Fig. 3. Effect of herbicide suppression of existing pasture on relative mean total yield of forage following seeding by 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.

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