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Integrated Crop and Nutrient Management for Increasing the Productivity of the Coastal Saline Soils of Bangladesh- Investigation for Suitable Groundwater in the Coastal Areas for Crop Production-2004

Dr. M Samsur Rahman
PSO
Soil Science Division, BRRI, Gazipur

Dr. M A Rashid
CSO and Head
IWMD, BRRI, Gazipur

Abstract/ Executive Summary:

This study was conducted at Munshiganj area, Satkhira with the objectives to find out (if any) suitable groundwater for irrigation at any reasonable depth; to practically examine the suitability of groundwater for dry season rice cultivation in Munshiganj area, Satkhira; and to increase crop production, cropping intensity and the long-term environmental impacts of the study. The study reveals that the pond water in Munshiganj area was less saline during the whole year. The EC of the collected pond water samples varied from 0.72 dS/m to 1.79 dS/m, which was much below the maximum permissible limit (4 dS/m). The pond water salinity was maximum in March/April and minimum in September/October. The above results indicated that the pond water in Munshigaj area remains within the permissible limit throughout the year and is suitable for irrigation. Water of the river Maloncho, near Munshigaj was found to be highly saline during the whole year and was unsuitable for irrigation. The salinity of the river water varied from 6.57 dS/m to 23.79 dS/m, which was above the permissible limit (4 dS/m). Salinity of the river water started to increase from December and continued up to April, It then started to decrease again from May and the minimum value was found in November which also remained unsuitable for irrigation.

Keywords: Suitable groundwater, Crop production, Cropping intensity and Environmental impacts

Location: Munshiganj area, Satkhira

Start Date: 01-07-2003

End Date: 30-06-2004

Program Area: Crop-Soil-Water Management

Commodity: Groundwater

Objectives:

To find out (if any) suitable groundwater for irrigation at any reasonable depth;
To practically examine the suitability of groundwater for dry season rice cultivation in Munshiganj area, Satkhira; and
To increase crop production, cropping intensity and the long-term environmental impacts of the study.

Methodology:

This study was conducted at Munshiganj area, Satkhira. The salt concentration samples of water of different sources (pond water, river water and groundwater) of Munshiganj area were collected from in each month. The electrical conductivity (EC) of the samples was expressed in deci Siemen per metre (dS/m).

Source of Information: Proceedings of the BRRI Annual Internal Review, 2004

Article Link (Online Journal):

Funding Source:

1. World Bank

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The groundwater, was highly saline throughout the year. The minimum salinity was 8.26 dS/m in November and the maximum was 16.35 dS/m in April. All of these hand tubewells pumped water from the shallow aquifer (20 m- 25 m depth). The results revealed that in Munshiganj area the groundwater salinity of shallower aquifer is severe throughout the year and not suitable for irrigation. A fresh water bearing aquifer was found at a depth of 60 m (200 ft) from the soil surface. This result indicated that it is possible to grow rice successfully in dry season by utilizing the groundwater of good quality from the deeper aquifer. The total area coverage was about 30 ha and the average yield of rice (paddy) was around 3.0 t/ha. It is expected that the farmers will be able to grow rice successfully in the coming dry seasons by using the groundwater. The dry season crop cultivation in the saline zone will help to improve the livelihood of the resource poor farmer by increasing yearly total production of rice in two seasons instead of the existing single season.

Knowledge Management: Report/Proceedings