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Performance of Silah 500 Ec (pretilachlor) for Weed Supperession in Rice.

Md. Khairul Alam Bhuiyan
SSO
Agronomy Division, BRRI, Gazipur

Abstract/ Executive Summary:

The study was conducted with the objective to observe its (Silah 500 EC) weed control efficiency, impact on plant growth and yield of BR26. Bio efficacy data of Silah 500EC @ 1.0 Lit ha^-1 against weed suppression indicated that 80% control of Cyperus iria, 82% control of Ludwigia octovalvis, 77% control of Echinochloa crusgalli, and 81% control of Monochoria vaginalis and 86% control of Alternenthera phyloxeroides were achieved. No significant effect on plant height due to different doses of herbicide but little bit higher plant height observed in weed free plot. Herbicide treatment significantly influenced on tiller production, panicle production, grain per panicle and grain. The highest tiller m²(250.00) was observed from in weed free plots which was statistically similar with other treated plot treated plot except un weeded plot. The lowest tiller m² (148.00) was observed from un weeded plots. In case of Panicle per m² similar trend of result was observed. Number of filled grain panicle^-1 was statistically higher in weed free (71) treatment and the lowest grain panicle^-1 (45) was observed in un weeded plots. Considering grain yield, weed free plot gave the highest yield (3.610 t/ha) which statistically similar with other herbicide doses treated plot. The lowest grain panicle^-1 was observed from in un weeded plot (1.86 t/ha^-1).

Keywords: Silah, 500 EC (Pretilachlor), Weed, Supperession, Rice, Herbicide.

Location: Farmers field, Burichang Comilla.

Start Date: 01-07-2004

End Date: 30-06-2005

Program Area: Crop-Soil-Water Management

Commodity: Herbicide

Objectives:

To observe its (Silah 500 EC) weed control efficiency, impact on plant growth and yield of BR26.

Methodology:

The study was conducted at Farmers field, Burichang Comilla. The treatment were i) Silah 500 EC @ 0.5 L ha^-1 ii) Silah 500 EC @ 1.0 L ha^-1 iii) Silah 500 EC @ 1.5 L ha^-1 iv) Corostar 25 EC @ 2.0 L ha^-1 v) weed free and vi) control. Corostar @ 2.0 L ha^-1 was used to compare the new herbicide. The experiment was laid out in RCB design with 3 replications. Thirty days old seedlings of BR26 were transplanted on 5th May, 2005 at 20 x 20 cm spacing with 2 seedling hill^-1. Fertilizer was applied following BRRI recommended dose. Herbicides were sprayed at 3 days after transplanting. In weed free treatment, the plots were kept weed free up to 40 DAT. Weed control efficiency was calculated using weed dry matter weight data. Other operations were done as when necessary.

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:

From the study it was found that Silah 500 EC @ 1.0 L ha^-1 controlled weed effectively and produced optimum grain yield in T. Aus season at farmers field of Comilla.

Knowledge Management: Report/Proceedings