Bangladesh Journal of Weed Science (BJWS)

EFFECTS OF HERBICIDES ON THE GROWTH AND YIELD OF WHEAT

2026-04-08T15:15:29+00:00

A field trial was conducted at the Regional Station, Bangladesh Wheat and Maize Research Institute (BWMRI), Rajshahi during winter season of 2023-24 to select the suitable herbicide for weed control on wheat. Nine treatments with BARI Gom 33 was used in this experimental as RCB design. Four major weeds were observed in the experimental field. The weed population and dry weight of weeds were low with Hammer 24 EC and high with control plot. The lowest dry weight of weed was found from Hammer at 35 DAS application. Among the treatments Hammer 24 EC showed higher weed control efficiency which was at par with Council WG and Hand weeding. Maximum grain yield was obtained from hand weeding which was as par with Council WG and Hammer 24 EC. The lowest grain yield was found from control treatment as anticipated. On the other hand, Council WG as per with Hammer 24 EC was economically suitable for the control of weeds comparatively with less cost. Therefore, according to weed control efficiency and economic benefits, Hammer 24 EC and Council 15 WG at 25 DAS application were found as the best herbicides for weeds control in the wheat field of Rajshahi region.

WEED CONTROL IN KENAF (Hibiscus cannabinus L.) THROUGH SEQUENTIAL APPLICATION OF PRE- AND POST- EMERGENCE HERBICIDES

2026-04-08T15:26:22+00:00

An experiment was conducted during April–September 2014 at Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh to evaluate the effect of some pre and post emergence herbicides on weed control, kenaf growth and yield. Fourteen treatment combinations formed by three pre-emergence herbicides (Panida, Prechlor and Manage), three post emergence herbicides (Quilop, Pyzero and Whip Super), hand weeding along with weedy check and weed free check were included in the study. The treatments were: T₁= Weedy check, T₂= Weed free check, T₃= Panida + hand weeding (HW), T₄= Prechlor + HW, T₅= Manage + HW, T₆= Panida + Pyzero, T₇= Prechlor + Pyzero, T₈= Manage + Pyzero, T₉= Panida + Quilop, T₁₀= Prechlor + Quilop, T₁₁= Manage + Quilop, T₁₂= Panida + Whip Super, T₁₃= Prechlor + Whip Super and T₁₄= Manage + Whip Super. The experiment was laid out in a randomized complete block (RCB) design with three replications. The result revealed that the treatment T₁₃(Prechlor + Whip Super) showed best control of weeds as reflected by lowest weed density and weed dry matter. This treatment (Prechlor @ 1.0 L ha⁻¹ in combination with Whip Super @ 650 mL ha⁻¹) gave the highest fibre and stick yields (3.55 and 7.59 t ha⁻¹, respectively) due to improvement of yield attributing characters. The study concluded that weeds in kenaf could be effectively controlled and the highest kenaf yield could be obtained by the applying a pre-emergence herbicide Prechlor @ 1.0 L ha⁻¹ at 3 days after sowing (DAS) followed by the post emergence application of Whip Super @ 650 mL ha⁻¹ at 25 days after sowing (DAS).

