Wheat Weed Competition
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Wheat Weed Competition
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Author : Pejman Behdarvand
language : en
Publisher: LAP Lambert Academic Publishing
Release Date : 2013
Wheat Weed Competition written by Pejman Behdarvand and has been published by LAP Lambert Academic Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
This book is an outcome of research carried out for 5 years at Department of Botany, University of Pune, India in association with Department of Agricultural and Natural Resources, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran. The research was focused on interspecific competition and allelopathic effects of wild mustard and wild oat on growth and productivity of wheat. The book encompasses six chapters. Chapter-I is focused on weed-crop competition and factors influencing weed competition. Chapter-II is highlighting the previous work on this aspect on different food grains crop including wheat. Chapter-III includes the various types of methodology used, experimental design, crop density, weed density and nitrogen levels applied. Chapter-IV is focused on results of the different field, pot and Phytoextract bioassay experiments. Chapter-V is devoted to discuss the results and probable morpho-physiological characteristics of wheat competition ability of wheat, wild mustard and wild oat influeced by various dosses of nitrogen fertilizer. Chapter-VI, summary and conclussion are given in nutshell in last chapter. This book will be a guidline for agro-physiologist and weed biologist
Managing And Breeding Wheat For Organic Systems
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Author : Muhammad Asif
language : en
Publisher: Springer Science & Business Media
Release Date : 2014-03-19
Managing And Breeding Wheat For Organic Systems written by Muhammad Asif and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-03-19 with Science categories.
Genetically uniform cultivars in many self-pollinated cereal crops dominate commercial production in high-input environments especially due to their high grain yields and wide geographical adaptation. These cultivars generally perform well under favorable and high-input farming systems but their optimal performance cannot be achieved on marginal/organic lands or without the use of external chemical inputs (fertilizers, herbicides and pesticides). Cereal breeding programs aim at evaluating candidate lines/cultivars for agronomic, disease and quality traits in a weed free environment that makes it impossible to identify traits conferring competitive ability against weeds. Moreover, quantification of competitive ability is a complex phenomenon which is affected by range of growth traits. Above (e.g. light) and below (e.g. water and nutrients) ground resources also influence competitiveness to a greater extent. Competitiveness is quantitatively inherited trait which is heavily influenced by many factors including genotype, management, environment and their interaction. Sound plant breeding techniques and good experimental designs are prerequisites for maximizing genetic gains to breed cultivars for organically managed lands. The brief is focused on breeding wheat for enhanced competitive ability along with other agronomic, genetic and molecular studies that have been undertaken to improve weed suppression, disease resistance and quality in organically managed lands. The examples from other cereals have also been highlighted to compare wheat with other cereal crops.
The Influence Of Weed Competition And Control On Wheat Yields In Arkansas
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Author : Khosro Khodayari
language : en
Publisher:
Release Date : 1980
The Influence Of Weed Competition And Control On Wheat Yields In Arkansas written by Khosro Khodayari and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Herbicides categories.
Crop Weed Competition Studies In Wheat Triticum Aestivum L
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Author : Surjit Singh Dahiya
language : en
Publisher:
Release Date : 1994
Crop Weed Competition Studies In Wheat Triticum Aestivum L written by Surjit Singh Dahiya and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.
Competitive Effects And Control Of Weeds In Winter Wheat On The Anatolian Plateau Turkey
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Author : Cengiz Tezel
language : en
Publisher:
Release Date : 1975
Competitive Effects And Control Of Weeds In Winter Wheat On The Anatolian Plateau Turkey written by Cengiz Tezel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Wheat categories.
