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  • Electronic Resource  (6)
  • N immobilization  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Effect of ammonium fixation and displacement on the added nitrogen interaction in incubation experiments (1994)
    Springer
    Biology and fertility of soils 18 (1994), S. 99-102 
    Details
    ISSN: 1432-0789
    Keywords: Added N interaction ; Ammonium fixation ; N immobilization ; N mineralization ; Priming effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A laboratory incubation experiment was conducted to study the effect of NH 4 + fixation/defixation on the added N interaction (ANI) in three Illinois Mollisols fertilized with 100 or 200 mg N kg-1 soil. A positive ANI was observed in all three soils, which was greater at the higher rate of applied N. However, very little exchange was observed between applied 15NH 4 + and the native clay-fixed NH 4 + , and the ANI observed were attributed largely to microbial immobilization-mineralization. The results suggested that variations in the NH 4 + fixation capacity of soils will not have a significant bearing on the interpretation of data obtained from studies of the ANI.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336453
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of inorganic nitrogen on the added nitrogen interaction of soils in incubation experiments (1994)
    Springer
    Biology and fertility of soils 18 (1994), S. 103-108 
    Details
    ISSN: 1432-0789
    Keywords: Added N interaction ; N immobilization ; N mineralization ; Mollisols ; Priming effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A laboratory incubation experiment was conducted to study the effect of indigenous inorganic N on the immobilization of applied N and on the occurrence of an added N interaction (ANI). Samples of six Mollisols from Illinois were incubated with 15N-labelled (NH4)2SO4 (100 or 200 mg N kg-1 soil), with or without the use of 0.01 M CaCl2 to extract inorganic N (mainly NO inf3 sup- ) before incubation. From 6 to 49% of the N applied was immobilized, higher percentages being obtained with unextracted soils than with the extracted soils and with the higher rate of N addition. Net mineralization of native N occurred in both the unextracted and extracted soils, but was more extensive in the unextracted soil and increased with the addition of N. The increases were accompanied by a positive ANI, which usually exceeded the amount of applied N immobilized and increased with the rate of addition. The ANI values observed with extracted soils were attributed to increased mineralization of native organic N.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336454
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of ammonium and nitrate on mineralization of nitrogen from leguminous residues (1995)
    Springer
    Biology and fertility of soils 20 (1995), S. 49-52 
    Details
    ISSN: 1432-0789
    Keywords: Nitrification ; N immobilization ; N mineralization ; N interaction ; N-Serve ; Nitrapyrin ; Soil N
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A laboratory incubation experiment was conducted to compare the effects of NH inf4 sup+ and NO inf3 sup- on mineralization of N from 15N-labelled vetch (Vicia villosa Rotn) in an Illinois Mollisol, and to determine the effect of a nitrification inhibitor (nitrapyrin) on mineralization of vetch N when used with NH inf4 sup+ . The addition of either NH inf4 sup+ or NO inf3 sup- (100 and 200 mg N kg-1 soil) significantly increased mineralization of vetch N during incubation for 40 days. The effect was greater with NH inf4 sup+ than with NO inf3 sup- , and a further increase occurred in the presence of nitrapyrin (10 mg kg-1 soil). The addition of NO inf3 sup- retarded the nitrification of NH inf4 sup+ -N derived from vetch.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307840
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  • 4
    Electronic Resource
    Electronic Resource
    Availability of soil and fertilizer nitrogen to wheat (Triticum aestivum L.) following rice-straw amendment (1990)
    Springer
    Biology and fertility of soils 10 (1990), S. 134-138 
    Details
    ISSN: 1432-0789
