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  • 1
    Electronic Resource
    Electronic Resource
    Indigenous and scientific knowledge: the choice and management of cultivation sites by bedouin in Upper Egypt (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 14 (1998), S. 0 
    Details
    ISSN: 1475-2743
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract. This paper investigates the ways in which some bedouin in the Nubian Desert of southeastern Egypt take decisions about both the choice of site for cultivation and the subsequent management of their soils. It explores the complementarity of formal and informal sciences and how each might profitably inform the other. Results show that the bedouin understand the physical limitations and nutrient supply properties of soils, but not aspects such as pH. Decisions on the choice of cultivation site are often made with regard to other perceived risks, such as soil loss and intermittent inundation, rather than just soil quality. It is also apparent that there exists among bedouin a plurality of indigenous knowledge mediated by factors such as experience, wealth levels, household circumstances and production priorities. Understanding indigenous knowledge is essential in helping to develop better use of the soil in this area, about which little is known and which has only a short history of small scale cropping.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1475-2743.1998.tb00159.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Mobility of metals in Egyptian desert soils subject to inundation by Lake Nasser (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Soil use and management 11 (1995), S. 0 
    Details
    ISSN: 1475-2743
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract. Extraction and adsorption techniques were used to study the behaviour of Al, Fe, Mn, Co, Ni, Cu and Zn in soils from around Lake Nasser in the Eastern Desert of Egypt, to assess the potential of such areas for agricultural development and the risks of pollution of the lake. Soil metal contents were very variable, either because of particle size sorting by flowing water or through changes in redox resulting from flooding by lake water. Metal availability was low. Extraction using EDTA and oxalate suggested that mobility of copper was controlled by carbonate, whereas Co, Ni and Zn were controlled by Fe and Mn oxides. Adsorption studies confirmed the strong ability of these soils to remove Cu and Zn from solution, and suggested that Cu and Zn concentrations in solution were controlled by carbonate. Some trace metal fertilizers will probably be required for certain crops, but pollution of the lake by leaching of metals from soil is unlikely. The main process by which metals could be lost from the soil to lake water is a lowering of soil redox potential as a result of flooding by lake water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1475-2743.1995.tb00503.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of cadmium, cobalt, copper, nickel and lead in soil extracts by dithizone extraction and atomic absorption spectrometry with electrothermal atomization
    Amsterdam : Elsevier
    Analytica Chimica Acta 106 (1979), S. 319-324 
    Details
    ISSN: 0003-2670
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0003-2670(01)85015-7
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Geochemical Associations of Sellafield-Derived Radionuclides in Saltmarsh Deposits of the Solway Firth (1998)
    Springer
    Environmental geochemistry and health 20 (1998), S. 95-101 
    Details
    ISSN: 1573-2983
    Keywords: Saltmarsh deposits ; radiocaesium ; plutonium ; selective extraction ; desorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Medicine
    Notes: Abstract This paper describes a study of the geochemical associations of Sellafield waste radionuclides in saltmarsh sediments from south-west s]Scotland. The contaminant radionuclides are transported to this environment in association with particulate material and 137Cs was found to be predominantly (80-98%) non-extractable. In the case of 239+240Pu there was a redistribution from the oxalate extractable oxide fraction to the pyrophosphate extractable organic fraction as a consequence of on-shore transfer of contaminated sediment. The relatively aggressive nature of the chemical extractants required to remove the radionuclides from the sediments suggests that they were in a form which was unlikely to result in their being released into the aquatic environment or taken up by plants. Plutonium had a greater potential mobility or bioavailability than Cs. Values of KD for the desorption of 137Cs from the sediment by freshwater, groundwater and seawater were all approximately 105 L kg-1, confirming its immobility in this environment. The desorption KD values for stable 133Cs were all approximately 106 L kg-1, so the stable Cs did not have a significant influence on the radiocaesium in this sediment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006597809373
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Heavy Metal Toxicity Responses of Two Willow (Salix) Varieties Grown Hydroponically: Development of a Tolerance Screening Test (1999)
    Springer
    Environmental geochemistry and health 21 (1999), S. 359-364 
    Details
    ISSN: 1573-2983
    Keywords: heavy metal tolerance ; phytoremediation ; screening test ; willow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Medicine
    Notes: Abstract The E.U. funded BIORENEW project is investigating bioremediation of industrially degraded land using biomass fuel crops, including willow. One of its goals is to develop a rapid screening test to assess the metal tolerance of large numbers of willow varieties. This should reflect how a plant will respond to heavy metals under various field conditions and in the long term. A preliminary experiment tested two varieties of contrasting ability to thrive in metal-contaminated soils. Trees were exposed to a metal cocktail in three different strengths of background solution. An appropriate strength solution (1/4 strength Hoaglands) was identified for differentiating variety performance, based on its effect on the biomass of plant fractions relative to control fractions. This is a response to heavy metals which can be quantified rapidly and simply. The relative performance of the varieties was comparable to their performance in field studies. This test will be used to assess the tolerance of further varieties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006796720300
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    Paper (German National Licenses)
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