The effect of a 25% addition of composted pig slurry on the rooting of Pelargonium peltatum hort. in
a greenhouse medium consisting of perlite and highmoor peat (1:1 v/v) has been studied. The purpose of this
paper is to define relationships between the rooting process and occurrence of microflora in the media
without compost (control) and with the addition of that manure, as well as in the rhizosphere of the rooted
plants. The development of whole bacterial communities determined by their biomass size (direct method)
and the number of colony forming units (CFU) of actinomycetes and fungi (on selective media) were
estimated.