    Keywords: 15N ; N immobilization ; N loss ; N uptake ; Rice straw ; Soil N ; Wheat ; Triticum aestivum L.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary A pot experiment was conducted to study the N availability to wheat and the loss of 15N-labelled fertilizer N as affected by the rate of rice-straw applied. The availability of soil N was also studied. The straw was incorporated in the soil 2 or 4 weeks before a sowing of wheat and allowed to decompose at a moisture content of 60% or 200% of the water-holding capacity. The wheat plants were harvested at maturity and the roots, straw, and grains were analysed for total N and 15N. The soil was analysed for total N and 15N after the harvest to determine the recovery of fertilizer N in the soil-plant system and assess its loss. The dry matter and N yields of wheat were significantly retarded in the soil amended with rice straw. The availability of soil N to wheat was significantly reduced due to the straw application, particularly at high moisture levels during pre-incubation, and was assumed to cause a reduction in the dry matter and N yields of wheat. A significant correlation (r=0.89) was observed between the uptake of soil N and the dry matter yield of wheat with different treatments. In unamended soil 31.44% of the fertilizer N was taken up by the wheat plants while 41.08% of fertilizer N was lost. The plant recovery of fertilizer N from the amended soil averaged 30.78% and the losses averaged 45.55%
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336249
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  • 5
    Electronic Resource
    Electronic Resource
    Immobilization of ammonium and nitrate and their interaction with native N in three Illinois Mollisols (1993)
    Springer
    Biology and fertility of soils 15 (1993), S. 50-54 
    Details
    ISSN: 1432-0789
    Keywords: Mollisol ; N interaction ; N availability ; N fertilizers ; N immobilization ; N mineralization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Three Illinois Mollisols were incubated for 2 weeks at 25°C after treatment with different amounts of glucose and/or 15N-labelled (NH4)2SO4 or 15N-labelled KNO3. The objectives were: (1) to compare the immobilization and interaction of NH inf4 sup+ −N and NO inf3 sup- −N with the native soil N, and (2) to study the relationship between immobilization of applied N and the added N interaction. As determined, immobilized N refers to forms not extractable with 2 MKCl (immobilized 15N+clay-fixed 15NH inf4 sup+ ). In all cases, both NH inf4 sup+ −N and NO inf3 sup- −N were actively immobilized and transformed into organic forms in the presence of glucose. In the absence of glucose, a higher proportion of NH inf4 sup+ than NO inf3 sup- was recovered in organic forms. Although the three soils differed considerably in the amounts of applied N immobilized, similar trends in N immobilization were observed. A positive added N interaction occurred with all soils, the magnitude increasing with the rate of N addition. In the absence of glucose, higher added N interactions were obtained for NH inf4 sup+ than NO inf3 sup- , whereas there was very little difference between NH inf4 sup+ and NO inf3 sup- in the presence of glucose. The results indicate that under conditions of rapid immobilization (e.g., in the presence of glucose), NH inf4 sup+ and NO inf3 sup- will show comparable interaction with the native soil N, whereas in unamended soil, the extent of this interaction will be greater with NH inf4 sup+ than with NO inf3 sup- . Significant correlations were observed between applied N immobilized and the added N interaction only in one soil having a high initial mineral N content.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336288
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  • 6
    Electronic Resource
    Electronic Resource
    Determination ofin situ KN by the chloroform fumigation-incubation method and mineralization of biomass N under anaerobic conditions (1988)
    Springer
    Plant and soil 111 (1988), S. 87-93 
    Details
    ISSN: 1573-5036
    Keywords: anaerobic incubation ; chloroform fumigation ; microbial biomass ; N immobilization ; N mineralization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A silt loam soil from Pakistan was incubated at 30°C with increasing levels (67, 133, 200, 267 and 333 μg N g−1 soil) of15N-labelled (NH4)2SO4 and glucose (C/N ratio of 30 for all additions). At a stage when all of the applied15N was immobilized (transformed into microbial biomass), moist soil samples were subjected to the chloroform fumigation-incubation method (CFIM) for determination of KN and microbial biomass. Mineralization of biomass derived from the applied15N and the native soil N was studied under anaerobic conditions. In situ values of KN varied from 0.19 to 0.42 and increased with increasing levels of amendment (N + glucose). From 10 to 18% of the native soil N was found as microbial biomass. Anaerobic incubation of the soils resulted in the mineralization (determined as NH 4 + ) of 15.08 to 29.23% of the biomass15N at different levels of amendment; 2.90 to 4.43% of the native soil N was mineralized. From 70 to 90% of the N mineralized from native soil N was derived from microbial biomass; the rest was attributed to non-biomass N.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02182041
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