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1 March 2007 Presence of Seeds in the Planetary Boundary Layer: Some Earlier Records
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Abstract

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.

Nomenclature: Horseweed, Conyza canadensis (L.) Cronq.

Robert F. Parsons "Presence of Seeds in the Planetary Boundary Layer: Some Earlier Records," Weed Science 55(2), 185, (1 March 2007). https://doi.org/10.1614/WS-07-001A.1
Received: 10 January 2007; Accepted: 1 January 2007; Published: 1 March 2007
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