Evaluating T. Aman Rice Yield under the Combined Effects of Fertilizers, Manures and Allelopathy from Eleocharis atropurpurea and Cyperus difformis

To evaluate the combined effect of fertilizers and manures on transplant aman rice, an experiment was carried out at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh, from July to December 2019. The trial included two cultivars (Binadhan-13 and BRRI dhan34) and seven treatments such as Control, Residues 3 t ha-1 + Cowdung 5 t ha-1, Residues 3 t ha-1 + Cowdung 2.5 t ha-1 + Fertilizers (N = 55 kg ha-1, P = 30 kg ha-1, K = 25 kg ha-1, S = 15 kg ha-1), Residues 3 t ha-1 + Vermicompost 5 t ha-1, Residues 3 t ha-1 + Vermicompost 2.5 t ha-1 + Fertilizers (N = 55 kg ha-1, P = 30 kg ha-1, K = 25 kg ha-1, S = 15 kg ha-1), Residues 3 t ha-1 + Trichocompost 10 t ha-1, Residues 3 t ha-1 + Trichocompost 5 t ha-1 + Fertilizers (N = 55 kg ha-1, P = 30 kg ha-1, K = 25 kg ha-1, S = 15 kg ha-1). The experiment was set up using a randomized complete block design (RCBD) with three replications. Plant height, number of effective tillers hill-1, panicle length, grain yield, straw yield, biological yield, and harvest index were among the yield-contributing characteristics that were not significantly impacted by variety. BRRI dhan34 produced highest yield due to both the higher number of grains panicle-1 and number of filled grain. The lowest grain yield and harvest index was found in T1 (control). The study's findings suggest that fertilizer, manures, and residues interact in order to raise transplant aman rice output. Hence, the combination of manures and fertilizers with residues of Cyperus difformis and Eleocharis atropurpurea might serve as a source of yield-boosting tools for agricultural sustainability.