Variable Herbicide Perfomance
Appendix A. List of parameters included in statistical analysisa.
| Observed factors | Observed covariates | Interpolated covariates |
| Crop planting date | Temperature at spraying | Max. temp. on spray date |
| Spray date | Wind speed | Min. temp. on spray date |
| Date of evaluation | Relative humidy at spraying | Rainfall on spray date |
| Spray additive used | Days from spraying to evaluation | Evaporation on spray date |
| Location in Australia | Herbicide dose | Temp. sum for 30 days prior to applic. |
| Wheat growth stage | Temp. sum from sowing to spraying | |
| Wheat density | Days prior to applic. since last rainfall | |
| Wild oat growth stage | Min. temp. sum for 7 days prior to app. | |
| Wild oat density | Min. temp sum for 7 days after app. | |
| Spray volume | Min. temp. sum for 7 days before and after app. | |
| Wheat yield | Soil moisture deficit at app. | |
| Soil moisture deficit 10 days prior to app. | ||
| Soil moisture deficit 10 days following app. |
aR. W. Medd et al. 2001. Determination of envirnoment-specific dose-response relationships for clodinafop-propargyl on Avena spp. Weed Res. 41:351-368.