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  • 1
    Electronic Resource
    Electronic Resource
    On the formation of transient (Na"1"9)"2 and (Na"2"0)"2 cluster dimers from molecular dynamics simulations
    Amsterdam : Elsevier
    Physics Letters A 193 (1994), S. 75-81 
    Details
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9601(94)00594-X
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of plant types on release of mineral potassium from gneiss (2000)
    Springer
    Nutrient cycling in agroecosystems 56 (2000), S. 37-43 
    Details
    ISSN: 1573-0867
    Keywords: alfalfa ; gneiss ; Italian ryegrass ; maize ; mineral K ; pak-choi
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The ability of plant types to release mineral K from little weathered gneiss for a mixture of particle size fractions of less than 10 mm, as well as for two separated size fractions (2 mm〈D〈5 mm, and 1 mm 〈D〈2 mm) were compared in pot experiments with maize (Zea mays L. cv. ND60), pak-choi (Brassica campestrisL. ssp.chinensis (L.) Mokina. var. cammunis Tsen et Lee, cv. Wuyueman) and two alfalfa cultivars (Medicago sativa L. cv. Asta and Haifei). Release of mineral K was significantly stimulated by maize, pak-choi and ryegrass, implying a direct mobilization of mineral K by plant roots. The net release of mineral K was greatly influenced by plant species. Among these, the more profound release of mineral K was observed with maize and ryegrass. Besides, the mobilization of mineral K was negatively correlated with the particle size of gneiss. The difference in net release of K from gneiss between two size fractions decreased in the order: maize 〉 ryegrass 〉 pak-choi.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009826111929
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Release of potassium from K-bearing minerals: Effect of plant roots under P deficiency (2000)
    Springer
    Nutrient cycling in agroecosystems 56 (2000), S. 45-52 
    Details
    ISSN: 1573-0867
    Keywords: feldspar ; gneiss ; mineral K ; organic acids ; P deficiency ; rhizosphere
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Pot experiments were conducted, with ryegrass (Lolium perenneL.) maize (Zea mays L ND60) and pak-choi (Brassica campestrisL. ssp.chinensis (L.) Mokina. var. cammunis Tsen et Lee, cv. Wuyueman), to investigate plant mobilization of mineral K in gneiss and feldspar under P-deficient conditions. For both pak-choi and maize grown in gneiss, P-starvation led to a significant increase in K concentration in their shoots, and the net release of K from the mineral K pool was significantly enhanced when the crops grew in feldspar. The enhanced mobilization of mineral K might be attributed to the release of organic acids from the plant roots. When gneiss of various particle sizes was exposed to malic and tartaric acids, both acids had a direct positive influence on the release of mineral K from gneiss. More release of K was observed with increasing concentration of both organic acids, much more so for finer particle size fractions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009894427550
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Phosphorus deficiency enhances root exudation of low-molecular weight organic acids and utilization of sparingly soluble inorganic phosphates by radish (Raghanus satiuvs L.) and rape (Brassica napus L.) plants (1997)
    Springer
    Plant and soil 196 (1997), S. 261-264 
    Details
    ISSN: 1573-5036
    Keywords: organic acid ; phosphate mobilization ; phosphorus deficiency ; radish ; rape ; root exudate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Root exudates were collected from radish and rape plants grown in P sufficient and P deficient nutrient solution. In radish, tartaric, malic and succinic acids were the dominant organic acids which increased between 15 times (succinic acid) and 60 times (malic acid) under P deficient conditions. In another experiment in quartz sand culture supplied with either Ca3(PO4)2 or AlPO4, radish utilized P from AlPO4 much better than from Ca3(PO4)2 whereas the opposite was true for rape. The results demonstrated the role of a particular organic acid in mobilizing sparingly soluble P and were in accordance with the preferential growth of two plants on acid (radish) and calcareous (rape) soils in China.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004214410785
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    Paper (German National Licenses)
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