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Spatial Variability of Arsenic in Soils in Arsenic Contaminated Shallow Tube Well Command Areas Used for Irrigated Wetland Rice Cultivation for the Year 2003-04

Debi Narayan Rudra Pual
CSO
Head, Agril. Statistics Division Bangladesh Rice Research Institute (BRRI) Gazipur-1701

Md. Shahjahan Kabir
SSO
Agril. Statistics Division Bangladesh Rice Research Institute (BRRI) Gazipur-1701

Abstract/ Executive Summary:

The experiments were carried out during the Boro season 2003 and 2004 in four Shallow Tube Well (STW) command areas: B. Baria and Faridpur Sadar upazila, the smallest administrative unit in Bangladesh. Each command area was grided by 20m distance and the sampling points were georeferenced by a global positioning system (GPS). Composite soil samples (0-15 cm), Plants and water samples were collected from the grids. The concentrations of Arsenic (As) in both the locations varied widely. The positive correlations among the soil, grain and straw As concentration are highly significant in both the locations. Arsenic can enter into the edible plant parts and is influenced by soil As content. High concentration of As in rice straw can influence the translocation of As to grain. The spatial dependency of soil arsenic gives an indication that longer irrigation channels or ponded ground water prior to irrigation and discouraging standing water for long periods in rice fields could be positive measures in reducing arsenic loading in irrigated rice soil. In that case alternate wetting and drying (AWD) method can be a remedial measure to reduce As contamination in soil as well as food chain.

Keywords: Arsenic, Irrigation , Spatial variation, Soil

Location: All over the Bangladesh

Start Date: 00-00-2003

End Date: 00-00-2004

Program Area: Risk Management in Agriculture

Commodity: Contamination of soil

Objectives:

The study was undertaken to map the spatial distribution of arsenic concentration in the soils in the command area of a single arsenic contaminated STW.

Methodology:

Ground water irrigated rice fields of four different locations were intensively sampled on regular grid spacing during Boro 2003. Soil samples were collected from grid points geo-referenced by GPS for As analysis. Composite soil samples (0-15 cm) were collected from the grids. Semivariograms were calculated to evaluate the spatial variability of soil As for each individual site by GS+ 5.3.2. Maximum lag distance and lag interval for the semi variance were determined interactively to best fit the model having highest R² and the lowest residual sum of squares (RSS) values. Kriging interpolation was performed to spatially describe the distribution of As concentration in topsoil.

Source of Information: BRRI Annual Report 2003-04

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The spatial dependency of soil arsenic gives an indication that longer irrigation channels prior to inlets into rice fields and discouraging standing water for long periods in rice plots could be positive measures in reducing arsenic loading in irrigated rice soils.

Knowledge Management: Report/Proceedings