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  • 1
    Electronic Resource
    Electronic Resource
    Humic acids stimulate growth and activity of in vitro tested axenic cultures of soil autotrophic nitrifying bacteria (1997)
    Springer
    Biology and fertility of soils 24 (1997), S. 243-248 
    Details
    ISSN: 1432-0789
    Keywords: Key words Ammonia-oxidizing bacteria ; Autotrophic nitrification ; Compost-stabilized waste ; Heterotrophic growth ; Humic acids ; Leonardite ; Nitrite-oxidizing bacteria ; Nitrobacter agilis ; Nitrosomonas europaea ; Soil organic matter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In the present study, the effect of humic acids on activity and growth of Nitrosomonas europaea and Nitrobacter agilis was investigated in vitro under axenic conditions. Humates from compost-stabilized vegetable waste or leonardite were added to the chemolithotrophic culturing medium at concentrations of 0, 5, 50 and 100 mg l–1. It was found that both types of humic acids increased either NH4 + or NO2 – oxidation and cell growth of nitrifying bacteria in a dose-independent manner. By combining these results with data from a comparative growth evaluation of N. agilis based on possible utilization of humates or pyruvate in heterotrophic conditions, evidence was obtained that nitrifiers cannot use humic acids as an alternative carbon and energy source. Thus, the stimulating effect of this fraction of soil organic matter on chemolithotrophic ammonia and nitrite oxidizers might be attributed to an increase in microbial membrane permeability favouring a better utilization of nutrients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050238
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  • 2
    Electronic Resource
    Electronic Resource
    Influence of humic acids on laurel growth, associated rhizospheric microorganisms, and mycorrhizal fungi (1993)
    Springer
    Biology and fertility of soils 16 (1993), S. 1-4 
    Details
    ISSN: 1432-0789
    Keywords: Glomus mosseae ; Humic acids ; Laurus nobilis ; Rhizospheric microorganisms ; Vesicular-arbuscular mycorrhizae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Increasing concentrations of humic acids were tested in order to determine their effects on the microbial rhizosphere and the growth of laurel (Laurus nobilis L.). Plants that were treated with 300 mg kg-1 of humic acids had the heaviest weights of both fresh and dry shoots; however, doses of 3000 mg kg-1 were highly phytotoxic and inhibited the growth of laurel. Total aerobic bacteria and actinomycetes were stimulated by doses of 1500 and 3000 mg kg-1 of humic acids at the first harvest. Nevertheless, at the end of the experiment no significant differences were found among the different doses. The number of fungi living in the laurel rhizosphere was not affected by any concentration of humic acids. Vesicular-arbuscular mycorrhizal (VAM) colonization was only slightly affected by the addition of increasing concentrations of humic substances to the soil, while the hyphal growth of Glomus mosseae was reduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336506
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