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Presence of Seeds in the Planetary Boundary Layer: Some Earlier Records: Discussion of: Shields, E. J., J. T. Dauer, M. J. Van Gessel, and G. Neumann. 2006. Horseweed (Conyza canadensis) seed collected in the planetary boundary layer.
Robert F. Parsons
Journal:

Weed Science / Volume 55 / Issue 2 / April 2007

Published online by Cambridge University Press:

20 January 2017, p. 185
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A recent paper (Shields et al. 2006) reports trapping seed of horseweed in the planetary boundary layer (PBL) of the lower atmosphere at heights up to 140 m above ground level. While it claims that seeds have not been trapped from the PBL before, it is shown here that seeds of other weedy composites were trapped at altitudes up to 610 m above ground level in southern Australia more than 40 yr ago.

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Presence of Seeds in the Planetary Boundary Layer: Some Earlier Records: Discussion of: Shields, E. J., J. T. Dauer, M. J. Van Gessel, and G. Neumann. 2006. Horseweed (Conyza canadensis) seed collected in the planetary boundary layer.