conducted an extensive series of bioaerosol
tests during land application of cattle and swine slurry with mobile
and stationary farm equipment. They reported that total bacterial
counts in air at the edge of the applied areas was >2000/m3
, and
no pathogenic bacteria were recovered. High pressure spray gun
systems that discharge the liquids upwards results in substantial
droplet size reduction and drift, whereas tank spreading reduced
the spray area arc and drift, resulting in reduced airborne bacteria
concentrations relative to the spray gun.