Abstract Background Straw, common in areas where no-till was adopted, can become a barrier for the applied herbicides to reach their destination, the soil. There is no information on the ability of the new herbicide pyroxasulfone to overcome this barrier and promote effective preemergence weed control. Objective To evaluate the effectiveness of pyroxasulfone in weed control when applied in different levels of straw, comparing it with herbicides available in the Brazilian market. Methods Two different experiments were carried out in […]