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  • Articles  (6)
  • Acetylene reduction assay (ARA)  (6)
  • Springer  (6)
  • American Institute of Physics
  • Cell Press
  • Oxford University Press
  • 2010-2014
  • 2005-2009
  • 1985-1989  (6)
  • 1975-1979
  • 1945-1949
  • 2013
  • 2007
  • 2005
  • 1987  (6)
  • 1978
  • Geosciences  (6)
  • Nature of Science, Research, Systems of Higher Education, Museum Science
  • Architecture, Civil Engineering, Surveying
  • Electrical Engineering, Measurement and Control Technology
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  • Articles  (6)
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  • Springer  (6)
  • American Institute of Physics
  • Cell Press
  • Oxford University Press
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  • 2010-2014
  • 2005-2009
  • 1985-1989  (6)
  • 1975-1979
  • 1945-1949
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  • 1
    Electronic Resource
    Electronic Resource
    Nitrogen-fixing stem nodules on Aeschynomene afraspera (1987)
    Springer
    Biology and fertility of soils 4 (1987), S. 61-66 
    Details
    ISSN: 1432-0789
    Keywords: Stem nodulation ; Aeschynomene afraspera ; Legume ; Nitrogen fixation ; Acetylene reduction assay (ARA)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Aeschynomene afraspera is a wild annual legume growing in periodically waterlogged soils in western Africa. This legume is characterized by a profuse stem nodulation. Nodules are formed on the stem at the emergence of lateral root primordia, called nodulation sites. These sites are irregularly distributed on vertical rows all along the stem and branches. Stem nodules are hemispherically shaped. Their outside is dark green and they contain a red-pigmented central zone. Stem nodules exhibit a high nitrogen-fixing potential. Acetylene reduction assays result in stem nodule activity of 309 μmol C2H4 g−1 dry nodule h−1. Field-grown stem nodulated Aeschynomene accumulated more N (51 g N m−2 in 10 weeks) than the root nodulated one. Because of this nitrogenfixing potential and its ability to grow in waterlogged conditions, A. afraspera could probably be introduced into tropical rice cropping systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280352
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of nitrogen on the yield response of Pennisetum americanum, Triticum aestivum and Zea mays to inoculation with Azospirillum brasilense under temperate conditions (1987)
    Springer
    Biology and fertility of soils 4 (1987), S. 67-72 
    Details
    ISSN: 1432-0789
    Keywords: Azospirillum brasilense ; Inoculation ; Nitrogen-fixation ; Effect on yield ; Acetylene reduction assay (ARA) ; Pennisetum americanum ; Riticum aestivum ; Zea mays
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A nitrate-respiring strain, a denitrifying strain, and a non-nitrogen-fixing strain of Azospirillum brasilense were compared for their effect on the growth of pearl millet (Pennisetum americanum), wheat (Triticum aestivum) and maize (Zea mays) under temperate conditions in nitrogen-limited pot cultures. Increases in yield of Z. mays shoots occurred with all three strains when inoculation coincided with the addition of low levels of combined nitrogen. The inoculation of A. brasilense did not show any effect on the yield of P. americanum and T. aestivum. Increased numbers of A. brasilense became associated with Z. mays roots following the addition of low levels of combined nitrogen. Low and very variable rates of acetylene reduction activity were observed from excised roots of inoculated Z. mays plants without preincubation. Results indicate that inoculation of cereals with A. brasilense under temperate conditions has only a limited effect on plant growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280353
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  • 3
    Electronic Resource
    Electronic Resource
    Impact of oil palm (Elaeis guineensis Jacq.) cultivation on some chemical and microbiological properties of an ultisol (1987)
    Springer
    Biology and fertility of soils 4 (1987), S. 167-169 
    Details
    ISSN: 1432-0789
    Keywords: Oil-palm ; Microbiological soil properties ; Impact of cultivation ; Elaeis guineensis ; Ultisol ; Soil algae ; Acetylene reduction assay (ARA)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Soil samples collected from oil-palm (Elaeis guineensis Jacq.) fields of various ages and from adjacent bush fallow were analyzed for macronutrient elements and for total numbers of bacteria and fungi and the most probable number of algae. Nitrogenase activities of soil samples collected from 20-year-old oil-palm plantations were also determined. Oil-palm fields showed increases in total N and total algae but decreases in available P, total C, the base nutrient elements and total bacteria, compared to adjacent bush fallow, but these changes were not statistically significant except for exchangeable Ca. This indicates that oil-palm ecosystems can maintain soil fertility in line with those of fallow lands undergoing soil regeneration in the tropics. Oil-palm soil was also nitrogenase positive — an indication of potential N2-fixation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00256992
