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  • nitrogen content  (2)
  • Streamflow  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Potato micropropagation: Growth of cultivars in solid and liquid media (1996)
    Springer
    Potato research 39 (1996), S. 253-258 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; nitrogen content ; sugar content ; Spunta ; Kennebec ; Huinkul ; nutrient availability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The effect of liquid and solid media on the growth of micropropagated potato shoots (cvs Spunta, Kennebec and Huinkul) was studied in relation to the availability of nutrients and water in the culture medium. Nitrogen and sugar assimilation in the shoot and the water content of the shoots were evaluated. The water content of the plant tissues was not affected by the physical state of the medium. The liquid medium caused a greater accumulation of dry matter in the shoot without changing assimilate partition. The liquid medium increased shoot growth without affecting the number of nodes. The higher growth rate of shoots in liquid medium was correlated with increases in their organic nitrogen and sugar contents, indicating that nutrient assimilation was favoured in liquid media.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02360916
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of nitrogen source on growth and morphogenesis of three micropropagated potato cultivars (1994)
    Springer
    Potato research 37 (1994), S. 161-168 
    Details
    ISSN: 1871-4528
    Keywords: Solanum tuberosum L. ; dry matter partition ; nitrogen content ; DW/Nratio ; nitrate ; ammonium ; glutamic acid ; in vitro nitrogen source
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Different nitrogen sources (NO3 −, NH4 +, glutamic acid and their combinations) influenced the growth and morphogenic responses (node number, shoot length, and stem, leaf and root dry weight) of three micropropagated potato cultivars (Spunta, Kennebec, Huinkul). Addition of reduced nitrogen (NH4 + or glutamic acid) in a nitrate medium increased shoot length and leaf number. The large increase in growth in plants fed with NO3 −, NH4 + could be explained by higher organic nitrogen content and enhanced dry matter partition to the shoot. This suggests that reduced nitrogen source is required, at least as a supplement to NO3 −, to enhance N assimilation and growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02358717
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Comparison of the hydrological characteristics of three small experimental holm oak forested catchments in NE Spain in relation to larger areas (1992)
    Springer
    Plant ecology 99-100 (1992), S. 169-176 
    Details
    ISSN: 1573-5052
    Keywords: Montseny ; Prades ; Quercus ilex ; Streamflow ; Water budget ; Experimental catchment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Precipitation and streamflow have been measured in three small (0.04–0.52 km2) experimental catchments covered by dense holm oak (Quercus ilex L.) forests. Two of them are in the Prades mountains and one in the Montseny mountains (NE Spain). Here we test the hydrological representativeness of these catchments against the streamflow record at two nearby larger (34–60 km2) catchments, one from each massif. Comparisons of (i) annual streamflow, (ii) seasonal distribution of streamflow, and (iii) flow duration curves were made. At Prades, for the period of common record, mean annual precipitation was about 580 mm, and mean annual streamflow 44–81 mm at the two experimental catchments and 102 mm at the larger one. Most streamflow occurred during winter and spring in the three catchments. At Montseny, rainfall was higher, and mean annual streamflow was 495 mm in the experimental catchment, and 760 mm in the larger catchment, though these data were obtained in different periods in each catchment. Streamflow was roughly equal in autumn, winter and spring. At both sites flow duration curves were fairly similar in the small experimental catchments and the larger catchments. The higher streamflow at Montseny is reflected in its flow duration curves being well above those at Prades. The experimental catchments at Prades are thus fairly representative of the larger nearby catchment for the investigated hydrological characteristics. At Montseny, hydrological differences between the experimental catchment and the larger catchment are probably due to the higher mean altitude of the latter and to the non-overlapping periods of their streamflow records.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00118223
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    Paper (German National Licenses)
    Fulltext
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