WEED DYNAMICS AND YIELD OF TRANSPLANTED AMAN RICE AS INFLUENCED BY VARIETY AND INTEGRATED WEED MANAGEMENT PRACTICES

2026-04-08T15:54:40+00:00

Competitive rice cultivars can influence weed suppression. Managing weeds sustainably to achieve desirable crop yields is a major concern worldwide. When the same weed management strategies are used, such as using same herbicide year after year in a certain area, weeds become resistant to that herbicide. To study the impact of variety and integrated weed management practices on weed growth and yield of rice, an experiment was conducted at the Agronomy Field Laboratory of Bangladesh Agricultural University, Mymensingh during the period from June to October 2023. The experiment included three T. aman rice varieties viz., BRRI dhan71, BRRI dhan75 and BRRI dhan87 and five weed management practices viz., unweeded control, two hand weedings at 15 and 30 days after transplanting (DAT), application of pre-emergence herbicide followed by one hand weeding (HW) at 30 DAT, application of early post-emergence herbicide followed by one HW at 30 DAT, application of pre-emergence herbicide followed by early post emergence herbicide. The experiment was laid out in randomized complete block design with three replications. Results showed that the experimental plots were infested with seven weed species belonging to five families. The most dominant weed species in the experimental fields were Panikachu (Monochoria vaginalis), Shama (Echinochloa crusgalli) and Sabuj Nakful (Cyperus difformis). The highest weed density and dry weight at 15 and 30 DAT were found in BRRI dhan75 with no weeding treatment and the lowest weed density and dry weight were observed in the variety BRRI dhan87 with application of pre-emergence herbicide followed by one HW at 30 DAT. In considering yield and yield attributes, BRRI dhan87 had highest number of effective tillers hill⁻¹, longest panicle, highest number of grains panicle⁻¹and highest grain and straw yields. Application of pre-emergence herbicide followed by one HW at 30 DAT exerted the highest number of effective tillers hill⁻¹, highest number of grains panicle⁻¹and highest grain and straw yields. The highest grain yield (5.22 t ha⁻¹) was recorded from the interaction of variety BRRI dhan87 with application of pre-emergence herbicide followed by one HW at 30 DAT due to highest number of grains panicle⁻¹in this treatment combination. Numerically the lowest grain and straw yields were found in the variety BRRI dhan71 with no weeding treatment combination. From the results of the study, it may be concluded that BRRI dhan87 with application of pre-emergence herbicide followed by one HW at 30 DAT may be recommended for controlling weed efficiently and maximizing grain yield of T. aman rice.

SEQUENTIAL APPLICATION OF PRE- AND POST- EMERGENCE HERBICIDES FOR CONTROLLING WEEDS IN OLITORIOUS JUTE

2026-04-08T16:01:26+00:00

An experiment was conducted at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh during April to September, 2014 to find out the weed control efficacy of different pre-emergence and post-emergence herbicides in tossa jute (Corchorus olitorious). Two pre-emergence herbicides viz. pendimethalin and pretilachlor; and three post-emergence herbicides viz. metamifop, quizalopfop-p-ethyl and fenoxapro-p-ethyl; were used in the experiment. Ten weed control treatments viz. no weeding control (T₁), weed free control (T₂), pendimethalin fb one hand weeding (T₃), pretilachlor fb one hand weeding (T₄), pendimethalin fb metamifop (T₅), pretilachlor fb metamifop (T₆), pendimethalin fb quizalopfop-p-ethyl (T₇), pretilachlor fb quizalopfop-p-ethyl (T₈), pendimethalin fb fenoxapro-p-ethyl (T₉) and pretilachlor fb fenoxapro-p-ethyl (T₁₀) were used in a randomized complete block design with three replications. Weed control treatments significantly affected weed density and dry weight and exerted significant effects on plant height, plant diameter, stick diameter, green weight plant⁻¹, green weight of bark plant⁻¹, green weight of stick of plant⁻¹, dry fibre weight plant⁻¹, dry stick weight plant⁻¹, fibre yield and stick yield. The result revealed that application of pretilachlor fb fenoxapro-p-ethyl produced the lowest weed density and dry matter and resulted in the highest fibre and stick yield. The present study concludes that the highest weed control in tossa jute could be possible by applying pretilachlor @ 1 L ha⁻¹at 2 days after sowing (DAS) followed by fenoxapro-p-ethyl @ 0.75 L ha⁻¹at 25 DAS.

