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  • 1975-1979  (2)
  • 1970-1974  (4)
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  • 1
    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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  • 2
    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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  • 3
    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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  • 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
    Influence of straw and CO2 on N2-fixation and yield of field-grown soybeans (1978)
    Springer
    Plant and soil 49 (1978), S. 259-266 
    Details
    ISSN: 1573-5036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Straw incorporation at 2 and 4 t/ha with or without CO2-enrichment at 1000 mg/l from flowering to pod development stage in open top chambers markedly influenced the N2-fixation and yield of field grown soybeans. N2-ase activity of soybean root nodules as determined by acetylene reduction technique indicated that (1) straw on average gave significantly 141 and 197% higher N2-ase activity at 2 and 4 t/ha respectively than controls; (2) CO2 treatments on average increased the activity by 24% over those without CO2 and (3) 4 t/ha straw alone or straw at 2 or 4 t/ha in conjunction with CO2 increased the N2-ase activity four-fold over the control. High correlations were observed between fresh weights of nodules and N2-ase activity and between fresh weights of nodules and yield and between N2-ase activity and yield. This study confirms the earlier investigation that straw could be considered to provide a partial substitute for expensive CO2-enrichment treatment for improving N2(C2H2) fixation and thereby the general growth and yield of crops.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02149735
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of amendments, moisture and temperature on acetylene reduction in nile delta soils (1979)
    Springer
    Plant and soil 51 (1979), S. 27-37 
    Details
    ISSN: 1573-5036
    Keywords: Bacteria ; Asymbiotic ; N-fixers ; Azotobacter ; Clostridia ; Straw ; N-fixation ; Nitrogenase ; Nile delta soil ; Environment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The pattern of N2-ase activity in clay-loam soil of Nile Delta was determined. However, unamended soil showed somewhat low activity: an amount of 18–95 mg N2 fixed/kg soil/year was calculated. Addition of glucose greatly enhanced such activity and efficiencies of N2-fixation increased with decreasing carbon source concentration. Highest activities (800 n moles C2H4/gh−1) and efficiencies (18.06 mg N2/g glucose added) were reported in soil amended with 1% glucose, adjusted to 50% W.H.C. and incubated at 30°C. Enrichment of the soil with straw lead to a significant nitrogen gain particularly under water-logged conditions. During a short period of 16 days 5.8–9.3 mg N2 were fixed/g straw added at the latter conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02205924
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    Paper (German National Licenses)
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