The researchers tested different weed control methods on wheat crops to see which one worked best. They found that using a combination of clodinafop propargyl and metsulfuron methyl as herbicides resulted in the lowest weed population and highest wheat yield. This method also led to the most efficient removal of nutrients by weeds, meaning the wheat plants could absorb more nutrients for themselves. Overall, this herbicide combination was the most effective at controlling weeds and improving wheat growth compared to other treatments tested.