Determining the Potential for Increased Nitrogen Fixation by Alfalfa Cultivatars PDF Download
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Author: John Harold Stangarone
Publisher:
ISBN:
Category :
Languages : en
Pages : 268
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Author: John Harold Stangarone
Publisher:
ISBN:
Category :
Languages : en
Pages : 268
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Author:
Publisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 20
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Uit onderzoek aan bestaande alfalfa-rassen blijkt een stimulerend effect op het volggewas, vergelijkbaar met 112 kg kunstmeststikstof per ha. Drie alfalfa-typen werden geselecteerd op een verhoogde acetyleen-reductie en onderzocht op de in de titel genoemde aspecten
Author: Bill Melton
Publisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 26
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Author: D. J. Undersander
Publisher:
ISBN: 9780891181798
Category : Alfalfa
Languages : en
Pages : 0
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The Alfalfa Management Guide is designed especially for busy growers, with to-the-point recommendations, useful images of diseased plants and pests, and quick-reference tables and charts. Revised in 2011, this edition of Alfalfa Management Guide covers the latest strategies for alfalfa establishment, production, and harvest-soil testing, fertilizing, integrated pest management, rotation, and more.
Author:
Publisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 24
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Author: Meiyu Mao
Publisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 216
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Agrobacterium rhizogenes has been shown to cause root proliferation and increased water use efficiency in certain woody dicots. Root proliferation may be desirable in herbaceous legumes as a means of increasing potential sites for infection by Rhizobium species and subsequent nodulation and nitrogen fixation. Thus, A. rhizogenes was used to inoculate a series of forage legumes to evaluate its ability to stimulate root activity. Growth chamber experiments were conducted in which plants were grown in plant tubes with nutrient agar. Plants were evaluated for root development six weeks after inoculation. The preliminary experiment showed that alfalfa treated with A. rhizogenes 232 produced a significantly (159%) greater number of roots, twice the root volume, 183% greater root fresh weight, and 214% more root dry weight than the uninoculated treatment. In white clover and field pea, however, A. rhizogenes 232 did not produce significantly increased root number or root mass. This experiment indicated that A. rhizogenes was effective in stimulating increased root initiating activity in alfalfa. The positive effects of A. rhizogenes 232 on the initial growth of alfalfa roots led to experiments to evaluate A. rhizogenes's ability to stimulate root activity and the effectiveness of a R. meliloti transconjugant (pRi) in increasing nodulation and biological nitrogen fixation. The R. meliloti (pRi) transconjugant was formed by introducing the Ri plasmid from A. rhizogenes into R. meliloti. This R. meliloti transconjugant BL105-9 was used to inoculate two alfalfa (Medicago sativa) cultivars (Ladak 65 and Vernema) to evaluate its effectiveness for increased nodulation and biological nitrogen fixation. Strain effectiveness was determined following six weeks in plant tubes containing nutrient agar in a growth chamber experiment. Although the R. meliloti transconjugant (BL105-9) did not produce significantly more root or shoot mass than the R. meliloti parent (BL116), it did produce significantly (72.8%) more nodules and 99.2% more nodule dry weight. No significant difference in either total plant nitrogen level or acetylene reduction rate was observed between the R. meliloti transconjugant and the parent strain. Thus, this experiment indicates that introduction of the hairy root plasmid into R. meliloti resulted in increased nodulation of alfalfa, but this increased nodulation was not translated into increased total plant nitrogen or increased dry matter production.
Author: Pilar Irisarri
Publisher: Frontiers Media SA
ISBN: 2889740447
Category : Science
Languages : en
Pages : 209
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Author: Saad Sulieman
Publisher: Springer
ISBN: 3319062123
Category : Science
Languages : en
Pages : 136
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The world population will grow more rapidly during the few coming years. This must be accompanied by a parallel increase in the agricultural production to secure adequate food. Sustainability considerations mandate that alternatives to chemical nitrogen fertilizers must be urgently sought. Biological nitrogen (N2) fixation, a microbiological process which converts atmospheric N2 into a plant-usable form, offers this alternative. Among these renewable sources, N2-fixing legumes offer an economically attractive and ecologically sound means of reducing external inputs and improving internal resources. Environmental factors such as drought, elevated temperature, salinity, soil acidity and rising CO2 are known to dramatically affect the symbiotic process and thus play a part in determining the actual amount of nitrogen fixed by a given legume in the field. Understanding how nodule N2 fixation responds to the environment is crucial for improving legume production and maintaining sustainability in the context of global change. In this thoughtful and provocative new Brief, we provide critical information on how current and projected future changes in the environment will affect legume growth and their symbiotic N2 fixing capabilities. Each section reviews the main drivers of environmental change on the legume performance that include drought, elevated temperature, salinity and rising CO2, and soil acidity. Importantly we discuss the molecular approaches to the analysis of the stress response in legumes and the possible biotechnological strategies to overcome their detrimental effects.
Author: Gordon A. Lymbery
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 192
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Author: Mark William Seetin
Publisher:
ISBN:
Category : Alfalfa
Languages : en
Pages : 90
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