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  • Articles  (2)
  • Other Sources
  • Acetylene reduction  (2)
  • 1980-1984  (2)
  • 1981  (2)
  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (2)
  • Geography
  • Mathematics
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  • Articles  (2)
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  • 1980-1984  (2)
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  • Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Plant and soil 63 (1981), S. 131-139 
    ISSN: 1573-5036
    Keywords: Acetylene reduction ; Fixed-N distribution in plants ; 15N2 reduction ; Phaseolus vulgaris ; Trifolium arvense ; Trifolium badium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Description / Table of Contents: Summary A method for use of15N2 in the study of dinitrogen fixation by complex legumes-Rhizobium associations grown on soil is proposed. The procedure consists in labelling the soil atmosphere with15N2 during short periods of time, measuring15N enrichment in the plants and calculating the total nitrogen fixed during this period. The first results obtained with bean and clover plants demonstrate that after only 7 h of incubation, significative amounts of15N are measured in the plants to allow precise determination of C2H4/N2 ratio which ranged between 2.6 and 3.1 in this experiment. Over longer periods of time, such amounts are meaningfull to follow the pattern of N dynamic from the nodules to the reproductive organs of bean plants.
    Notes: Resumé Les auteurs proposent une méthode d'utilisation du15N2 pour l'étude de la fixation d'azote dans les associations complexes légumineuses-Rhizobium cultivées sur sol. La procédure consiste, à marquer l'atmosphère du sol à l'aide de15N2 et à calculer la quantité d'azote total fixé pendant cette période. Les premiers résultats obtenus sur des haricots et des trèfles démontrent qu'après seulement 7 h d'incubation, des quantités significatives de15N sont mesurées dans les plantes permettant ainsi de déterminer précisément la valeur du rapport C2H4/N2 qui a été établi entre 2,6 et 3,1 dans les conditions de l'expérience. Sur de longues périodes, ces mêmes quantités se sont avérées suffisantes pour suivre la dynamique de l'azote des nodules vers les organes reproducteurs de plants de haricots.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-5036
    Keywords: Acetylene reduction ; Azospirillum ; 15N2 incorporation ; Rice cultivar
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Nitrogen fixation by strains of Azospirillum isolated from several rice soils and rice cultivars was investigated by15N2 incorporation and C2H2 reduction. C2H2 reducing ability markedly varied among the strains obtained from soils differing widely in their physico-chemical properties. Large variations in15N2 incorporation by Azospirillum isolated from the roots of several rice cultivars were also noticed. The present study reveals that rice cultivars harbour Azospirillum with differential N2-fixing ability and that plant genotype is of importance for optimal associations.
    Type of Medium: Electronic Resource
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