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  • 1
    Electronic Resource
    Electronic Resource
    Recycling of organic matter through mulch in relation to chemical and microbiological properties of soil and crop yields (1980)
    Springer
    Plant and soil 56 (1980), S. 273-281 
    Details
    ISSN: 1573-5036
    Keywords: Actinomycetes ; Azotobacter ; Alluvial soil ; Available nitrogen ; Available phosphorus ; Bacteria ; Fungi ; Green gram ; Maize ; Mulching ; Organic matter ; Recyling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Field experiments were conducted to investigate the effect of organic mulching on the nutrient status, microbiological properties and the yield of maize and green gram crops. Soil organic carbon and humin and humus carbon of the fallow and the cropped soils were augmented by mulching. More of nitrogen, available phosphorus and ammoniacal and nitrate nitrogen were found in mulched soils. Soil reaction was not affected by mulching. Mulched treatments maintained more of soil moisture and soil temperature lowered during summer and rainy seasons. Population of bacteria, fungi, actinomycetes and Azotobacter were augmented in mulched treatments at all the stages of sampling. Mulching significantly increased the grain and straw yield of both the crops. The nitrogen uptake by grain was higher in mulched than in the unmulched treatments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02205856
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  • 2
    Electronic Resource
    Electronic Resource
    Studies of extraction exchange equilibria. Pb(II)-Cd(II) exchange in the CCl4-xanthate/water system (1995)
    Springer
    Monatshefte für Chemie 126 (1995), S. 1061-1073 
    Details
    ISSN: 1434-4475
    Keywords: Extraction exchange ; Equilibrium quotient ; Exchange reaction constant ; Separation factor ; Activity coefficient ; Thermodynamic equilibrium constant ; Free energy change
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Das Extraktions - Austausch - Gleichgewicht zwischen Cadmiumxanthat in Tetrachlorkohlenstoff und Bleiionen in Wasser beipH 5 bzw. 7.5 und 25±2°C wurde untersucht. Die Austauschisotherme wurde dazu verwendet, den TrennfaktorS Pb/S Cd zu berechnen. Die thermodynamische Gleichgewichtskonstante und die Differenz der freien Energie wurden aus den relevanten analytischen Daten und die Aktivitätskoeffizienten der Elektrolyten in der wässrigen Phase bzw. der durch Xanthat gebundenen Ionen in der Tetrachlormethanphase erhalten. Das nicht-ideale Verhalten der CCl4-Xanthat-Phase wurde ebenfalls dokumentiert. Aus der vorliegenden Studie ergibt sich, daß das Phänomen analog zu Ionenaustauschprozessen in synthetischen organischen Ionenaustauschern behandelt werden kann.
    Notes: Summary An extraction exchange equilibrium between cadmium xanthate in carbon tetrachloride and lead ions in water atpHs 5 and 7.5 was studied at 25±2°C. The exchange isotherm was used to calculate the separation factorS Pb/S Cd. The thermodynamic equilibrium constant and corresponding free-energy change per mole of exchange were calculated using the relevant analytical data and activity coefficients of the electrolyte ions in the aqueous phase and of the xanthate bound ions in the carbon tetrachloride phase. Non-ideal behaviour of the CCl4-xanthate phase was also ascertained. From the present study it appears that the phenomenon may be treated similar to ion-exchange processes in synthetic organic ion exchangers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00811377
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    Paper (German National Licenses)
    Fulltext
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