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Sedimentation Enriches Flood Plain Soils

A L Shah
Soil Science Division, BRRI, Gazipur, Bangladesh

M S Rahman
Soil Science Division, BRRI, Gazipur, Bangladesh

M Ishque
Soil Science Division, BRRI, Gazipur, Bangladesh

G M Panullah
Soil Science Division, BRRI, Gazipur, Bangladesh

Abstract/ Executive Summary:

Every season BRRI Habiganj farm receives sediment around 2 t/ha due to flood which added a mean of total N , 20.14 kg; available P, 0.41 kg; exchangeable K, 1.89 kg; available S, 0.17 kg and available Zn , 0.05 k g/ha, respectively. Addition of such an amount of NPKSZn by deposition every season may contribute to fertility of the farm soil to sustain longer fertility maintenance. Rice grain yield of 4.8 t/ha in a long-term NPKSZn missing element experiment indicated higher fertility of the farm soil might be the outcome of every years deposition of sediment due to flood.

Keywords: Sedimentation, Annual deposition, Major nutrients

Location: BRRI Habiganj farm

Start Date: 00-07-1992

End Date: 00-10-1996

Program Area: Crop-Soil-Water Management

Commodity: Land development productivity

Objectives:

To quantify the annual deposition of major nutrients by sedimentation in this area.

Methodology:

Collection of sediment Just after entrance of floodwater at BRRI Habiganj farm, 12 plastic bowls were placed under water accordingly to evaluation around the floodwater measuring pole. After receding floodwater, the plastic bowls with water were taken in the net house and then kept open under sun to evaporate water for drying. When water completely evaporated, small snail and other visible debris were removed by hand and kept for complete sundry, after that weight was taken. Surface areas of the upper portion of plastic bowls were measured & converted weight as per hectare. Collected sediment samples were composited and analyzed in the laboratory for some total and available nutrient.

Source of Information: Bangladesh Rice J. II (Special Issue) : 49-5I, 2002

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The annual sediment deposition during 1992 to 1996, which varied from 515 kg/ha to 2250 kg/ha. Exceptionally very low silt deposition in 1994 might be the shallow flooding depth. This means that depth of flooding or volume of floodwater played an important role in deposition of sediments at a particular place. The chemical analyses of sediment showed a higher content of total & available NPKSZn than farm soil. Five years result indicated mean deposition of NPKSZn at the rate of 20.14-0.41-1 9-0. 17-0.05 kg/ha. The high humus content and available NPKSZn content of the sediment may contribute to potential fertility of the farm soil to sustain productivity maintenance.

Knowledge Management: Journal