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Development of Suitable Salinity Management Techniques and Their Environmental Impact Assessment on the Coastal Eco-system of Bangladesh:salinity of Soil, Groundwater and River-1999

Dr Manoranjan Mondal
SSO
Irrigation and Water Management Division,, BRRI, Gazipur-1701, Bangladesh .

Abstract/ Executive Summary:

A study was undertaken to determination the surface and groundwater salinity variation pattern. Daily monitoring was done in the study site for salinity level. Soil salinity was measured at the beginning and middle of the rice-growing season. Soil samples were collected once in every month at the later part of the rice season. Top soil (0-15 cm) salinity ranged from 2.4-3.3 dS/m during the Aman season. In 1999 dry season, samples were collected once in every month from each experimental unit. Topsoil salinity in the plowed land and in raised bed was about 30-40% lower than the non-plowed land. Groundwater depths were measured once in every week and salinity once in each month from observation wells installed at Barodanga. Most of the time watertable was at the ground surface during the Aman season, except in December it was 8.0 cm below the surface. Groundwater salinity was within 1.68-1.75 dS/m throughout the growing season of rice. In 1999 dry season, groundwater depth at Barodanga and Kismat Fultola was within 1.5 m from the surface. Although the depth of groundwater at both locations was similar, its salinity level varied considerably. At Barodanga, groundwater salinity ranged between 1.65-1.87 dS/m and at Kismat fultola the values were within 11.65-13.14 dS/m from January to June 1999. Salinity of the river Kazibacha was measured once in every week. The peak salinity of the river water was about 25.0 dS/m in April. Salinity of the river water showed decreasing trend at the on-set of the monsoon and it was about 2.0 dS/m in June.

Keywords: Coastal zone, Water productivity, Salinity

Location: Batiaghata, Khulna

Start Date: 01-07-1998

End Date: 30-06-1999

Program Area: Risk Management in Agriculture

Commodity: Command area development

Objectives:

To determine the surface and groundwater salinity variation pattern

Methodology:

Monitoring of soil salinity, river water salinity and groundwater salinity was done. Soil salinity was measured at the beginning and middle of the rice-growing season. Soil samples were collected once in every month at the later part of the rice season. Groundwater depths were measured once in every week and salinity once in each month from observation wells.

Source of Information: Proceedings of the BRRI Annual Review for 1999, BRRI, Gazipur-1701, Bangladesh

Article Link (Online Journal):

Funding Source:

1. Bangladesh Agricultural Research Council

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Top soil (0-15 cm) salinity ranged from 2.4-3.3 dS/m during the Aman season. Topsoil salinity in the plowed land and in raised bed was about 30-40% lower than the non-plowed land. Most of the time watertable was at the ground surface during the Aman season, except in December it was 8.0 cm below the surface. Groundwater salinity was within 1.68-1.75 dS/m throughout the growing season of rice. In 1999 dry season, groundwater depth at Barodanga and Kismat Fultola was within 1.5 m from the surface. At Barodanga, groundwater salinity ranged between 1.65-1.87 dS/m and at Kismat fultola the values were within 11.65-13.14 dS/m from January to June 1999. The peak salinity of the river water was about 25.0 dS/m in April. Salinity of the river water showed decreasing trend at the on-set of the monsoon and it was about 2.0 dS/m in June.

Knowledge Management: Report/Proceedings