| Site | Location | Year | Soil Characteristics | OM | pH | CEC | Spray Date | Giant Ragweed | ||||
| Sand | Slit | Clay | Classification | Height | Density | |||||||
| ---------------%--------------- | % | CaCl2 | Cmolckg−1 | cm | No. m−2 | |||||||
| S1 | Harrow | 2013 | 27.2 | 33.6 | 39.2 | clay loam | 3.7 | 7.3 | 17.9 | 17-May | 8 | 267 |
| S2 | Harrow | 2013 | 55.2 | 26.6 | 18.2 | sandy loam | 4 | 7.7 | 16.9 | 09-May | 9 | 214 |
| S3 | Tilbury | 2013 | 21.1 | 36.6 | 42.2 | clay | 3.1 | 7.9 | 21.9 | 09-May | 8 | 181 |
| S4 | Harrow | 2014 | 51 | 28.4 | 20.6 | loam | 3.2 | 7.4 | 15.5 | 16-May | 10 | 48 |
| S5 | Harrow | 2014 | 22 | 38.9 | 39.1 | clay loam | 4.1 | 7.4 | 20.5 | 20-May | 8 | 330 |