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Effect of Time of Herbicide Application on Weed and Yield of Boro Rice Cv. BRRI Dhan29

Shamim Mia
Department of Agronomy, Patuakhali Science and Technology University, Patuakhali

M.S.U. Bhuiya
Department of Agronomy, Bangladesh Agricultural University, Mymensingh

Najrul Islam
Department of Agronomy, Bangladesh Agricultural University, Mymensingh

Abstract/ Executive Summary:

An experiment was carried out at the Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh from November 2005 to May 2006 to study the time of herbicide application on weed and yield of boro rice (BRRI dhan29). Two factors were included in the experiment- methods of crop establishment viz., direct seeded thick row, direct seeded thin row and transplanting method and four time of herbicide application viz. herbicide application after 3, 5, 7 and 9 days of sowing or transplanting with one control. The experiment was laid out in a split plot design assigning methods of crop establishment in the main plot and time of herbicide application in the sub-plot with three replications. Twelve weed species were found to infest the experimental crop. Among the weed species Echinochloa crusgalli was the most dominant weed, which was followed by Marsilea quadrifolia and the least dominant was Fimbristylis miliacea. Methods of crop establishment, time of herbicide application and their interaction significantly influenced the number and dry weight of weeds. The highest number and dry weight of weed were recorded in direct seeded thin row, followed by direct seeded thick row and the lowest in transplanting. Again, the highest number and dry weight of weed were recorded in control and the lowest in herbicide application after 3 days of seeding or transplanting. Weed control efficiency was higher in those receiving early application of herbicide. The highest weed control efficiency was in herbicide application at 3 days after seeding or transplanting. Phytotoxicity of herbicide increased with the earliness of herbicide application and highest phytotoxicity was observed in direct seeded thick row having herbicide application 3 days after sowing.

Keywords: Herbicide, Direct seeded rice

Location: Agronomy Field Laboratory, Bangladesh Agricultural University, Mymensingh

Start Date: 00-11-2005

End Date: 00-05-2006

Program Area: Pest Management

Commodity: Rice

Objectives:

1. To study the time of herbicide application on weed and yield of boro rice (BRRI dhan29).

Methodology:

The field lies in Old Brahmaputra Floodplain (Agro-ecological zone No. 9). The area of unit plot was 10 m² (4 m × 2.5 m). The experiment was laid out in a split plot design assigning methods of crop establishment in the main plot and time of herbicide application in the sub-plot with three replications. The treatment included (i) three methods of crop establishment viz., direct seeded thick row(M1), direct seeded thin row(M2) and transplanting method(M3) and (ii) four time of herbicide(Rifit 500EC) application viz. herbicide application after 3, 5, 7 and 9 days of sowing with one control. For direct seeding (thick and thin row) sprouted seeds are sown, in well puddled plots using drum seeder. In case of transplanting 30 day old seedlings having similar age that of drum seeding, were transplanted with a spacing of 20 cm × 15 cm. Fertilizers were applied as recommended. The crop was harvested at maturity. Data on weed parameters were collected at 25 and 50 DAT and 55 and 80 DAS by taking randomly 0.25 m2 (0.5 m × 0.5 m) of land from each unit plot. Mortality of seedlings due to phytotoxicity of herbiciode was recorded on 3 and 15 DAS or DAT. Percent weed control The percent weed control by each of the treatments was calculated by the following formula: Percent weed control = (No. of weeds killed per unit area in treated plts/No. of weeds present per unit area in control plot)x 100. Weed control efficiency (on the basis of dry weight) was calculated using the following formula, WCE = [(DWC-DWT)/DWC]x100. Where, WCE = Weed control efficiency, DWC = Dry weight of weeds in weedy check, DWT = Dry weight of weeds in mechanical or chemical treatment. Collected data on weed parameters and different crop characters were statistically analyzed and the mean differences were judged by DMRT (Duncan’s Multiple Range Test).

Source of Information: J. Agrofor. Environ. 2(2): 187-192, 2008; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Direct seeded rice under early application of herbicide reduced population and dry weight of weed effectively but showed significantly higher phytotoxicity to rice plant. Direct seeded thick row sown rice under herbicide application at 7 days after sowing would be promising both for effective weed control as well as lower phytotoxicity.

Knowledge Management: Journal