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Effect of Rice Bran Application for Eco- FRIendly Weed Control, Growth and Yield of Lowland Rice in Bangladesh

Md. Khairul Alam Bhuiyan
SSO
Agronomy Division, BRRI, Gazipur-1701

AJ Mridha
CSO,PSO,SSO and SO
Agronomy Division, BRRI, Gazipur

Abstract/ Executive Summary:

Experiments were conducted during dry season of 2006 and 2007 at BRRI farm Gazipur and Bhanga,Faridpur to determine the effectiveness of rice bran against weed suppression, rice growth and its impact on yield. Treatments comprise of rice bran applied @ 1.0, 2.0, 3.0, 4.0 and 5.0 t ha^-1and compared with unweeded, weed free and two hand weeding in RCBD design with three replications. Weed control efficiency was increased by increased application rate of rice bran in both years. Application of 5.0 t ha^-1 rice bran reduced weed number and weight about 65% in 2006 and about 61% in 2007 compared with unweeded condition. Panicle number, grains panicle^-1and grain yield were significantly higher in weed free and two hand weeded plots followed by rice bran application at the rate of 0 and 4.0 t ha^-1 in both years. Grain yield of rice increased by the application of 4.0 and 5.0 t ha^-1rice bran over unweeded plot and it appear 27% and 37% increased in 2006 and also shown 26% and 35% yield increased in 2007. This research finding indicates rice bran suppressed weed growth and increased grain yield of rice which have the potential of being used as pre emergence organic herbicides.

Keywords: Rice bran, Weed control, Rice growth, Yield

Location: BRRI, Gazipur and BRRI, Bhanga

Start Date: 01-01-2006

End Date: 01-07-2007

Program Area: Pest Management

Commodity: Weed management, Rice

Objectives:

To evaluate the weed control potentially and growth enhancing ability of rice bran that might be useful for eco-friendly weed control in rice organic systems.

Methodology:

The experiment was conducted at BRRI farm,Gazipur and Bhanga, Faridpur,Bangladesh during the season of Boro 2006 and 2007 respectively to observe the effectiveness of rice bran against weed suppression and its impact on rice yield. The treatments were rice bran applied at the rate of 1.0 ,2.0, 3.0, 4.0, and 5.0 t ha^-1 ,Un weeded (control), Weed free and Two hand weeding.The experiment was laid out in RCB design with three replications. Forty days old seedling of BRRI Dhan29 were transplanted on 15^th January, 2006 at BRRI, Gazipur and 10^th January at BRRI Faridpur farm with 20 cm x 20 cm spacing and 2 seedlings per hill. Rice bran was applied after final land preparation by broadcasting with respective doses in both locations. Two hand weeding have done at 15 and 45 DAT. Weed biomass and number of weeds were assessed at 45 DAT. Random samples were taken from within each plot using a 0.5 x 0.5 m quadrate (Kim and Moody, 1983). Fertilizer was applied following BRRI (Bangladesh Rice Research Institute ) recommended doses. Data on weed infestation were collected from each unit plot before hand weeding done at 45 DAT. Weed control efficiency was calculated using weed dry matter weight data following the formula of Rao (1985).The data were analyzed following analysis of variance (ANOVA) technique and mean differences were adjusted by multiple comparison test (Gomez and Gomez,1984) using the statistical program MSTAT-C. (Russell,1986).

Source of Information:

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 30000

Total Budget (Tk.) : 30000

Achievement/Findings:

Application of rice bran suppressed weed growth and increased grain yield of rice. Rice bran would be used as organic weed suppressing agent. Further evaluation is needed how much micronutrients and other chemicals are released during the decomposition period of rice bran which influenced growth and development of rice plant and suppressed weed growth.

Knowledge Management: Journal