EFFECT OF PLANTING GEOMETRY AND INTEGRATED WEED MANAGEMENT ON THE GROWTH OF WEED AND YIELD OF JIRASHAIL RICE

2026-04-08T16:11:07+00:00

Managing weeds sustainably to achieve desirable crop yields is a major concern worldwide. When the same weed management strategies are used, such as using similar herbicides excessively in a certain area to control weeds for a crop, weeds become resistant to that herbicide or technique, and gene flow from that resistant weed variant makes this condition worse. In this experiment, to solve this problem through proper weed control and get the highest yield of Jirashail rice, planting geometry (PG) and integrated weed management (IWM) methods were evaluated in the Agronomy Field Lab of BAU from August to November 2023. The experiment was laid out in an RCBD with three replications. The experiment was conducted with Jirashail rice with four PG (20 cm × 10 cm) (S₁), (20 cm × 15 cm) (S₂), (25 cm × 10 cm) (S₃), (25 cm × 15 cm) (S₄) and five different IWM practices such as W₀(unweeded control), W₁(Two hand weedings at 15 and 30 DATs), W₂[Application of pre-emergence herbicide (Pretilachlor) followed by one hand weeding at 30 DAT], W₃[Application of early post-emergence (EPE) herbicide (Acetachlor + Bensulfuron methyl) followed by one hand weeding at 30 DAT), W₄(Application of pre-emergence herbicide (PE) followed by early post-emergence herbicide). The highest weed density and dry weight were achieved when the S₃W₀ treatment was applied. Though S₁W₄treatment showed the lowest weed density and dry weight, rice grain yield was not that desirable here. However, the highest grain yield was observed at the S₄W₄ treatment with a minimum weed interference. The lower grain yield was observed at the spacing of 20 cm × 10 cm and unweeded control treatment (S₁W₀). From the study, it may be concluded that 25 cm × 15 cm planting geometry with the application of preemergence herbicide pretilachlor followed by early post-emergence herbicide could be recommended for Jirashail yield maximization as well as sustainable weed management.

WEED MANAGEMENT THROUGH ALLELOPATHIC INTERACTION OF BANGLADESHI MUSTARD VARIETIES

2026-04-08T17:35:47+00:00

The effect of weed management through allelopathic interaction of Bangladeshi mustard varieties was studied through experiments conducted in the agronomy field and laboratory of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh, in the Rabi season from October 2019 to February 2020. The experimental design in the laboratory bioassay was a completely randomized design (CRD) with three replications. The field experiment consisted of two factors which were factor A: mustard varieties (5) viz, Rai-5, BARI Sarisha-7, BARI Sarisha-8, BARI Sarisha-15, BARI Sarisha-18 (canola), and factor B: Weed management (3) viz, no weeding, one hand weeding at 15 DAS, and two hand weeding at 15 and 30 DAS. The field experiment was conducted utilizing a split-plot design with three replications, recording data on various parameters to evaluate its outcomes. The lab experiment revealed that among different mustard varieties, Rai-5, BARI Sarisha-7, BARI Sarisha-8, and BARI Sarisha-18 varieties performed well and showed potential allelopathic effects for reducing germination percentage and seedling growth of model plants (Lactuca sativa and Raphanus sativus) and weed (Echinochloa colona). Cynodon dactylon, Cyperus rotundus, and E. colona weed species were dominant in the mustard field. However, among different mustard varieties, BARI Sarisha-18 (canola) with 2 weeding recorded the maximum number of seeds siliqua⁻¹ (26), and seed yield (1.85 t ha⁻¹). This suggests that varieties with both high allelopathic interaction and great competitive ability would be most useful to help farmers maximize yield and control weeds.

