The researchers tested different combinations of herbicides on sugar cane crops in Sudan to see which one controlled weeds the best and improved sugar cane growth and yield. They found that the combination of Metribuzin and Pendimethalin was the most effective in controlling both grass and broadleaved weeds, leading to higher sugar cane yield and quality compared to other treatments. This herbicide mixture not only helps farmers make more money but also reduces the number of weed seeds in the soil.