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Effect of Different Level of Arsenic Containing Water Management Techniques on Rice Yield and Its Arsenic Content

A. Latif Shah
Chief Scientific Officer
Soil Science Division, BRRI, Gazipur

Zakiul Hassan
Scientific Officer
Soil Science Division, BRRI, Gazipur

S. M. Mofijul Islam
Scientific Officer
Soil Science Division, BRRI, Gazipur

M. Sajidur Rahman
Senior Scientific Officer
Soil Science Division, BRRI, Gazipur

Abstract/ Executive Summary:

Objective of this study was find out a suitable water management technique to mitigate As contamination in soil as well as in rice plant. The experiment was set up at BRRI farm Bhanga, Faridpur during Boro, 2010-11 and Boro, 2011-12 where the concentration of soil As was 12.7 ppm. The experimental design was RCBD with three replications. The test variety was BRRI dhan28. Continuous standing water (CSW) condition with As containing ground water apparently showed little bit higher As content in straw and paddy than surface water irrigation irrespective of alternate wetting and drying (AWD) and CSW.

Keywords: Alternate wetting and drying, Irrigation, Boro season

Location: BRRI farm Bhanga, Faridpur

Start Date: 01-07-2012

End Date: 30-06-2013

Program Area: Crop-Soil-Water Management

Commodity: Contamination

Objectives:

To find out a suitable water management technique to mitigate As contamination in soil as well as in rice plant.

Methodology:

The experiment was set up at BRRI farm Bhanga, Faridpur during Boro, 2010-11 and Boro, 2011-12 where the concentration of soil As was 12.7 ppm. The experimental design was RCBD with three replications. The test variety was BRRI dhan28. Two water management methods: AWD and CSW were maintained with two sources of water, namely, ground water (GW) and surface water (SW) containing 419 ppb and 25 ppb As, respectively. The rates of fertilizers were N, P, K, S and Zn @ 115-20-60-12-3 kg/ha from urea, TSP, MP, gypsum and zinc sulfate, respectively. Irrigation water was continuously applied during the first 2 weeks in all the plots. However, after 2 weeks, AWD plots received irrigation water only after the recession of the standing water to 15 cm depth. From panicle initiation to maturity, standing water was kept again in all plots. Both initial and post-harvest soil samples were collected for As analysis. At maturity, the crop was harvested and grain and straw yields were recorded. Samples were dried and processed before digestion in tri-acid mixture for As-analysis.

Source of Information: Proceedings of BRRI Annual Internal Review for 2012- 2013

Article Link (Online Journal):

Funding Source:

1. Bangladesh Agricultural Research Council

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The grain yield of BRRI dhan28 significantly decreased with high arsenic containing ground water irrigation in CSW system in Boro 2010-11 but a slight decrease in yields was observed in Boro2011-12 compared to low arsenic containing surface water irrigation. Such decrease in yield was not observed with AWD irrigation system. After second crop, the post-harvest soil analysis indicates a general trend of decreasing arsenic content compared to initial and post-harvest soil of first crop irrespective of water source or management and consequently less arsenic was found in straw and paddy samples of the second crop than that of first crop. Apparently slightly higher arsenic content in soil, straw and paddy was observed in CSW method with ground water irrigation. However, this experiment requires long term monitoring for further confirmation.

Knowledge Management: Report/Proceedings, Booklet/Leaflet