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  • 1
    Electronic Resource
    Electronic Resource
    Potential importance of the subsoil for the P and Mg nutrition of wheat (1991)
    Springer
    Plant and soil 137 (1991), S. 259-266 
    Details
    ISSN: 1573-5036
    Keywords: P uptake ; Mg uptake ; spring wheat ; subsoil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A method is described which allowed the quantification of the potential uptake of P and Mg from the subsoil (〉30cm) by spring wheat. Wheat was grown on an artificial topsoil (sand with no plant available P or Mg) which was superimposed on loess subsoils in N. Germany. The supply of P and Mg in the topsoil was varied by application of different quantities of P and Mg fertilizer. Uptake of P and Mg from the subsoil was calculated as the difference between total plant uptake (determined by plant analysis) and the quantities of P and Mg removed from the topsoil (determined by soil analysis). P uptake from the subsoil increased from 37% to 85% of total P uptake, with decreasing P supply in the topsoil. Calculations of potential supply by diffusion showed that, with a CAL-extractable P2O5 content in the subsoil of 9 mg 100g-1, supply from the subsoil was only possible if the influence of root hairs was considered. The method also showed that the total demand for Mg by spring wheat could be satisfield from the supply of Mg from the subsoil of typical loess soils. Mg uptake from the subsoil decreased to 33% of total uptake with increasing Mg supply in the topsoil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00011204
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  • 2
    Electronic Resource
    Electronic Resource
    Bestimmung des O/U-Verhältnisses von nichtstöchiometrischem Urandioxid mit Hilfe der Spektralphotometrie (1973)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 267 (1973), S. 103-105 
    Details
    ISSN: 1618-2650
    Keywords: Best. des O/U-Verhältnisses von nichtstöchiometr ; Urandioxid ; Spektralphotometrie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Eine Methode zur Bestimmung des Sauerstoff-Metall-Verhältnisses von überstöchiometrischem Urandioxid wird beschrieben. Nach Auflösen des Urandioxids in heißer konzentrierter Phosphorsäure werden die Konzentrationen an U4+ und U6+ über die Messung der Extinktionen zweier spezifischer Wellenlängen bestimmt. Die Methode zeichnet sich durch Einfachheit und geringen Zeitaufwand aus. Sie wurde für O/U-Verhältnisse von 2,05–2,67 getestet. Die Reproduzierbarkeit beträgt, bezogen auf das O/U-Verhältnis, ±0,005.
    Notes: Abstract After dissolution of the sample in hot concentrated phosphoric acid the concentrations of U4+ and U6+ are measured via the absorbance of two specific wavelengths. The method is simple and requires little time. It has been tested for 0/U ratios 2.05 to 2.67. The reproducibility, related to the O/U ratio, is ± 0.005.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00429960
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Zur Stabilität turbulenter Diffusionsflammen in BrennkammernHerrn Prof. Dr. H. Kroepelin zum 65. Geburtstag (1966)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 38 (1966), S. 1260-1264 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Turbulente, mehrstrahlige Diffusionsflammen werden in Industrie und Technik vielfach angewandt. Am Beispiel einer Modellbrennkammer wird der Strömungsverlauf der Brenngas- und Luftstrahlen aufgezeigt. Untersuchungen über die Stabilität und die Vermischungsvorgänge der Diffusionsflamme in Abhängigkeit von geometrischen Größen der Brennkammer geben Hinweise auf den zweckmäßigen Bau Größerer Anlagen.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330381205
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    Paper (German National Licenses)
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