This project will evaluate the profitability and sustainability of cropping systems using lentils with the new metribuzin (MET) tolerance trait in combination with the imidazolinone (IMI) tolerance trait compared to those using the IMI trait alone. Lentil expansion areas of the SA southern Mallee and Eyre Peninsula will be the focus where problem weeds from historic farming systems and herbicide residues on coarse textured, low organic matter soils are constraints to production.