This study aimed to identify the potential allelopathic indigenous rice (Oryza sativa L. ssp. indica) varieties from Bangladesh using a performance study in a weed‐infested field and to assess the extent of allelopathic interference relative to resource competition in a glasshouse experiment. Six varieties – namely, “Boterswar,” “Goria,” “Biron” and “Kartiksail” as the most allelopathic, “Hashikolmi” as weakly allelopathic and “Holoi” as nonallelopathic – were raised following a nonweed control method. The infestation levels of weed species were calculated using Simpson's Diversity Index (SDI), which ranged from 0.2 to 0.56. However, a significant correlation coefficient (0.87, P < 0.001) was obtained from these field data compared with the root inhibition percentage from the laboratory bioassay, and the “Boterswar” variety was the most allelopathic. The interactions between the allelopathic variety “Boterswar,” weakly allelopathic variety “Hashikolmi” and Echinochloa oryzicola via a target (rice)‐adjacent (E. oryzicola) cogrowth culture were determined in a hydroponic arrangement. The relative competitive intensity (RCI) and the relative neighbor effect (RNE) values showed that the crop–weed interaction was facilitation for “Boterswar” and competition for “Hashikolmi” and E. oryzicola in rice/E. oryzicola cogrowth cultures. The allelopathic effects of “Boterswar” were much higher than the resource competition in rice/E. oryzicola cogrowth cultures. The converse was observed for “Hashikolmi.” Moreover, the mineral content of E. oryzicola was severely affected by “Boterswar”/E. oryzicola cogrowth cultures’ exudate solution. Therefore, the allelopathic potential of “Boterswar” variety might be useful for developing the weed‐suppressing capacity of rice, which will likely have a significant influence on paddy weed control.

中文翻译：

---

孟加拉土著稻在杂草侵染田中的表现以及化感病与资源竞争的分离

本研究旨在找出潜在的化感土著稻（稻属亚种籼稻使用杂草出没的野外性能的研究来自孟加拉国）品种，以评估在温室试验相对于资源竞争的化感干涉的程度。通过非杂草控制方法，共培育了六个品种，即“ Boterswar”，“ Goria”，“ Biron”和“ Kartiksail”为化感最强，“ Hashikolmi”为弱化感和“ Holoi”为非化感。使用Simpson多样性指数（SDI）计算杂草物种的侵染水平，其范围为0.2至0.56。但是，相关系数显着（0.87，P 从这些田间数据中获得的<0.001）与实验室生物测定中的根抑制百分比相比，“ Boterswar”品种是化感作用最强的品种。化感品种“Boterswar，”弱化感品种“Hashikolmi”和之间的相互作用稗经由目标（稻）-adjacent（E.空心稗在水耕布置测定）cogrowth培养。相对竞争强度（RCI）和相对邻居效应（RNE）值表明，稻草/ E。oryzicola中作物与杂草的相互作用促进了“ Boterswar”的竞争，并促进了“ Hashikolmi”和E. oryzicola的竞争。共生文化。“Boterswar”的化感作用比水稻/资源竞争更高E.空心稗cogrowth文化。对于“ Hashikolmi”则相反。此外，矿物质含量E.空心稗由“Boterswar” /受到严重影响E.空心稗cogrowth培养渗出液。因此，“ Boterswar”变种的化感潜力可能有助于开发水稻的除草能力，这可能对稻田杂草的控制产生重大影响。