Wheat is the major crop produced on the Anatolian Plateau of Turkey. Annual weeds cause large yields reductions in the wheat crop. Several formulations of 2, 4-D and mixtures of 2, 4-D and 2,4, 5-T are the only materials currently available for use in Turkey on wheat. The objective of this study was to determine the optimum time for application of herbicides in order to reduce competition between winter wheat (Triticum aestivum cv. 'Bolal') and annual weeds. Several herbicides and herbicide mixtures were compared for their effectiveness against two major weed species, yellowweed (Boreava orientalis L.) and cornflower (Centaurea cyanus L.). Herbicides were applied at three different dates according to growth stages of wheat and weeds. Two series of handweeded plots were also included. One set allowed weed competition with the wheat for 4 and 8 weeks and was handweeded for the remainder of the season. The other set was kept free of weeds for 4 and 8 weeks and left weedy for the remainder of the season. Weed-free and weedy control plots were included. Wheat which was free from weed competition in the early part of the growing season produced the highest yields. Plots on which herbicides were applied at the earliest date produced higher yields than where herbicides were applied later. Optimum time for herbicide application was when wheat was in the two to three tiller stage and weeds were small, five to six leaf stage. Delaying the application of herbicides beyond the critical period of competition, which is determined by stage of growth of weeds and wheat, resulted in a continuing decrease in wheat yields. Chemicals which produced satisfactory weed control and increased wheat yields were, 2,4-D, 2,4-D + 2,4,5-T, bromoxynil + MCPA, and terbutryn + 2,4-D combinations. The terbutryn + 2,4-D combination needs further research because of possible phytotoxicity to wheat. It was concluded that using only herbicides now available in Turkey, wheat yield increases of 25 to 50% or more are possible by applying herbicides at the optimum time.
Weed Crop Competition
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Author : Robert L. Zimdahl
language : en
Publisher: John Wiley & Sons
Release Date : 2007-11-19
Weed Crop Competition written by Robert L. Zimdahl and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-11-19 with Technology & Engineering categories.
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.
The Effects Of Reduced Nitrogen And Weed Competition On The Yield Of Winter Wheat
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Author : G. Lintell-Smith
language : en
Publisher:
Release Date : 1992
The Effects Of Reduced Nitrogen And Weed Competition On The Yield Of Winter Wheat written by G. Lintell-Smith and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
Broad Leaved Weed Competition With Saudi Wheat Triticum Aestivum Cv Yecora Rojo And Barley Hordeum Vulgare Cv Jasto
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Author : Ameera Ameen Aytah
language : en
Publisher:
Release Date : 2008
Broad Leaved Weed Competition With Saudi Wheat Triticum Aestivum Cv Yecora Rojo And Barley Hordeum Vulgare Cv Jasto written by Ameera Ameen Aytah and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Amaranths categories.
Reduced Nitrogen Inputs In Wheat
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Author : J M. Baylis
language : en
Publisher:
Release Date : 1992
Reduced Nitrogen Inputs In Wheat written by J M. Baylis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with categories.
The Influence On Winter Wheat Yields Of Competitive Weedy Species
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Author : William Edgar Albeke
language : en
Publisher:
Release Date : 1963
The Influence On Winter Wheat Yields Of Competitive Weedy Species written by William Edgar Albeke and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1963 with Agricultural pests categories.
A study was conducted to compare the competitive ability with weeds of the short-strawed Gaines variety wheat and taller growing varieties under different fertility levels at three experimental locations. The experiments were designed so that the effects of variety, nitrogen fertilization, and weed competition could be evaluated. The interactions between these factors were also studied. Ryegrass (Loolium app.) and downy brome (Bromus tectorum) were the two weed species studied. Under high winter rainfall and ryegrass competition yields of wheat were seriously impaired in both the short and tall growing wheat varieties tested. As rates of nitrogen increased yields of wheat did not increase where a medium or heavy stand of ryegrass was present. Yield of wheat was reduced under high nitrogen and high ryegrass competition. A response to 60 pounds of nitrogen per acre was noted where no ryegrass competition was present. One hundred twenty pounds of nitrogen did not increase yields appreciably, especially in the Gaines variety. In the two remaining experiments, response to nitrogen fertilization was not as prominent due to lack of moisture throughout the growing season. However, downy brome competition decreased yields at one location under all three fertility levels. At the other location a poor stand of downy brome and arid conditions accounted for the lack of competitive effects. No differences were noted in competing abilities of the tall vs. the short growing varieties. In general it was concluded that in order to get maximum response from nitrogen fertilization in wheat, weeds would have to be controlled.