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  • Key words Dissolved organic carbon  (1)
  • Manures  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The release and plant uptake of nitrogen from some plant and animal manures (1993)
    Springer
    Biology and fertility of soils 15 (1993), S. 285-293 
    Details
    ISSN: 1432-0789
    Keywords: Manures ; N mineralisation ; N uptake ; 15N ; Added nitrogen interactions ; Priming effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Field and laboratory experiments were used to examine the efficiency of N uptake from various manure forms, and at different rates of application. In a field experiment, wheat was grown on soils with different amounts of 15N-labelled legume residues. The amount of N taken up by the crop was directly proportional to the amount applied, with a recovery of between 15% and 23% of the legume N. In a second field experiment, inorganic N was applied at rates varying from 0 to 120 kg N ha-1 in the presence and absence of poultry manure. The uptake of N by barley was 11 kg ha-1 greater in the manured plots when no inorganic N was applied, and 23 kg ha-1 greater when N was applied at the top rate. N uptake in a pot experiment was again shown to be directly proportional to the rate of manure application, but the amount of N taken up was strongly related to the N content of the manure. An incubation experiment demonstrated that net N mineralisation reached a maximum where residue concentrations were 1,5%. The significance of added nitrogen interactions in the context of manure-N additions is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00337214
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  • 2
    Electronic Resource
    Electronic Resource
    Short-term N availability in response to dissolved-organic-carbon from poultry manure, alone or in combination with cellulose (1999)
    Springer
    Biology and fertility of soils 29 (1999), S. 386-393 
    Details
    ISSN: 1432-0789
    Keywords: Key words Dissolved organic carbon ; Poultry manure ; N availability ; Cellulose ; N turnover
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  Short-term changes in N availability in a sandy soil in response to the dissolved organic carbon (DOC) from a poultry manure (application rate equivalent to approximately 250 kg N ha–1) were evaluated in a 44-day aerobic incubation experiment. The treatments included poultry manure alone and two treatments in which an extra source of C, of low water solubility, was added with the poultry manure in the form of a low (1.05 g kg–1) and a high (4.22 g kg–1) amount of cellulose. All treatments were fertilised with the equivalent of 60 kg N ha–1 of (15NH4)2SO4 in solution. A control treatment consisted of sieved field-moist soil plus 60 kg N ha–1 of (15NH4)2SO4 in solution. Measurements were made of N2O and CO2 emissions, inorganic N, DOC, biomass N, biomass C and labelled N contained in the inorganic N and biomass N pools. The dynamics of N turnover in this study were driven mainly by processes of mineralisation–immobilisation with little significant loss of N by volatilisation or denitrification. The DOC supplied with the poultry manure played a more important role in N2O emissions than differences in C/N ratio. Changes in DOC and cumulative CO2-C production during the first 11 days were also highly correlated (R 2=0.88–0.66, P〈0.01). An initial net immobilisation of N, with significant increases in biomass C and biomass N (P〈0.05) for all treatments over the control at day 11, indicated a high availability of C from the DOC fraction. The presence of additional C from the applied cellulose did not enable a massive N immobilisation. Total inorganic N and unlabelled inorganic N concentrations were highest in soils treated with poultry manure alone (P〈0.05), indicating that an active gross mineralisation of the added poultry manure and a possible positive priming effect were taking place during the incubation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050569
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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