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  • Pigeonpea  (3)
  • 81.15  (2)
  • Springer  (5)
  • 1990-1994  (5)
  • 1965-1969
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  • Springer  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Response of the pigeonpea-Rhizobium symbiosis to salinity stress: variation among Rhizobium strains in symbiotic ability (1990)
    Springer
    Biology and fertility of soils 9 (1990), S. 49-53 
    Details
    ISSN: 1432-0789
    Keywords: Cajanus cajan ; Pigeonpea ; Rhizobium variation ; Salinity stress ; Symbiotic nitrogen fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary There were significant differences among pigeonpea [Cajanus cajan (L.) Millsp] Rhizobium sp. strains (IC 3506, IC 3484, IC 3195, and IC 3087) in their ability to nodulate and fix N2 under saline conditions. Pigeonpea plants inoculated with IC 3087 and IC 3506 were less affected in growth by salinity levels of 6 and 8 dS m-1 than plants inoculated with the other strains. For IC 3506, IC 3484, and IC 3195, there was a decrease in the number of nodules with increasing salinity, while the average nodule dry weight and the specific nitrogenase activity remained unaffected. However, in IC 3087, the number of nodules increased slightly with increasing salinity. Leaf-P concentrations increased with salinity in the inoculated plants irrespective of the Rhizobium sp. strain, and leaf-N concentrations decreased with increasing salinity in IC 3484 and IC 3195 only. Shoot-Na and-Cl levels were further increased in these salt-sensitive strains only at 8 dS m-1. Therefore there may be scope for selecting pigeonpea Rhizobium sp. symbioses better adapted to saline conditions. The Rhizobium sp. strains best able to form effective symbioses at high salinity levels are not necessarily derived from saline soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00335861
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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
    Field evaluation of nitrogen fixation and use of nitrogen fertilizer by sorghum/pigeonpea intercropping on an Alfisol in the Indian semi-arid tropics (1994)
    Springer
    Biology and fertility of soils 17 (1994), S. 241-248 
    Details
    ISSN: 1432-0789
    Keywords: Fertilizer use efficiency ; Intercropping ; Natural 15N abundance ; Nitrogen fixation ; Pigeonpea ; Sorghum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A field experiment was conducted to obtain the N balance sheet for sole crops and intercrops of sorghum [Sorghum bicolor (L.) Moench] and pigeonpeas [Cajanus cajan (L.) Millsp.]. Intercropping gave a significant advantage over sole cropping in terms of dry matter production and grain yield, as calculated on the basis of the land equivalent ratio and area-time equivalent ratio. The N fertilizer use efficiency and atmospheric N2 fixation by pigeonpea were estimated using 15N-labeling and natural abundance methods. The N fertilizer use efficiency of sorghum was unaltered by the cropping system, while that of the pigeonpea was greatly reduced by intercropping. Although intercropping increased the fractional contribution of fixed N to the pigeonpeas, no significant difference was observed between the cropping systems in total symbiotically fixed N. There was no evidence of a significant transfer of N from the pigeonpea to the sorghum. This study showed that use of soil N and fertilizer N by pigeonpeas was almost the same as that by sorghum in sole cropping, indicating the potential competence of pigeonpeas to exploit soil N. However, when N was exhausted by a companion crop in intercropping, the pigeonpea crop increased its dependency on atmospheric N2 fixation. We conclude that knowledge of how N from different sources is shared by companion crops is a prerequisite to establishing strategies to increase N use, and consequently land productivity, in intercropping systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00383976
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