmatic and sometimes-controversial place in agriculture, where they are generally reviled, grudgingly tolerated, and occasionally admired. In most cases, growers make considerable effort to reduce the negative economic impact of weeds because they compete with crops for resources and hinder field operations, thereby affecting crop productivity and quality, and ultimately the sustainability of agriculture. Weed control in production agriculture is commonly achieved through the integration of chemical, biological, and mechanical management methods. Chemicals (herbicides) usually inhibit the growth and establishment of weed plants by interfering with various physiological and biochemical pathways. Biological methods include crop competition, smother crops, rotation crops, and allelopathy, as well as specific insect predators and plant pathogens. Mechanical methods encompass an array of tools from short handled hoes to sophisticated video-guided robotic machines. Integrating these technologies, in order to relieve the negative impacts of weeds on crop production in a way that allows growers to optimize profits and preserve human health and the environment, is the science of weed management.
Category: Science


Author :
ISBN : CORNELL:31924063041663
Genre : Agriculture
File Size : 34.99 MB
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Category: Agriculture

Potential For Interseeded Cereal And Legume Cover Crops To Control Weeds In Potato Salanum Tuberosum L

Author : Riikka Marjukka Rajalahti
ISBN : CORNELL:31924080073210
Genre :
File Size : 67.83 MB
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Studies were conducted: (1) to evaluate the effect of time of hilling and interseeding of cereal and legume cover crops on weed suppression and yield of potatoes; (2) to determine the potential for managing cover crop competition with potato by varying seed placement technique and seeding rate; and (3) to evaluate control of oats, barley, and large crabgrass by fluazifop, sethoxydim, or the combination of fluazifop and metribuzin, as well as control of redroot pigweed, common lambsquarters, and hairy vetch by metribuzin alone or in combination with fluazifop. Weed control and yields with earlier hilling and interseedings were higher than with later interseeded cover crops. When cereals were interseeded 3 or 4 wk after planting (WAP) and regulated with herbicides, weed control and yields were equivalent to the chemical standard. The vetches, when regulated, provided adequate weed control and yields only when interseeded 3 WAP. Weed control and yield with red clover was poor in 1995, but in 1996, weed control was equivalent to that achieved with the vetches. Cover crop seeding rate or placement had no significant effect on weed control when hilling/interseeding was performed 5 WAP. In general, however, yields with broadcast planted cover crops tended to be greater than with strip-planting. Graminicides at all rates provided good to excellent control of cereals (3 to 4 leaves) and large crabgrass (5 to 8 leaves), but control of large crabgrass decreased at the 7- to 9-leaf stage. Metribuzin at all rates provided excellent control of both redroot pigweed and common lambsquarters having 3 to 5 leaves. Hairy vetch was suppressed by all rates of metribuzin, but regrowth occurred 9 to 10 days after treatment. No antagonism was noted either by metribuzin or fluazifop. The results indicate that early interseeded cover crops, supplemented with postemergence herbicides, provide good weed suppression with 70% less herbicide (ai/ha), and yields comparable to conventional potato production. Planting method and seeding rate, however, did not effect significantly weed suppression or yield when interseeding was done 5 WAP. When competitive, cover crops can be regulated with lower-than-labeled rates of graminicides and metribuzin, assuming weeds present in the field are not too large size.

Physiology Of Stressed Crops Vol 3

Author : U S Gupta
ISBN : CORNELL:31924102066655
Genre : Technology & Engineering
File Size : 71.48 MB
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Research on the physiology of crops under stress is of relatively recent origin and still in the stage of information building; practical use of the information gathered is yet to be made. Research on allelopathy and use of allelochemicals is one such example. The majority of work done focuses on the detrimental effects of living plants and their residues on crop growth, yield and quality, and little attention has been paid, that too only in the last 15-20 years, on making gainful use of this nature?s self defence mechanism, both by crops for weeds and weeds for crops, and so on. In this volume, unlike other books and symposium-volumes, efforts have been made to understand the problem and concentrate on aspects such as autotoxicity, crop-crop interference, crop-weed interference, weed-crop interference etc. for better understanding of the problems of monoculture, ratooning, crop rotation, mixed or strip cropping, mulching and weed smothering, etc. Further, the possibility of developing environment-friendly bi
Category: Technology & Engineering

Management Of Arid Ecosystem

Author : A. S. Faroda
ISBN : UOM:39015049631727
Genre : Arid regions
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The Arid Ecosystem Has Been Under Constant Pressure Of Biotic And Abiotic Stresses All Through The Millennium. In The Last Few Decades There Has Been Acute Resource Depletion Of The Already Fragile Ecosystem Through Over-Exploitation Of Resources By The E
Category: Arid regions

The Chemistry Of Allelopathy

Author : Alonzo C. Thompson
ISBN : UOM:39015010072224
File Size : 21.88 MB
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Allelopathic research in agriculture: past highlights and potential; Economics of weed control in crops; Assessment of the allelopathic effects of weeds on field crops in the jumid midsouth; Chemistry and biology of allelopathic agents; The involvement of allelochemicals in the host selection of parasitic angiosperm; Sesquiterpene lactones and allelochemicals from Centaurea species; Fractionation of allelochemicals from oilseed sunflowers; Biosynthesis of phenolic compounds: chemical manipulation in higuer plants; Allelopatic agents form common weeds: Amaranthus palmeri, Ambrosia artemisiifolia, and related weeds; Allelopatic agents from Parthenium hysterophorus and Baccharis megapotamica; Effects of allelochemicals on plant-water relationships; Mechanisms of allelopatic action in biossay; Phytotoxic compounds isolated and identified from weeds; Phytotoxicity of root exudates and leaf extracts of nine plant species; The effect of root exudates on soybeans: germination, root growth, nodulation, and dry-matter production; Rye (Secale cereale L.) and wheat (Triticum aestivum L.) mulch: the suppression of certains broadleaved weeds and the isolation and identification of phytotoxins; Allelopatic in tall fescue; Germination regulation by Amaranthus palmeri and Ambrosia artemisiifolia; The influence of secondary plant compounds on the associations of soil microorganisms and plant roots; Antimicrobial agents from plants: a model for studies of allelopathic agents?; A survey of soil microorganisms for herbicidal activity.

Hartmann S Plant Science

Author : Margaret McMahon
ISBN : STANFORD:36105114526879
Genre : Science
File Size : 63.54 MB
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Written by some of the most respected innovators in the field, this comprehensive text takes an in-depth look at the environmental, cultural and social factors that influence how plants are grown and used worldwide. The newest edition cites the most recent statistics, production methods and issues concerning the production and utilization of plants. It offers several web-based resources including a free companion website with practice questions andonline crop fact sheets that give information at a local level. Along with information on climate and environment, it also explores plants’ tremendous economic impact in both developed and developing nations. Introduces the basics of plant science including the ecosystem; climate; managing soil, water and fertility; and pest management. Examines plant structure, chemistry, growth and development; genetics and biodiversity and their relationship to crop growing and utilization systems. Covers multiple crop types and growth settings including nursery, landscape and greenhouse. Also discusses how crops are preserved, transported and marketed. For anyone interested in how plants are cultivated and utilized.
Category: Science