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Weed Flora in Transplant Aman Rice Under Old Brahmaputra Floodplain Soils of Bangladesh

M.Z. Iqbal
Department of Agronomy, Bangladesh Agricultural University Mymensingh-2202, Bangladesh

M. Begum
Department of Agronomy, Bangladesh Agricultural University Mymensingh-2202, Bangladesh

A.A. Mamun
Department of Agronomy, Bangladesh Agricultural University Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

An on-farm site specific weed survey was conducted. in transplant aman rice under Old Brahmaputra Floodplain (OBFP) agro-ecological zone (AEZ). In unweeded plots of transplant aman rice the infesting weed species were 38 belonging to 18 families of which 29 were annual against 9 perennial; whereas in farmer's weeded plots there were 37 species of weeds with 30 annuals and 7 perennials belonging to 16 families. Garmineae and cyperaceae contributed to the maximum number of weed species and annuals outnumbered the perennials in both of unweeded and farmer's weeded plots. The ranking of the important weeds on the basis of their relative abundance values of unweeded plots were Fimbristylis miliacea (40.83) > Cyperus iria (10.50) > Monochoria hastata (10.44) > Myriophyllum indicum (7.19) > Marsilea crenata (4.08) ; those of farmer's weeded plots were Myriophyllum indicum (25.51) > Fimbristylis miiaceae (18.32) > Lagarosiphon alternifolia (8.64) > Cyperus difformis (4.46) > Lindernia antpoda (5.60). Sedges and Broadleaves were important weeds in unwedded and farmers, weeded fields respectively.

Keywords: Weed flora, Transplant aman rice, Old Brahmaputra Flood plain AEZ

Location: Two selected villages under Old Brahmaputra Floodplain.

Start Date: 00-00-1992

End Date: 00-00-1993

Program Area: Pest Management

Commodity: Infestation

Objectives:

To investigate the distribution of weed flora growing in farmer's field of T. aman rice under Old Brahmaputra Floodplain agro-ecological zone of Bangladesh.

Methodology:

An on-farm site specific weed survey was conducted during T. aman season in 1992 and 1993 in the farmers field with the direct participation of the farmers in two selected villages under Old Brahmaputra Floodplain. The data of infesting weed species represent the average value of two years. For the experiment four fields from four farmers of each village were selected and each field was treated as a separate replication. Each field was divided into 3 unit plots where the weeding treatment were superimposed. The three superimposed weeding treatments were i) weed free ii) farmers weeding and iii) unweeded check. Weed infestation data were collected randomly by using 0.25m²quadrat from three spots in each field from the unweeded and farmers' weeded strip at the flowering stage of the rice plants as suggested by Cruz et al. (1986). The weeds in each quadrat were uprooted, washed and sundried, and weight was taken species-wise. Weed density/m² was determined from the average weed count of three samples multiplied by 4. The relative dry weight (RDW) or importance value (I.V.) of each species growing with the crop in each AEZ was determined.

Source of Information: Bangladesh J. Agril. Sci. 30(2): 299-304, July, 2003

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In Old Brahmaputra Floodplain agro-ecological zone, 38 different weed species belonging to 18 families of which, 29 annuals against 9 perennials were found to infest the unweeded plots of transplant aman rice. In case of farmer's weeded plots 37 weed species with 30 annals and 7 perennials belonging to 16 families were found to infest the crop. The species of Cyperaceae (7 spp.) Was dominant followed by Gramineae (6 spp.), Scrophulariaceae (4 spp.), Lythraceae (3 spp.), Amaranthaceae (2 spp.), Pontederiaceae (2 spp.), Alismataceae (S spp.) and Parkariaceae (2 spp.) in both the unweeded and farmers weeded plots. Only one species represented the rest of the families.

Knowledge Management: Journal