Table 4.
Comparison of the literature pollen release data to this study. Settling speed was calculated based on Stokes’ Law, 2014 and pollen density in von Hout et al. 2008
| Plants | Source dimension | Plant density | Pollen diameter | Pollen settling speed | Concentration at canopy at source center | Source strength |
|---|---|---|---|---|---|---|
| m | Plants/m2 | μm | m/sec | Grains/m3 | Grains/plant/sec | |
| Horseweed (This study) | 184 by 46 m | 9.5 | 16–22 | 0.017 | 0–2750 | 0–140 |
| Timothy Raynor et al. (1972) | 36.3 m diameter in 1962 | Planted densely, no density data | 30–35 | 0.037 | 0–11,000 | Not available |
| 36.3 m diameter in 1963 | Planted densely, no density data | 30–35 | 0.037 | 0–50,500 | Not available | |
| 18.3 m diameter in 1966 | Planted densely, no density data | 30–35 | 0.037 | 0–2542 | Not available | |
| Ragweed Raynor et al. (1972) | Point source | Not available | 18–22 | 0.018 | 0–5400 | Not available |
| Corn Wang and Yang (2010) | 16 m diameter | 7 | 90–100 | 0.3 | 0–1200 | 0–73 |
| Corn Raynor et al. (1972) | 18.3 diameter in 1963 | 7.5 | 90–100 | 0.3 | 0–100 | Not available |
| 18.3 diameter in 1964 | 3 | 90–100 | 0.3 | 0–54 | Not available |