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Economic Threshold Density of Multi Species Weed for Direct Seeded Rice

Md. Abdullah Al Mamun,
Former SSO,
Agronomy Division,BRRI, Gazipur

M A J Mridha
CSO & Head
Agronomy Division,BRRI, Gazipur

Rakiba Shultana
SSO
Agronomy Division,BRRI, Gazipur

Abstract/ Executive Summary:

Two experiments were conducted in 2009 and 2010 at central part of Bangladesh to examine the effects of multi species weeds on grain yield and to determine the economic threshold (ET) of weeds in direct seeded rice. The treatments consisted of 0, 5, 10, 20, 40, 80, 160 weeds m^-2 and control (unweeded). Scirpus maritimus L. and Cyperus difformis L. were the most dominant weed species in year 1 and 2, respectively. Grain yield losses due to weed interference increased with weed population density increase. Panicle m^-2, grains panicle^-1, 1000-garin weight and grain yield varied significantly due to different weed density in both years of the study. Estimated ET were 5 and 7 weeds m^-2 in year 1 and 2, respectively, assuming a weed free rice grain yield 5 ton ha^-1, a crop price $ 210 ton^-1, and weed control cost $ 30 ha-1.

Keywords: Economic thresholds, Direct seeded rice, Yield loss, Weeds

Location: BRRI, Gazipur

Start Date: 00-00-2009

End Date: 00-00-2010

Program Area: Pest Management

Commodity: Rice

Objectives:

To determine the economic threshold (ET) of weeds in direct seeded rice (DSR)

Methodology:

Two field experiments were conducted at research farm of Bangladesh Rice Research Institute, Gazipur during Aman season in 2009 and 2010. The experiment was laid out in a Randomized complete block design (RCBD). Net plot size was 1m x 1m. Rice variety BRRI dhan29 was used as a test crop. The treatments consisted of 5, 10, 20, 40, 80 and 160 of multi species weed per m² as compared with weedy and weed-free check treatments. Fertilizers such as nitrogen, phosphorus and potassium (N, P, and K) and sulphur (S) were applied at 100, 15, 40 and 5 kg/ha, respectively. The whole phosphorus and potassium and one third of nitrogen were applied at the time of sowing. The remaining doses of nitrogen were applied in two splits at tillering and panicle initiation, respectively. The crop was harvested at maturity. The data were analyzed following analysis of variance (ANOVA) and the statistical program MSTAT-C. Regression model was simulating with yield losses and dry matter of weeds. Economic threshold density was determined using stadard euation.

Source of Information: Asian Journal of Agriculture and Rural Development, 3(8) 2013: 523-531

Article Link (Online Journal):

Funding Source:

1. Government

Budget: Twenty five thousands taka

Total Budget (Tk.) : Twenty five thousands taka

Achievement/Findings:

Due to presence of weeds, yield losses occur in lowlands situation whatever it is rainfed or irrigated systems. This situation is more severe in direct seeded systems. This will lead to the rationalization of herbicide use and the reduction of herbicide input into the environment.

Knowledge Management: Journal