The experiment was carried out at the Agronomy Field Laboratory (24°75' N latitude and 90°50' E longitude), Bangladesh Agricultural University, Mymensingh, Bangladesh. The soil is characterized by non-calcareous dark gray floodplain soils having pH value of 6.5. During the growing season (July–December, 2015), monthly average maximum temperature, minimum temperature, relative humidity, air pressure, wind speed, solar radiation, dew point, pan evaporation and water temperature were 29 °C, 20 °C, 85%, 1006 mb, 6 km h-1, 271 W m-2, 21°C, 3 mm and 23°C, respectively, while monthly total rainfall and sunshine hours were 0–387.9 mm and 84.4–205.9 h, respectively. The average soil temperature at a depth of 5, 10, 20 and 30 cm were 29, 27, 27 and 25°C, respectively. The experiment was laid out in randomized complete block design with three replications. The experiment was conducted with five aromatic rice varieties viz., Kalijira, BRRI dhan34, BRRI dhan37, BRRI dhan38 and Binadhan-13, and six weed management practices namely; no weeding, weed free, mechanical (by using weeder) + manual (hand pooling) weeding, pre-emergence herbicide + manual weeding, post-emergence herbicide + manual weeding, pre-emergence herbicide + post- emergence herbicide during the crop growth period. Here, bensulfuran methyl + acetachlor @ 750 g ha-1 was used as pre-emergence herbicide and pyrazosulfuran ethyl @ 125-150 g ha-1 was used as post-emergence herbicide. After subsequent ploughing followed by laddering, the land was fertilized with 150, 97, 70, 60 and 12 kg ha-1 urea, triple super phosphate, muriate of potash, gypsum and zinc sulphate, respectively. All the fertilizers except urea was applied in the unit plots at the time of final land preparation; while urea was top-dressed in three equal splits at 30, 50 and 70 days after transplanting (DAT). Thirty five days old seedlings of aromatic rice varieties were transplanted at the rate of two to three seedlings hill-1 maintaining row and hill spacing of 25 cm and 15 cm, respectively. Other intercultural operations were done proper- ly as per standard practices. Pre-emergence herbicide (bensulfuran methyl + acetachlor @ 750 g ha-1) was applied to the target plots at 5 days after transplantation (DAT) and post- emergence herbicide (pyrazosulfuran ethyl @ 125-150 g ha-1) was applied to the target plots at 30 DAT. The data of weed parameters were collected at 45 DAT, 65 DAT and 85 DAT of rice plants. The relative density and dry weight, summed dominance ratio of weeds were obtained using the following formula by Janiya and Moody (1989). The collected data were compiled and tabulated in proper form and were subjected to statistical analysis. Data were analyzed using the analysis of variance (ANOVA) technique with the help of computer package program MSTAT and mean differences were adjudged by Duncan’s Multiple Range Test (Gomez and Gomez, 1984).