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Impacts of Different Competition Period of Echinochloa Crusgalli on Plant Characters and Critical Period of Weed Control on Transplanted Aman Rice

Rakiba Shulatana
Senior Scientific Officer
Agronomy Division, BRRI, Gazipur

Dr. Md Abdul Jalil Mridha
Cheif Scientific Officer
Agronomy Division, BRRI, Gazipur

Abstract/ Executive Summary:

An experiment was conducted at Agronomy Research field, Bangladesh Rice Research Institute, Gazipur during the year 2012 to determine the growth behavior of transplanted aman rice under different competition durations with Echinochloa crusgalli. The aman season rice variety BRRI dhan56 was used to fulfill the goal. Different durations of weed interference (20 DAT, 40 DAT, 60 DAT and throughout) and weed free period were imposed to understand the impact of time on crop characters and yield of rice. The results revealed that all the growth characters LAI, LAD, DMA, CGR and NAR were reduced with prolonged weed competition. However panicle/m², grains/panicle, grain yield were also reduced with increasing period of rice-weed competition. Echinochloa crusgalli is a severe competitor of rice even at early growth stage because all the growth parameters of the rice crop were significantly suppressed by the increasing trend of rice-weed competition durations. Therefore, Echinochloa crusgalli should be controlled as early as possible for good vegetative growth of rice crop. It can be concluded that in case of short duration aman variety like BRRI dhan56 weed competition can be allowed not more than 20 days after transplanting.

Keywords: Transplanted aman, LAI, Echinochloa crusgalli, Rice.

Location: Agronomy Research field, Bangladesh Rice Research Institute, Gazipur

Start Date: 15-07-2012

End Date: 15-07-2013

Program Area: Pest Management

Commodity: Infestation

Objectives:

To determine the growth behavior of transplanted aman rice under different competition durations with Echinochloa crusgalli.

Methodology:

The study was conducted at Agronomy Research field, Bangladesh Rice Research Institute, Gazipur during the year 2012. The soil is clay in texture having pH of 7.85 and organic matter content is 0.70%.The treatments consisted competition durations of 0, 20, 40, 60 days and Throughout the growing period. Weeds were removed by hand weeding on the expiry of each duration of rice barnyard grass association. The experiments were laid out in RCBD with three replications. The crop was fertilized at @120-60-60 kg NPK ha^-1. All P and K was applied at the time of transplanting the rice nursery. Nitrogen was applied in two equal splits i.e. 1/2 at transplanting and 1/2 at tillering stage. The plot size was 3 m x 2 m. Drought tolerant rice variety BRRI dhan56 was used as a test crop. The nursery was sown in the 1st week of June each year. About one-month old seedlings were transplanted at 20 cm x 20 cm hills. Seed of barnyard grass was broadcast in the experimental plots and the barnyard grass density was maintained as 25 plants m-2. The other weed plants were eradicated manually soon after germination

Source of Information: American Open Journal of Agricultural Research, Vol. 1, No. 5, September 2013, pp: 14-23

Article Link (Online Journal):

Funding Source:

1. Government

Budget: Thirty thousand

Total Budget (Tk.) : Thirty thousand

Achievement/Findings:

Echinochloa crusgalli should be controlled as early as possible for good vegetative growth of rice crop. It can be concluded that in case of short duration aman variety like BRRI dhan56 weed competition can be allowed not more than 20 days after transplanting.

Knowledge Management: Journal