Fig. 2. Effect of herbicide suppression of existing pasture on emergence of forages sown using minimal-tillage.

 ^x CSG = cool-season grass; CSL = cool-season legume; WSG = warm-season grass; WSL = warm-season legume.

 ^y Drilled treatments except for (^a) =Broadcast treatments, where minimal-tillage broadcast = 100.

 ^z PE = percentage emergence; emerged seedlings expressed as a % of viable seed sown per unit area, PD = plant density; number of emerged seedlings per unit area, SR = stand rating; presence of sown species within a grid.

Image from Forage and Grazinglands article:
Comparison of Conventional and Minimal tillage for Low-Input Pasture Improvement