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  • 4
    Electronic Resource
    Electronic Resource
    Yield response of spring wheat cultivars (Triticum aestivum and T. turgidum) to inoculation with Azospirillum brasilense under field conditions (1987)
    Springer
    Biology and fertility of soils 4 (1987), S. 27-35 
    Details
    ISSN: 1432-0789
    Keywords: Triticum aestivum ; T. turgidum ; Nitrogen fixation ; Field inoculation ; Acetylene reduction assay (ARA)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Eight commercial Israeli spring wheat cultivars (six Triticum aestivum and two T. turgidum) grown with 40 and 120 kg N/ha were tested for responses to inoculation with Azospirillum brasilense. At the low level of N fertilization (40 kg/ha), five cultivars showed significant increases in plant dry weight measured at the milky ripe stage; however, by maturation only the cultivar “Miriam” showed a significant increase in grain yield. Two cultivars, which had shown a positive inoculation effect at the earlier stages, had a significant decrease in grain yield. No significant effect of inoculation was found at the high N level. To confirm those results, four wheat (T. aestivum) cultivars were tested separately over 4 years in 4 different locations under varying N levels. Only Miriam showed a consistently positive effect of Azospirillum inoculation on grain yield. Inoculation increased the number of roots per plant on Miriam compared with uninoculated plants. This effect was found at all N levels. Nutrient (N, P and K) accumulation and number of fertile tillers per unit area were also enhanced by Azospirillum, but these parameters were greatly affected by the level of applied N. It is suggested that the positive response of the spring wheat cultivar “Miriam” to Azospirillum inoculation is due to its capacity to escape water stresses at the end of the growth season.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280347
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of inoculation with different strains of Azospirillum brasilense on cotton (Gossipium barbadense) (1987)
    Springer
    Biology and fertility of soils 4 (1987), S. 91-95 
    Details
    ISSN: 1432-0789
    Keywords: Associative N2-fixation ; Azospirillum brasilense ; Cotton ; Acetylene reduction assay (ARA) ; Root inoculation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The response of the cotton plant to inoculation with six strains of Azospirillum brasilense was investigated under subtropical conditions in Egypt. Azospirilla populations and activities were increased as a result of root inoculation with liquid inoculum of Azospirillum sp. Highest C2H2 — reduction activities on roots were obtained with strains S631 and Sp Br 14 (means of 216.85 and 209.50 nmol C2H4g−1 root h−1 respectively) while strain M4 gave the lowest activity (mean of 100.8 nmol C2H4g−1 root h−1). Statistical analysis showed that Azospirillum strains 5631, Sp Br 14, E15 and SC22 significantly increased the plant dry weight and nitrogen uptake while inoculation with strains M4 and SE had no significant effect in that respect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280357
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  • 6
    Electronic Resource
    Electronic Resource
    Quantitative effects of field water deficits on N2(C2H2) fixation in selected legumes grown in the Indian desert (1987)
    Springer
    Biology and fertility of soils 5 (1987), S. 18-22 
    Details
    ISSN: 1432-0789
    Keywords: Field water deficits ; Acetylene reduction assay (ARA) ; N2-fixation ; Indian desert ; Legumes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The nitrogenase activity of irrigated and rainfed plants of mung bean, cluster bean and moth bean was studied throughout the growth period in order to estimate the reduction in the potential nitrogen fixation (C2H2 reduction) rate due to field water deficits. Nitrogenase activity followed a similar trend in all crops and was dependent on both plant ontogeny and soil moisture levels. The loss of activity due to water deficits varied from 13% to 100% at different growth stages and was related to the plant water potential. The specific activity was directly correlated with the plant water potential under both the treatments. The average loss of nitrogen fixation rate during the season did not differ markedly among crops. There was an accumulation of ureides in the nodules with increasing field moisture stress in mung bean and moth bean while no such effect was found in cluster bean. The significance of these results is discussed in the N-economy of these legumes grown in the drought-prone areas of the Indian desert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00264340
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