Allelopathy plays an important role in weed control and crop productivity. In light of these, an experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh under the Old Brahmaputra Floodplain (AEZ-9) during the period from July 2021-June, 2022 to assess the combined effect of Fimbristylis dichotoma residues with manures and fertilizers on rice yield performance in boro season. The experiment consisted two rice varieties viz., BRRI dhan29 and BRRI dhan89; and six treatments of the combination of residues with manures and fertilizers viz., Control; Residues @ 3 t ha^-1 + Recommended doses of inorganic fertilizers; Residues @ 3 t ha^-1 + Tricho-compost @5 t ha^-1; Residues @ 3 t ha^-1 + Tricho-compost @1.5 t ha^-1 + 25% less than recommended doses of inorganic fertilizers; Residues @ 3 t ha^-1 + Tricho-compost @2.5 t ha^-1 + 50% less than recommended doses of inorganic fertilizers; Residues @ 3 t ha^-1 + Tricho-compost @3.75 t ha^-1 + 75% less than recommended doses of inorganic fertilizers. The experiment was laid out in a randomized complete block design (RCBD) with three replications. The highest grain yield was produced in T₄ (Residues 3 t ha^-1 +Trichocompost @1.5 t ha^-1 + 25% less than recommended fertilizers treatment). From the above results it was found that the variety BRRI dhan29 and T₄ (Residues 3 t ha^-1 +Trichocompost @1.5 t ha^-1 + 25% less than recommended fertilizers treatment) treatment exhibited the superior effect. The current study's findings indicate that the combination of manures and fertilizers increases yield and yield-contributing characteristics, and that Fimbristylis dichotoma residues have an herbicidal impact for inhibiting weed growth.