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  • 1985-1989  (2)
  • 1988  (2)
  • Azolla  (1)
  • Azolla pinnata  (1)
  • Compositae
  • 1
    Electronic Resource
    Electronic Resource
    Symbiotic algal nitrogenase activity and heterocyst frequency in sevenAzolla species after phosphorus fertilization (1988)
    Springer
    Hydrobiologia 169 (1988), S. 313-318 
    Details
    ISSN: 1573-5117
    Keywords: Azolla ; symbiont ; Anabaena azollae ; heterocyst ; acetylene reducing activity ; phosphorus ; fertilization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Seven species ofAzolla (A. caroliniana, A. microphylla, A. nilotica, A. filiculoides, A. mexicana, A. rubra, A. pinnata the last from both Malaysia and India) grown in pots of flooded soil were subjected to three different treatments with respect to P: none, single application, split application. The experiments were carried out under greenhouse conditions. Heterocyst frequency inAnabaena azollae and acetylene reducing activity (ARA) were studied in successiveAzolla leaves. Both variables increased from the first leaf (shoot apex) to the last one (before branch) in all species in the presence or absence of P. However, heterocyst frequency, ARA andAzolla biomass were all less in the treatment lacking P. Heterocyst frequency inA. azollae, ARA and biomass ofAzolla were higher when P was applied in split doses than in the other treatments.Azolla plants exhibited more ARA than the isolated leaves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00007554
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Effect of different nitrogen sources on growth, acetylene reduction activity ofAzolla pinnata and yield of rice (1988)
    Springer
    Plant and soil 107 (1988), S. 165-171 
    Details
    ISSN: 1573-5036
    Keywords: acetylene reduction activity ; Azolla pinnata ; fresh biomass ; N-sources ; N-uptake ; total crop
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effect of nitrogenous sources like ammonium sulphate (AS), prilled urea (U), urea super granule (USG) and farm yard manure (FYM) was studied on the fresh biomass (FB) and acetylene reduction activity (ARA) ofAzolla pinnata, R. Brown (Bangkok isolate), grown as a dual crop with rice, and rice yield in three successive seasons. Irrespective of the N-sources and seasons, the FB and ARA of Azolla were observed to be maximum on 14th day after Azolla inoculation (DAI). The different N-sources had significant effect on the ARA and to a lesser extent on the FB of Azolla. The treatment without fertilizer-N (control) exhibited highest ARA, FB and total N-content of Azolla. These were inhibited to a lesser extent by USG and FYM, though used at higher rates of 75 kg N ha−1 and 90 kgN ha−1 respectively, compared to that by AS and U, used at lower rates of 45kg N ha−1 each.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02370543
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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