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Evaluation of Pre-emergence Herbicide and Hand Weeding on the Weed Control Efficiency and Performance of Transplanted Aus Rice

Mirza Hasanuzzaman
Manager
Department of Agronomy, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

M.H. Ali
Department of Agronomy, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

M.M. Alam
Department of Agronomy, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Mujahid Akther
Bayer Crop Science, Dhaka, Bangladesh

Kazi Fakhrul Alam
Department of Agricultural Extension, Hathazari, Chittagong

Abstract/ Executive Summary:

An experiment was conducted at the Agronomy field of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during March-August, 2009 to evaluate pre-emergence herbicides and hand weeding on the weed control efficiency and performance of transplanted aus rice. The experiment was carried out with seven (7) weed management treatments viz. W₁ = Control (no weeding); W₂= 1 hand weeding at 25 days after transplanting 12 (DAT); W₃ = 2 hand weeding at 25 and 50 DAT; W₄ = Topstar® 400 SP (Oxadiargyl 400 g/l) @ 190 ml ha^-1, W₅ = Sunrice 13.75 WG (Ethoxysulfuron 125 g/kg + Idiosulfuran 12.5 g/kg) @ 100 g ha^-1, W₆ = Top star 80 WP (Oxadiargyl 800 g/kg) @ 75 g ha^-1 and W₇ = Topstar® 400 SP (Oxadiargyl 400 g/l) @ 190 ml ha^-1 + 1 hand weeding at 25 DAT. The results showed that the treatment W₇ controlled the weeds most effectively which produced significantly highest yield and yield contributing characters. The treatment W₃ also produced identical yield to W₇ . The grain yield produced by W₇ (Topstar® 400 SP @ 190 ml ha^-1+ 1 hand weeding at 25 DAT) and W₃ (2 hand weeding at 25 and 50 DAT) was 104.90% and 92.65% higher than the yield obtained from unwedded control (W₁). Among the preemergence herbicides, Sunrice 13.75 WG showed better performance to control weed. Considering weed control cost W₇ found to be most economic weed control method for transplanted aus rice.

Keywords: Paddy, Herbicide, Weed control efficiency, Yield

Location: Agronomy field of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh

Start Date: 00-03-2009

End Date: 00-08-2009

Program Area: Crop-Soil-Water Management

Commodity: Herbicide

Objectives:

To evaluate the appropriate herbicide and find out the effective weed management practices in aus rice which will ensure an economic rice production.

Methodology:

The experiment was conducted at the Agronomy field of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during March-August, 2009. The soil of the experimental field belongs to the Shallow Red Brown Terrace Soils. The experiment was carried out with seven (7) weed management treatments viz. W₁= Control (no weeding); W₂= 1 hand weeding at 25 days after transplanting (DAT); W₃ = 2 hand weeding at 25 and 50 DAT; W₄= Topstar® 400 SP (Oxadiargyl 400 g/l) @ 190 ml ha^-1; W₅ = Sunrice 13.75 WG (Ethoxysulfuron 125 g/kg + Idiosulfuran 12.5 g/kg) @ 100 g ha^-1; W₆ = Topstar 80 WP (Oxadiargyl 800 g/kg) @ 75 g ha^-1and W₇ = Topstar® 400 SP (Oxadiargyl 400 g/l) @190 ml ha^-1 + 1 hand weeding at 50 DAT. The experiment was laid out with completely randomized block design (RCBD) with 3 replications. The rice variety ‘IRATOM’ was used in this study. A common procedure was followed for raising seedling in seed bed. Seedlings of 35 days old were uprooted from the nursery beds carefully. Seedlings were transplanted according to the treatments in the well-puddled experimental plots. Spacing’s were given 15 cm × 20 cm. A fertilizer dose of 80-50-50-10 kg ha^-1 of N, P₂O₅, K₂O and S were applied as urea, triple superphosphate, muriate of potash and gypsum were applied in the field. One-third urea and full dose of triple super phosphate, muriate of potash and gypsum were applied as basal dose at the time of final land preparation and incorporated well into the soil. Besides, cowdung at the rate of 10 t ha^-1 was applied before final ploughing. Rest two-third of urea was applied in two equal splits at 30 and 55 days after transplanting (DAT). All intercultural operations were done carefully. Hand weeding were done as per treatments. Topstar® was applied at 2 DAT and Sunrice was applied during final land preparation. Up to 10 DAT 5-7 cm water level was maintained in the field. Irrigation was done by alternate wetting and drying from transplanting to maximum tillering stage. From panicle initiation (PI) to hard dough stage, a thin layer of water (2-3 cm) was kept on the plots. Water was removed from the plots during ripening stage. Data regarding weeds were recorded at 35 and 60 days after transplanting (DAT). Dry weights of weeds were taken by drying them in electric oven at 60⁰C for 72 hours followed by weighing by digital balance. Ten samples hills were collected from each plot for collection of data on plant characters and yield components. The grain and straw weights for each plot were recorded after proper sun drying and then converted into t ha^-1. The grain yield was adjusted at 12% moisture level. The data were analyzed following Analysis of Variance (ANOVA) technique and mean differences were adjusted by the Multiple Comparison test using the statistical computer based programme CoStat v.6.400. Means were compared by using DMRT test.

Source of Information: American-Eurasian Journal of Agronomy 2 (3): 138-143, 2009 ISSN 1995-896X

Article Link (Online Journal): http://www.idosi.org/aeja/2%283%2909/4.pdf

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The results showed that the treatment W₇ controlled the weeds most effectively which produced significantly highest yield and yield contributing characters. The treatment W₃ also produced identical yield to W₇ . The grain yield produced by W₇ (Topstar® 400 SP @ 190 ml ha^-1 + 1 hand weeding at 25 DAT) and W₃ (2 hand weeding at 25 and 50 DAT) were 104.90% and 92.65% higher than the yield obtained from unwedded control (W₁). Among the pre-emergence herbicides, Sunrice 13.75 WG showed better performance to control weed. Considering weed control cost W₇ found to be most economic weed control method for transplanted aus rice.

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