Abstract: Background: The adoption of no-till drilled rice by some producers, facilitated by increasing crop rotations and integration with cattle breeding, has led to varying ryegrass residue volumes. Herbicide efficiency may vary accordingly to their physicochemical characteristics, interaction with pasture residue, moisture and rainfall availability. Objective: To investigate the influence of ryegrass residue volume on barnyardgrass control in irrigated rice established in no-till drilling systems with pre-emergent herbicides. Methods: The experiment was conducted during the 2018/19 and 2019/20 crop seasons […]