Quality of biomanure


Animal manure and slurry are well-known sources of plant nutrients for crop production, whereas the use of biogas residues from treatment of organic waste is less well documented.  It is known that biogas residues contain nitrogen, phosphorus, potassium and magnesium, as well as trace elements, all essential for the plant. However, rapid developments within the biogas area regarding both technologies and substrates have generated new organic residues - these must be evaluated before their widespread use as soil conditioners and fertilizers. The overall objective of this work is to evaluate the application of organic residues from biogas processes on arable crops, with regard to fertilizing effects, changes in microbial soil quality, and rates of nitrous oxides emission.


Specific issues to be investigated are:


  1. Effect on soil quality.
  2. Emisson rates of the green house gas, nitrogen oxide.
  3. Effect on crop yield.
  4. Risk of spreading plant pathogens.



Mikael Pell, Department of Microbiology, SLU, Box 7025, 750 07 Uppsala
Mikael.Pell@mikrob.slu.se, +46 (0) 18 673225