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  • Contaminated soils  (1)
  • Forage crops  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Nitrous oxide release from arable soil: importance of perennial forage crops (1998)
    Springer
    Biology and fertility of soils 28 (1998), S. 36-43 
    Details
    ISSN: 1432-0789
    Keywords: Key words Nitrous oxide ; Forage crops ; Spring barley ; Nitrogen fertiliser ; Thawing and freezing cycles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  N2O emission rates from a sandy loam soil were measured in a field experiment with 2 years of perennial forage crops (ryegrass, ryegrass-red clover, red clover) and 1 year of spring barley cultivation. Spring barley was sown after the incorporation of the forage crop residues. All spring barley plots received 40 kg N ha–1 N fertiliser. Ryegrass, ryegrass-red clover and red clover plots were fertilised with 350 kg N ha–1, 175 kg N ha–1 and 0 kg N ha–1, respectively. From June 1994 to February 1997, N2O fluxes were continuously estimated using very large, closed soil cover boxes (5.76 m2). In order to compare the growing crops, the 33 months of investigation were separated into three vegetation periods (March–September) and three winter periods (October–February). All agronomic treatments (fertilisation, harvest and tillage) were carried out during the vegetation period. Large temporal changes were found in the N2O emission rates. The data were approximately log-normally distributed. Forty-seven percent of the annual N2O losses were observed to occur during winter, and mainly resulted from N2O production during daily thawing and freezing cycles. No relationship was found between the N2O emissions during the winter and the vegetation period. During the vegetation period, N2O losses and yields were significantly different between the three forage crops. The unfertilised clover plot produced the highest yields and the lowest N2O losses on this soil compared to the highly fertilised ryegrass plot. Total N2O losses from soil under spring barley were higher than those from soil under the forage crops; this was mainly a consequence of N2O emissions after the incorporation of the forage crop residues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003740050460
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  • 2
    Electronic Resource
    Electronic Resource
    The effect of sulfur-containing nitrogen fertilizers on the elemental composition of celery (Apium graveolens) grown on a polluted marsh soil (1986)
    Springer
    Plant and soil 91 (1986), S. 273-278 
    Details
    ISSN: 1573-5036
    Keywords: As ; Au ; Ba ; B ; Br ; Ca ; Cd ; Celery ; Contaminated soils ; Co ; Cr ; Ce ; Fe ; Hg ; La ; Mn ; Mo ; N-fertilizers ; Rb ; S ; S-sources ; Sb ; Sc ; Se ; Th ; Zn
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In order to investigate elemental composition of celery, and to quantify the influence of sulfur-containing N-fertilizers on the trace element uptake, a field trial with celery was carried out on marsh soil polluted with municipal wastes. The research yielded the following results: Compared to leaves at harvest time, bulbs showed significantly lower concentrations of Mo, S and Sb, but higher contents of B, Br and Cr and Cu. Since the acidifying effect of the fertilizers was suppressed by the free calcium carbonate in the soil, no significant changes in concentrations of cationic trace elements were detected in plants fertilized with ammonium sulfate compared to those which received urea or calcium ammonium nitrate. On the other hand, in these plants the conspicuous increase in total sulfur was accompanied by a significant decrease in concentrations of up to 30% for B, Br and Sb, 50% for As, 60% for Se and 80% for Mo. According to these results, in plant production on contaminated soils certain plant parts may be marketable due to their low tendency to accumulate toxic elements, and furthermore it may be feasible to reduce the contents of some of these elements in plants by the use of sulfur-containing fertilizers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02181795
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