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  • Azospirillum  (2)
  • Triticum aestivum  (2)
  • aerobic incubation  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Effect of combined inoculation of Azospirillum and Rhizobium on nodulation and N"2-fixation of winged bean and soybean
    Amsterdam : Elsevier
    Scientia Horticulturae 20 (1983), S. 231-240 
    Details
    ISSN: 0304-4238
    Keywords: Azospirillum ; N"2-fixation ; Rhizobium ; nodulation ; soybean ; winged bean
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0304-4238(83)90003-1
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Peculiar effect of Azospirillum inoculation on growth and nitrogen balance of winter wheat (Triticum aestivum) (1987)
    Springer
    Biology and fertility of soils 4 (1987), S. 55-59 
    Details
    ISSN: 1432-0789
    Keywords: Azospirillum brasilense ; Triticum aestivum ; Inoculation ; N and dry matter yield ; N percentages in plant parts ; Associative N2 fixation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Wheat plants (Triticum aestivum) grown in pots and in the field under the Mediterranean climate of the south of France were inoculated with a strain of Azospirillum brasilense. Comparisons with non-inoculated plants grown under the same conditions showed significant responses to inoculation with an increase in the number of fertile tillers, shoot and root dry weight, and root to shoot biomass ratio. The roots of inoculated plants attracted relatively more assimilates than those of the control plants until a late stage of growth (heading stage) but the rhizosphere respiration expressed per unit of root growth was not increased by inoculation. Nitrogen yield, both total and in grains, was also enhanced; however, N percentages of all aerial parts of the plants grown in pots were always statistically lower after inoculation than in the control. At maturity, the N % in seeds was 1.81 and 2.45, respectively. The possible mechanisms of this effect of inoculation under the experimental conditions of this study are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00280351
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Occurrence and survival ofAzospirillum spp. in temperate regions (1988)
    Springer
    Plant and soil 110 (1988), S. 213-218 
    Details
    ISSN: 1573-5036
    Keywords: Azospirillum ; identification ; isolation ; population dynamics ; seed inoculation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In order to evaluate the suitability ofAzospirillum spp. as a crop inoculant in temperate regions, the natural occurrence, distribution and survival ofAzospirillum after seed inoculation in Belgian agricultural soils was studied.Azospirillum was present in most of the fields examined, but concentrations never exceeded 1000 cfu per g soil or per g roots. Under field conditions none of the known species was found to be localized inside the roots of barley, wheat, rye, maize or grasses. Also, the distribution ofA. brasilense SpBr 14 within the root system of hydroponic-grown wheat was studied by immunofluorescence. From the rhizosphere samples of the field crops investigated, a number of microaërophilic, diazotrophic bacteria were isolated and identified asA. lipoferum, found only on maize and grass roots, andA. brasilense, present under all crops. In contrast toA. brasilense, A. lipoferum was able to use different amino-acids and some derivatives as sole carbon and nitrogen sources. Use of a peat-based seed inoculant resulted in the establishment of theAzospirillum spp. in the rhizosphere of field-grown winter barley and winter wheat. The established population survived during winter without appreciable change in numbers, but there was no indication of active growth during spring or summer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02226801
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  • 4
    Electronic Resource
    Electronic Resource
    Failure of an iterative curve-fitting procedure to successfully estimate two organic N pools (1997)
    Springer
    Plant and soil 195 (1997), S. 121-128 
    Details
    ISSN: 1573-5036
    Keywords: aerobic incubation ; C and N mineralization ; crop residues ; soil organic matter pools ; Stanford and Smith
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Fitting a double negative exponential function to N mineralization data can be used to characterize two organic nitrogen pools; an ‘easily’ decomposable (Ndpm) and a ‘resistant’ one (Nrpm). The relevance of those two calculated N mineralization pools was investigated by adding ‘easily’ decomposable organic material to soils. Soil amended with crop residues of sugar-beet or bean was mixed with an equal amount of coarse sand, incubated at 35 °C and leached at specific time-intervals. Upon leaching, NH4 + and NO3 - were measured in the extracts. A double negative exponential function was fitted to the data and two organic N pools were defined. Fitting a double negative exponential function to N mineralization data to characterize an active and resistant organic N pool was sometimes impossible; the N mineralization data did not always resemble a negative exponential function. Additionally, the size of the two pools calculated were not constant with time and were often meaningless; the Nrpm pool was greater than the soil organic N content, the size of the Nrpm pool was smaller than the Ndpm pool or one of the N pools was negative. Relevant values for both Nrpm and Ndpm which were consistent with incubation time were only obtained when excessive amounts of organic material, normally not dealt with in the field, were applied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004252929840
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  • 5
    Electronic Resource
    Electronic Resource
    Limitations of a calculated N mineralization potential in studies of the N mineralization process (1995)
    Springer
    Plant and soil 177 (1995), S. 175-181 
    Details
    ISSN: 1573-5036
    Keywords: aerobic incubation ; nitrogen mineralization potential ; Stanford and Smith
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Soil is often incubated under controlled conditions to assess its capacity to mineralize nitrogen and to define the N mineralization potential (No) by fitting a negative exponential curve to N mineralization data. The specificity of No for a given soil and its relevance in N mineralization studies was examined as part of an overall study of the N mineralization process. Soil mixed with an equal amount of sand was aerobically incubated at 35 °C and leached at specific time intervals. Upon leaching, ammonium and nitrate were measured in the extract. It was found that N mineralization data did not always follow first-order kinetics making it difficult to calculate No. The computed No value was influenced by the shape of the curve, the duration of the incubation experiment and was reciprocally related to the N mineralization constant (kexp). No did not always give an adequate indication of the amount of N mineralized and was not soil specific as the time of sampling largely affected its size. The usefulness of No in the simulation of the N mineralization process with a kexp value valid for all soils was limited and a kexp value specific for each soil was required. A value combining the soil specific No and kexp values and reflecting the amount of N mineralized over one year was proposed as a suitable alternative to the use of No in comparative studies of the N mineralization process. It was concluded that a calculated No could not be used in studies comparing the N mineralization of different soils. In addition, the simulation of the N mineralization required the use of the soil specific kexp and could not be carried out with a kexp valid for all soils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00010123
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  • 6
    Electronic Resource
    Electronic Resource
    Use ofAzospirillum brasilense as biofertilizer in intensive wheat cropping (1982)
    Springer
    Plant and soil 66 (1982), S. 217-223 
    Details
    ISSN: 1573-5036
    Keywords: Azospirillum brasilense ; Biofertilizer ; Spring-wheat ; Triticum aestivum ; Winter-wheat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Three field experiments were conducted on ten cultivars of winterwheat and four cultivars of springwheat to estimate the growth promoting effect ofAzospirillum brasilense under varying nitrogen doses. Independent of cultivar selection or nitrogen dose a highly significant yield increase could be observed in winterwheat: strains S631 and SpBr14 increased the average grain yield with 9.14% and 14.82% respectively. When the yield components were studied a coinciding increase in ear density could be demonstrated of resp. 10.57% and 13.55%. Less significant results were obtained with springwheat although in one experiment strain SpBr14 significantly increased grain yield. As with winterwheat tillering of the plant was markedly affected by inoculation with both strains. In a companion greenhouse experiment it was found that inoculation with Azospirillum can cause a decrease in the root mass of wheatplants except when strain SpBr14 is used. Therefore it is suggested that the presence of a higher tillering together with an undisturbed nutrient uptake capacity can result in yield increases after inoculation withAzospirillum brasilense.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02183980
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    Paper (German National Licenses)
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