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  • 2000-2004  (1)
  • 1970-1974  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Establishment of Azorhizobium caulinodans in the rhizosphere of wetland rice (Oryza sativa L.) (2000)
    Springer
    Biology and fertility of soils 31 (2000), S. 143-149 
    Details
    ISSN: 1432-0789
    Keywords: Key words Azorhizobium caulinodans ; Rice ; Inoculum survival ; Inoculum carriers ; Sesbania rostrata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  Azorhizobium caulinodans strongly colonized the rhizosphere of rice plants after incorporation of Sesbania rostrata in a field trial throughout the growing season and during the fallow period until 19 weeks after incorporation of S. rostrata. A. caulinodans became well established in the rhizosphere (7.17 log cfu g–1 dry rice root) and colonized subsequent S. rostrata test plants. Three traditional and three improved high-yielding rice varieties were inoculated with A. caulinodans under gnotobiotic conditions. In none of the combinations did acetylene reduction activity significantly increase. Ethylene production on colonized rice roots only started after the growth medium had been supplemented with an extra C source (0.1 to 0.25% Na-lactate). This indicates that the bacterial nitrogenase activity is limited by energy supply. Four possible inoculant-carriers (peat, coir dust, bagasse, rice straw) were compared for long-term survival of the bacterial strain. Independent of the storage temperature (26  °C or 4  °C), the survival of A. caulinodans in peat and coir dust was very high during a 12-month period (〉8 log cfu g–1 dry carrier), whereas the bagasse and rice straw carriers showed a serious decline from 3 months onwards.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050637
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Assessment of biological nitrogen fixation in grassland and associated sites (1973)
    Springer
    Plant and soil 38 (1973), S. 637-649 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The extent of nitrogen fixation in native grassland on clay soil was measured using the C2H2 reduction assay. Undisturbed soil cores incubated in microcanopies in the field indicated fixation rates of 2 kg N/ha per season. Less nitrogen fixation activity was found in associated cultivated soils. Other sites on different soil associations were found capable of fixing 1 kg·N/ha or less per growing season. The fixation by several legumes and nodulated nonlegumes ranged up to 1.8 μg/cm2. h. Phyllosphere samples of a moss, Ceratodon purpureus Brid reduced appreciable amounts of C2H2. An equivalent of 25 to 110 ng N fixation per hour was found per gram of organic material. C2H2 reduction in the materials used was related to the availability of light and Nostoc spp. were found to be associated with the moss. The major asymbiotic bacteria in the grassland soil were Clostridia although the relationship between numbers of this organism and nitrogen fixation was not significant. Klebsiella spp. were isolated and nitrogen fixation measured with C2H2 reduction and Kjeldahl methods. Both techniques indicated that the isolated bacteria fixed 30 mg N per litre of media during an 8-day incubation period. re]19720704
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00010702
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The influence of some chlorinated hydrocarbon insecticides on the mineralization of N fertilizers and plant growth (1973)
    Springer
    Plant and soil 39 (1973), S. 15-28 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The variable effects, previously observed under field and laboratory conditions, resulting from the application of the widely used chlorinated hydrocarbon insecticides has stimulated further investigations. Because of the possible cumulative harmful effects of the insecticides on the activities of soil micro-organisms, several investigations have been concerned with the influence of these insecticides on the conversion of ammonia to nitrate. The present investigation is concerned with the relationship between the deleterious effect of certain pesticides on the activities of the soil microflora and the use of nitrogenous fertilizers; an aspect of the problem which has not previously been considered. The results of the investigation may allow the anomalous effects of the insecticides in the laboratory and in the field to be understood. The observations indicate that the basis of the effects of hexachlorocyclohexane on soils is as an inhibitor of nitrification.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00018041
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Total soil nitrogen and nitrogen mineralization (1970)
    Springer
    Plant and soil 32 (1970), S. 27-32 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The mineralization capacity of 24 different soils was determined from incubation experiments. Relatively rapid mineralization and nitrification was found with soils from cultivated land, and pastures, but soils under natural vegetative covers of conifers and hardwoods were mostly ammonifying. A close relationship could be established between the total nitrogen content of the soil and the amount of mineral nitrogen formed during incubation. Important connections could also be shown between the available nitrogen contents at different times during the incubation period; these suggest that the incubation period can be considerably shortened.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01372843
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Total soil nitrogen and nitrogen mineralization (1970)
    Springer
    Plant and soil 32 (1970), S. 27-32 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The mineralization capacity of 24 different soils was determined from incubation experiments. Relatively rapid mineralization and nitrification was found with soils from cultivated land, and pastures, but soils under natural vegetative covers of conifers and hardwoods were mostly ammonifying. A close relationship could be established between the total nitrogen content of the soil and the amount of mineral nitrogen formed during incubation. Important connections could also be shown between the available nitrogen contents at different times during the incubation period; these suggest that the incubation period can be considerably shortened.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01372843
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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