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Effect of Weed Management Practices on Transplanted Aman Rice

B.K. Mitra
BSMRAU, Gazipur-1703, Bangladesh

A.J.M.S. Karim
BSMRAU, Gazipur-1703, Bangladesh

M.M. Haque
BSMRAU, Gazipur-1703, Bangladesh

G.J.U. Ahmed
Agronomy Division, BRRI, Gazipur-1701, Bangladesh

M.N. Bari
BSMRAU, Gazipur-1703, Bangladesh

Abstract/ Executive Summary:

An experiment was conducted under the Madhupur tract- AEZ-28 at the Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh during June to December 2002. The purpose was to find out the effective weed control practices in terms of weed dynamics, weed control efficiency on the performance of transplanted aman rice. Fimbristylis miliacea, Scirpus murconatus and Monochoria vaginalis were found as dominant weed species in transplanted aman rice. Two times weeding was found as the best practice to keep weed infestation at minimum level and to ensure higher yield of transplanted aman rice. Other than weed free condition, the highest grain yield (5.07 t ha^-1) was produced in two hand weeding and the lowest (2.46 t ha^-1) was in unweeded condition. One hand weeding at 25 DAT along with one mechanical weeding at around 40 DAT was also found to be effective next to two hand weeding in these regards. Pre emergence herbicide Refit 500 EC was not effective to keep weed infestation at minimum level and to ensure higher yield of transplanted aman rice.

Keywords: Weed, Transplanted aman rice, Fimbristylis miliacea, Scirpus murconatus, Weed management

Location: Agronomy Field Laboratory, Bangabandhu Sheikh Mujibur Rahman Agricultural University

Start Date: 00-06-2002

End Date: 00-12-2002

Program Area: Pest Management

Commodity: Rice

Objectives:

To determine the effect of weed control practices on rice
To assess the weed dynamics, weed control efficiency and its performance on transplanted aman rice

Methodology:

The experiment was conducted at the Agronomy Field Laboratory, Bangabandhu Sheikh Mujibur Rahman Agricultural University, under the Madhupur tract- AEZ-28 of Bangladesh during the period from June to December 2002. The experiment was laid out in a split-plot design with three replications. Three rice varieties were imposed as main plot treatment at random. The varieties were BR11 (V₁), BRRIdhan31 (V₂) and Pajam (V₃). Seven weed management treatments such as no weeding (W₁), Weed free (W₂), Two hand weeding at 25 and 40 DAT (W₂), One hand weeding at 25 DAT (W₃), One hand weeding and one mechanical weeding with locally modified weeder at 25 and 40 DAT, respectively (W₅), Refit 500 EC at the rate of 1 L ha^-1 at 7 DAT (W₆) and Continuous flooding and one mechanical weeding by BRRI rice weeder at 40 DAT (W₇) were imposed as sub plot treatment randomly. In the chemical treatment Refit 500 EC at the rate of 1 L ha^-1 was applied as pre-emergence at 7 days after transplanting on 5 cm standing water. Thirty days old seedlings were transplanted with one seedling hill^-1 at a spacing of 20 x 15 cm. Fertilizers were applied as per recommendation of Bangladesh Rice Research Institute as N-P-K-S-Zn at the rate of 70-50-40-10-2 kg ha^-1[5]. Intercultural operations were done as and when required. As weed parameter weeds identification, measurement of weed intensity, weed biomass and weed control efficiency were performed at 30, 60 and 90 DAT. Different crop growth parameters were observed. Finally yield components, grain and straw yield were observed. Analysis of variance was done following the experimental design with the help of the computer package MSTAT. Later the means were separated through LSD test.

Source of Information: Journal of Agronomy, 4: 238-241, 2005; ISSN 1680-8207

Article Link (Online Journal): DOI: 10.3923/ja.2005.238.241; URL: http://scialert.net/abstract/?doi=ja.2005.238.241

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Two times weeding was found as the best practice to keep weed infestation at minimum level and to ensure higher yield of transplanted aman rice in AEZ-28.

Knowledge Management: Journal