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  • N2 fixation  (3)
  • 81.15  (2)
  • Springer  (5)
  • 1990-1994  (5)
  • 1965-1969
Collection
Keywords
Publisher
  • Springer  (5)
Years
  • 1990-1994  (5)
  • 1965-1969
Year
  • 1
    Electronic Resource
    Electronic Resource
    Nitrogen accumulation in three legumes and two cereals with emphasis on estimation of N2 fixation in the legumes by the natural 15N-abundance technique (1990)
    Springer
    Biology and fertility of soils 9 (1990), S. 25-30 
    Details
    ISSN: 1432-0789
    Keywords: N2 fixation ; Natural 15N abundance ; N-difference method ; Atmosphere-derived N ; Non-nodulating genotype
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary N accumulation and natural 15N abundance in three legumes (groundnuts, cowpeas, and soybeans) and in two cereals (sorghum and maize) were investigated over two seasons in Alfisols with and without N fertilization. Using the N uptake and natural 15N abundance of non-nodulating plants as the indication of N derived from soil and fertilizer, the per cent N derived from atmospheric N2 was calculated for nodulated plants. In the first experiment, the groundnut genotype contained 85% atmosphere-derived N, but the percentage decreased with N application. Estimates of atmosphere-derived N by the N-difference and 15N-abundance techniques gave identical results. The percentages of atmosphere-derived N estimated by the two methods at different stages of groundnut growth were also similar. In the second experiment, atmosphere-derived N was estimated in plants grown with 0–200 kg ha-1 applied N. The estimated atmosphere-derived N ranged from 42% to 61% for groundnuts from 33% to 77% for cowpeas, and from 24% to 48% for soybeans, depending on the amount of N applied. Inoculation with a Bradyrhizobium strain increased the percentage of atmospherederived N in soybean plants grown without any fertilizer N. The natural 15N abundance of sorghum and maize was very close to that of the non-nodulating groundnut, suggesting that these cereals can be used as reference plants in the estimation of atmosphere-derived N by the natural 15N-abundance method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335857
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  • 2
    Electronic Resource
    Electronic Resource
    Epitaxial growth of lattice mismatched SrF2 films on (100) GaAs (1992)
    Springer
    Applied physics 54 (1992), S. 284-287 
    Details
    ISSN: 1432-0630
    Keywords: 81.10 ; 81.15 ; 68.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract For the first time insulating epitaxial SrF2 films on (100) GaAs substrates have been grown by thermal deposition followed by in situ annealing process. Structural properties of SrF2 films examined by X-ray diffraction, scanning electron microscopy and transmission electron microscopy indicate a very good crystalline quality. It is observed from the X-ray analysis that SrF2 layers thinner than 100 nm suffer two dimensional compressive stress due to the lattice misfit while those thicker than 100 nm suffer two dimensional tensile stress due to the difference in the thermal expansion coefficients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323851
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  • 3
    Electronic Resource
    Electronic Resource
    Electrical properties of polyimide on n-GaAs (100) interfaces by a pulsed laser evaporation technique (1993)
    Springer
    Applied physics 56 (1993), S. 353-354 
    Details
    ISSN: 1432-0630
    Keywords: 73.40 ; 81.10 ; 81.15
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Incorporation of a thin insulating layer of polymer-like polyimide deposited by pulsed laser evaporation technique between metal and n-GaAs has resulted in diode structures with MIS and Schottky-barrier-type capacitance-voltage and current-voltage characteristics. These structures have the potential to be useful in improving the performance of GaAs FETs for microwave and high-speed applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324355
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  • 4
    Electronic Resource
    Electronic Resource
    Comparative salinity tolerance of symbiotically dependent and nitrogen-fed pigeonpea (Cajanus cajan) and its wild relative Atylosia platycarpa (1990)
    Springer
    Biology and fertility of soils 10 (1990), S. 11-16 
    Details
    ISSN: 1432-0789
    Keywords: Atylosia platycarpa ; Cajanus cajan ; Pigeonpea ; N2 fixation ; Rhizobium ; Salinity stress ; Acetylene reduction assay
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Once symbiosis between the pigeonpea cultivar ICPL 227 and the Rhizobium sp. strain IC 3024 is established, it is efficient in fixing N2 under saline conditions and can support growth comparable to N-fed plants in growth media with up to 6 dS m-1 salinity. However, the early stages of establishment of the pigeonpea-IC 3024 symbiotic system have proved sensitive to salinity. The present study showed that the number of nodules was markedly reduced at 8 dS m-1 salinity; however, nodule development and functioning were not affected by salinity in the pigeonpea-IC 3024 symbiosis. The symbiotic system of Atylosia platycarpa and Rhizobium sp. strain IC 3087 was established successfully even at 12 dS m-1 and supported growth comparable to that of N-fed plants. P levels in leaves were increased under saline conditions in N-fed and N2-fixing pigeonpea and A. platycarpa. There were no consistent differences in the leaf Na and chloride levels between N-fed and N2-fixing plants of pigeonpea and A. platycarpa. The present study suggests that the rhizobial symbiosis may not be a necessary factor for initial screening of pigeonpea and related wild species for salinity tolerance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336118
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  • 5
    Electronic Resource
    Electronic Resource
    Use of blue-green algae and bryophyte biomass as a source of nitrogen for oil-seed rape (1990)
    Springer
    Biology and fertility of soils 10 (1990), S. 61-64 
    Details
    ISSN: 1432-0789
    Keywords: Blue-green algae ; N2 fixation ; Oil-seed rape ; Organic matter ; Productivity ; Wetland rice soil ; Nostoc muscorum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Blue-green algal (Nostoc muscorum) or bryophyte (Barbula recurvirostra) growth on the surface of a brown earth silt loam contained in flooded columns significantly increased soil C (+20.9% and ±23.0%, respectively) and soil N (+25.1% and +9.6%, respectively) after 5 weeks in the surface 0.7-cm soil layer. Differences in the lower layers were not significant since there was no movement of C or N metabolites down the profile, even after 21 weeks. The input of C by the inoculated blue-green algae was estimated at 0.48 Mg C 100-1 g soil or 0.45g C ha-1; the bryophyte growth gave 0.5 Mg C ha-1. N fixation by the blue-green algae alone was estimated at 60 kg N ha-1 after 5 weeks of growth. Blue-green algae associated with bryophyte growth had fixed 23 kg N ha-1 after 5 weeks, rising to 40 kg ha-1 after 21 weeks. Decomposition of the bryophyte biomass led to a significant increase in the dry weight (+16.8%) and the N uptake (+27.5%) of spring oil-seed rape planted in homogenised soil. In contrast, soil incorporation of the blue-green algal biomass had no significant effect on yield. The equivalent mineralized N from the blue-green algal and bryophyte incorporation was estimated as 24 and 58 kg N ha-1, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336126
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