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Performance of Herbicides for Weed Suppression in Wet Seeded Boro Rice.

Md. Khairul Alam Bhuiyan
SO
Agronomy Diovision, BRRI.

Abstract/ Executive Summary:

Weeds may reduce the yield of rice to a large extent. Objective of this study was to observe the effectiveness of herbicide to control weeds in wet season rice under broadcast and drum seeded method. The experiment was conducted in Boro 2005 to observe the effectiveness of herbicide to control weeds in wet season rice under broadcast and drum seeded method. Results indicated that predominant weed species were Scirpus maritimus, Echinochloacrusgalli, Cynodon dactylon, Desmodium trifolium, Cyperus defformis and Monochoria vaginalis were observed on weed in the experiment field. Effect of planting method in different weed control treatment on weed dynamics indicated that, un-weeded plot produced the highest weed number and weights in both drum seeder and broadcasting method. There are no significant effects of the treatments irrespective of planting method. For plant population no significant effect was observed due to planting method irrespective of different weed control treatments. It is observed that weeding treatment significant significantly influenced yield and yield contribution characters of wet seeded rice. Highest Grain panicle-1 was observed in weed free treatment followed by other treated plots. The lowest Grain panicle-1 was observed in un weeded plot. Similarly highest yield was observed in weed free plot (5.03 tha-1) followed Machete+ 1HW treated plot and Rifit alone plot. The lowest yield was observed in un weeded plot, only 2.16 tha^-1. There is no significant effect of the weeding treatment irrespective of Broadcasting and drum seeding which produced similar grain yield.

Keywords: Herbicides, Weed suppression, Wet seeded, Boro rice, Broadcast and drum seeded method

Location: BRRI farm, Gazipur

Start Date: 01-07-2004

End Date: 30-06-2005

Program Area: Crop-Soil-Water Management

Commodity: Herbicide

Objectives:

To observe the effectiveness of herbicide to control weeds in wet season rice under broadcast and drum seeded method.

Methodology:

The experiment was conducted in Boro 2005 to observe the effectiveness of herbicide to control weeds in wet season rice under broadcast and drum seeded method. The experiments were laid out in split plot design with three replications. Weed control method were placed in main plot and planting methods were in sub plots. The treatments were A) weed control method: i) Sunrise + 1HW ii) Rifit + 1HW iii) Machete + 1HW iv) Sunrise alone v) Rifit alone vi) Machete alone vii) Weed free by hand weeding and viii) Control B) Planting methods was i) Broadcasting ii) Drum Seeding. Drum seeder single row systems were used for sowing the seeds @ 50 kg ha^-1, Rifit and Machete were applied at 4 days after sowing @ 1 L ah^-1 and 25 kg ha^-1 respectively. Sunrise is post emergence herbicide. It was applied @ 100 g ha^-1 at 10 DAS. Other operations were same as and when necessary. Weed samplings were done before one hand weeding of the respective herbicide treatment.

Source of Information: BRRI. Proceedings of the BRRI Annual Internal Review for 2004-2005. Bangladesh Rice Research Institute (BRRI). Gazipur -1701.

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Results indicated that predominant weed species were Scirpus maritimus, Echinochloacrusgalli, Cynodon dactylon, Desmodium trifolium, Cyperus defformis and Monochoria vaginalis were observed on weed in the experiment field. Effect of planting method in different weed control treatment on weed dynamics indicated that, un-weeded plot produced the highest weed number and weights in both drum seeder and broadcasting method. There are no significant effects of the treatments irrespective of planting method.

Knowledge Management: Report/Proceedings