WEED CONTROL EFFICACY OF PRE-EMERGENCE HERBICIDES IN PUDDLE TRANSPLANTED RICE

2026-04-08T17:43:05+00:00

Pre-emergence herbicides inhibit weed emergence and reduces the weed growth at early phase of the crop growth in transplanted lowland rice. Selection of pre-emergence herbicides of different mode of action and their rotational use reduces risk of herbicide resistance development in weeds. The experiment included thirteen herbicides for pre-emergence application, Pyrazosulfuran ethyl as early post emergence (EP) application along with a weed free and a weedy check as control. The experiment was laid out in a randomized complete block design with three replications. The results revealed that Pretilachlor, Pendimethalin, Butachlor, Penoxulam, and Carfentrazon ethyl provided best weed control (73-79%), while Pyrazosulfuran both as pre-emergence and early post emergence, Oxadiargyl, Metamiphop, Metribuzin, and Oxadiazone gave moderate (50-63%) weed control in transplanted rice. Among the herbicides, Triasulfuran gave only 30% weed control and exerted toxic effects on rice plant and reduced yield of crop. Different pre-emergence herbicides gave similar yield such as Butachlor (5.81 t ha⁻¹), Pretilachor (5.66 t ha⁻¹), Carfentrazol ethyl (5.58 t ha⁻¹), Orthosulfamuron (5.53 t ha⁻¹), and Ethoxysulfuron (5.46 t ha⁻¹) to that of weed free plots (5.98 t ha⁻¹). From the present study it appeared that pre-emergence herbicides of any of the four groups such as (i) Butachlor or (ii) Pretilachlor or (iii) Carfentrazon ethyl or (iv) Orthosulfamuron, Penoxulum, and Ethoxysulfuron could be used for successful weed control in puddle transplanted rice and the alternate use of these herbicides could be an effective tool for avoiding herbicide resistance development in weeds.

WEED SCIENCE RESEARCH IN MALAYSIA: ACHIEVEMENTS, CHALLENGES, RESEARCH GAPS AND FUTURE DIRECTIONS

2026-04-08T17:49:47+00:00

Weeds are a severe impediment to agricultural output in Malaysia, notably for rice and plantation crops like oil palm and rubber. This review examines Malaysian weed science's achievements, difficulties, research gaps, and future directions. Weed flora documentation, herbicide-based systems, integrated weed management (IWM), and technologies like Clearfield® rice and UAV spraying have all made significant advances. However, issues like as herbicide resistance, invasive weeds, labor shortages, and herbicide overuse remain. Seed bank ecology, biological control, molecular resistance mechanisms, climate change consequences, and artificial intelligence-based weed identification all have research gaps. Future priorities include ecological weed control, precision agriculture, resistance monitoring, and improved extension services. Sustainable weed management is crucial for long-term agricultural output.

PRODUCTIVITY AND PROFITABILITY OF SHORT DURATION MONSOON RICE UNDER VARYING RICE ESTABLISHMENT METHODS AND WEED MANAGEMENT PRACTICE

2026-04-08T18:08:21+00:00

A field experiment was conducted at Bangladesh Agricultural University, Mymensingh during the aman season of 2024 to assess the effects of rice establishment methods and weed management practices on weed pressure, crop performance, and the economic profitability of Binadhan-7, a short-duration monsoon rice (aman) variety. Three establishment methods viz. (i) zero-till non-puddled transplanted (ZT-NPT) (ii) reduced-till non-puddled transplanted (RT-NPT) and (iii) puddled transplanted (PT) rice, and six weed management practices viz. (i) Season-long weedy (W₀), (ii) Season-long weed free (W₁), (iii) Two hand weeding at 30 and 45 days after transplanting (DAT) (W₂), (iv) Pre-emergence herbicide (Pretilachlor) + One hand weeding at 45 DAT (W₃), (v) Pre + post-emergence herbicide (Penoxsulam) (W₄), (vi) Post-emergence herbicide + One hand weeding at 45 DAT (W₅) were tested in a split-plot design with three replications. Twelve weed species belonging to seven families infested the experimental plots, with the highest weed density and dry weight recorded under ZT-NPT, particularly in season-long weedy plots (W₀). ZT-NPT produced the highest grain (4.65 t ha⁻¹), straw (7.74 t ha⁻¹), and biological yields (12.39 t ha⁻¹). Among weed management practices, season-long weed-free conditions (W₁) resulted in the highest grain yield, while integrated weed control performed comparably. The interaction of zero-till non-puddled transplanting with post-emergence herbicide followed by one hand weeding at 45 DAT produced the maximum grain yield (4.99 t ha⁻¹) and the highest economic return (BCR 2.55). In conclusion, combining conservation tillage with integrated weed management proved to be the most productive and economically viable strategy for sustainable aman rice production.