Spore Deposition Velocities Measured Over a Barley Crop

Abstract

AbstractDeposition velocities, vg, to horizontal slides were measured over a barley crop for a range of air spora. Slides were either freely exposed, placed on a 60 cm2 table or placed in a large beaker. Deposition velocities calculated from the spore catch on freely exposed slides were 2–3 times the sedimentation velocity for all spore classes. While exposure of slides in protected enclosure reduced turbulent deposition, the values of vg were still almost twice the sedimentation velocity. Thus caution must be advised when interpreting such deposition measurements in terms of spore concentration.