Biology and Fertility of Soils

, Volume 27, Issue 1, pp 85–91

Effects of storage time and straw content of cattle slurry on the mineralization of nitrogen and carbon in soil

  • P. Sørensen

DOI: 10.1007/s003740050404

Cite this article as:
Sørensen, P. Biol Fertil Soils (1998) 27: 85. doi:10.1007/s003740050404


 Animal slurries are stored for a variable period of time before application in the field. The effect of cattle slurry storage time and temperature on the subsequent mineralization of C and N in soil was studied under laboratory conditions. Urine and faeces from a dairy cow were sampled separately and mixed to a slurry. After 4 weeks of storage under anaerobic conditions at 15  °C, the NH4+ N content exceeded the original urinary N content of the slurry; the NH4+ content increased only slightly during the following 16 weeks of storage. After 4 weeks of storage, the proportion of slurry C in volatile fatty acids (VFA) amounted to 10% and increased to 15% after 20 weeks. Straw addition to the slurry caused an increase of VFA-C in stored slurry, but had a negligible influence on the proportion of slurry N in the form of NH4+. Slurries subjected to different storage conditions were added to a sandy and a sandy loam soil. After 1 week, the preceding storage period (0–20 weeks) and temperature (5  °C or 15  °C) had no significant effect on the net release of inorganic N from the slurry in soil. Thus, the increased NH4+ content in the slurry after storage was followed by increased net N immobilization in soil. Additional straw in the slurry caused increased net N immobilization only in the sandy loam soil. Following anaerobic storage, 8–14% of slurry C was released in gaseous form, and the net mineralization of slurry C after 12 weeks in soil amounted to 54–63%. The extra net mineralization of C in soil due to straw in slurry was equivalent to 76% of straw C, suggesting that the straw accelerated the mineralization of C derived from faeces, urine and/or soil.

Key words Ammonium Animal manure Carbon balance Immobilization Volatile fatty acids 

Copyright information

© Springer-Verlag Berlin Heidelberg 1998

Authors and Affiliations

  • P. Sørensen
    • 1
  1. 1.Plant Biology and Biochemistry Department, Risø National Laboratory, DK-4000 Roskilde, DenmarkDK

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