Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Bio-efficacy of Acetochlor 50% Ec Against Weed Suppression in Transplanted Rice Ecosystem

M. A. A. Mamun
Agronomy Division, Bangladesh Rice Research Institute, Gazipur

A. J. Mridha

A. Akter
Faculty of Disaster Management, Patuakhali Science and Technology University

A. Parvez

Abstract/ Executive Summary:

Field experiments were conducted at Bangladesh Rice Research Institute (BRRI), Gazipur in Aus, 2010 and BRRI Rangpur, during Boro 2011 to evaluate the performance of Acetochlor 50% EC for weed suppression, to find out an appropriate dose of the herbicide and its impacts on transplanted rice. Acetochlor 50%EC @ 200, 250 and 300 ml ha^-1 were applied. Pretilachlor 50% EC @ 1L ha^-1, weed free and unweeded control was used for comparison. The most dominant weeds were Cyperus diffornis, Monochoria vaginalis and Echinochloa crus-galli in year 1 and Cyperus diffornis and Echinochloa crus-galli in year 2. Cyperus diffornis was at the higher rank of dominant in both years. Application of Acetochlor 50%EC @ 250 ml gave more than 80% weed control efficiency, lower number and dry weight of weeds which ultimately resulted in higher yield attributes and grain yield of transplanted rice that were comparable to the standard in both seasons.

Keywords: Rice, Weeds, Acetochlor, 50%EC, Pretilachlor 50%EC

Location: Bangladesh Rice Research Institute farm, Gazipur

Start Date: 00-03-2010

End Date: 00-05-2011

Program Area: Pest Management

Commodity: Weedicide

Objectives:

1. To evaluate the performance of Acetochlor 50% EC for broad spectrum control of weeds, to find out an appropriate dose of the herbicide and its impacts on transplanted rice.

Methodology:

Acetochlor 50%EC is a new molecule. The commercial name of Acetochlor 50%EC is Smart 50% EC. It is a new pre emergence herbicide that evaluated at Bangladesh Rice Research Institute farm, Gazipur in Aus, 2010 and BRRI Rangpur, during Boro 2011. Acetochlor 50%EC @ 200, 250 and 300 ml ha^-1 were applied. Pretilachlor 50% EC @ 1L ha^-1, weed free and unweeded control was used for comparison. The treatments were i) T₁=Acetochlor 50%EC @ 200 ml ha^-1, ii) T₂=Acetochlor 50%EC @ 250 ml ha^-1, iii) T₃=Acetochlor 50%EC @ 300 ml ha^-1, iv) T₄=Pretilachlor 50% EC @ 1L ha^-1, v) T₅= Weed free by hand weeding and vi) T₆=Control (Unwedded). Pretilachlor 50% EC was used to compare the new herbicide. The experiment was laid out in a RCB design with 3 replications. Forty days old seedlings of BRRI dhan28 for Boro and 30 days of BR26 for Aus were transplanted at 20 x 20 cm spacing with 2 seedlings hill^-1 at BRRI farm Gazipur and Rangpur. Fertilizer was applied following BRRI recommended dose. Herbicides were sprayed at 5 days after transplanting. In weed free treatment, the plots were kept weed free up to 50 DAT by two hand weeding. Weed control efficiency (WCE%) was calculated. Acetochlor 50%EC herbicide is innovative in Bangladesh and its phytotoxicity needs to be evaluated on rice crop. The phytotoxicity of the herbicide to rice plants was determined by visual observations (Yellowing leaves, burring leaf tips, stunting growth etc). The degree of toxicity on rice plant was measured by the following scale used by IRRI.

1. No toxicity, 2. Slightly toxicity, 3. Moderate toxicity, 4. Severe toxicity, 5. Toxic (plant kill)

The rating of toxicity was done within 7 days after application of herbicides. It was observed three times at 3, 5 and 7 days after application of herbicide and the mean rate was calculated from 10 sample plants of a unit plot. Yields and yield contributing characters of rice were recorded after harvest. The data were analyzed following analysis of variance (ANOVA) technique and mean differences were depicted by multiple comparison test using the statistical program MSTAT-C. The contribution of an individual weed species to the weed community was determined by its twofactor summed dominance ratio (SDR). This was calculated using relative weed density (RD) and relative dry weight (RDW).

Source of Information: J. Environ. Sci. & Natural Resources, 4(2): 73 - 77, 2011; ISSN 1999-7361

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

From the study it is concluded that Acetochlor 50%EC @ 250 ml ha^-1 controlled weeds effectively and produced optimum grain yield in both seasons and locations. No plant injury was observed during the crop growing period due to the application of Acetochlor 50% EC.

Knowledge Management: Journal