Biochar application and alternate wetting and drying (AWD) irrigation are promising practices for achieving cleaner rice production. This study evaluated the combined effects of biochar and AWD irrigation on the grain yield and water productivity (WP) of wet direct‐seeded rice (WDSR). A pot experiment combining five biochar doses (0, 5, 10, 15 and 20 t ha −1 ) with three soil water potential levels (0, −15 and −30 kPa) via AWD...