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  • 1
    Electronic Resource
    Electronic Resource
    Nitrogen transformation in arable soils of North-West Germany during the cereal growing season (1996)
    Springer
    Biology and fertility of soils 22 (1996), S. 179-183 
    Details
    ISSN: 1432-0789
    Keywords: Key words Microbial N ; Immobilization ; Remobilization ; NH4+ fixation ; Exchangeable NH4+
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In 1991, field experiments on loess (with winter wheat) and sandy soils (with summer barley) were conducted to study N dynamics in the microbial biomass and non-exchangeable NH4 +. The measurements showed a mass change in microbial N, with a maximum increase of 100 kg N ha–1 30 cm–1 from March to July in the loess soil, and a change for only 1 month (May) in the sandy soil. Plots treated with conventional levels of N fertilizer (213 kg N ha–1 on a loess soil to winter wheat and 130 kg ha–1 on the sandy soil to summer barley), reduced levels of N (83% and 62% of the conventional N application), or no N showed no consistent fertilizer N effect on microbial biomass N. From March to July, non-exchangeable NH4 + in loess soils under winter wheat decreased by 110 kg N ha–1 30 cm–1 in conventionally fertilized plots and by 200 kg N ha–1 30 cm–1 in a plot with no N fertilizer. After harvest, the pool of non-exchangeable NH4 + increased due to increasing mineral N concentrations in the soil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00384452
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Nitrogen transformation in arable soils of North-West Germany during the cereal growing season (1996)
    Springer
    Biology and fertility of soils 22 (1996), S. 179-183 
    Details
    ISSN: 1432-0789
    Keywords: Microbial N ; Immobilization ; Remobilization ; NH inf4 sup+ fixation ; Exchangeable NH inf4 sup+
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract In 1991, field experiments on loess (with winter wheat) and sandy soils (with summer barley) were conducted to study N dynamics in the microbial biomass and non-exchangeable NH inf4 sup+ . The measurements showed a mass change in microbial N, with a maximum increase of 100 kg N ha-1 30 cm-1 from March to July in the loess soil, and a change for only 1 month (May) in the sandy soil. Plots treated with conventional levels of N fertilizer (213 kg N ha-1 on a loess soil to winter wheat and 130 kg ha-1 on the sandy soil to summer barley), reduced levels of N (83% and 62% of the conventional N application), or no N showed no consistent fertilizer N effect on microbial biomass N. From March to July, non-exchangeable NH inf4 sup+ in loess soils under winter wheat decreased by 110 kg N ha-1 30 cm-1 in conventionally fertilized plots and by 200 kg N ha-1 30 cm-1 in a plot with no N fertilizer. After harvest, the pool of non-exchangeable NH inf4 sup+ increased due to increasing mineral N concentrations in the soil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00384452
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Significance of nitrate leaching and long term N immobilization after deepening the plough layers for the N regime of arable soils in N.W. Germany (1995)
    Springer
    Plant and soil 173 (1995), S. 167-175 
    Details
    ISSN: 1573-5036
    Keywords: C and N equilibra ; deep tillage ; long term N immobilization ; N balance ; N leaching ; organic matter dynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Field studies were conducted to assess the turnover and the leaching of nitrogen in arable soils of Lower Saxony (NW Germany). The mean surplus N (difference between N inputs by fertilization and N export by the yield; 146 field plots) from 1985–1988 amounted to 38 kg ha-1 yr-1 in fine textured (clay, loam, silt) and to 98 kg ha-1 yr-1 in coarse (sandy) soils. Leaching of nitrate calculated by a simple functional model for simulation of the N regime over the winter period (i.e. mineralization and leaching) was 16 kg ha-1 in the fine and 63 kg N ha-1 in coarse soils (mean values of the winter periods 1985–1988 from 256 plots). Before the 1960s, the depth of the Ap horizons rarely exceeded 25 cm in arable soils of the former FRG. During the last three decades, ploughing depth has increased to at least 35 cm. The mass balance calculations for total N after ploughing to 35 cm in loess soils of southern Lower Saxony (105 farm plots) yielded a mean increase in total N by about 900 kg ha-1 in 20 years. With respect to soil organic matter equilibria, N accumulation will continue for at least another 10 years on 67% of the examined farm plots. This study suggests that long term N immobilization is one of the most important sinks for nitrogen in arable soils of Germany. For simulation of the N dynamics over the growing season and for long time periods total nitrogen dynamics need to be considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00155528
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Modelling nitrogen dynamics in a plant-soil system with a simple model for advisory purposes (1991)
    Springer
    Nutrient cycling in agroecosystems 27 (1991), S. 273-281 
    Details
    ISSN: 1573-0867
    Keywords: N model ; nitrate transport ; mineralization ; wheat growth ; microbial immobilization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A simple functional computer model for advisory purposes is described. Results of simulation indicate some limitations of the model especially in handling the water regime in soils with fluctuating water tables. A major problem seems to be the ‘disappearance’ of fertilizer N. Measurements by the fumigation-extraction method of microbial N during the growing season show that disappearance of fertilizer N can partly be explained by immobilization by the microbial biomass.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01051133
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    Paper (German National Licenses)
    Fulltext
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