Effect of water logging in southwest coastal region of Bangladesh
M.A.H. Gazi1, S.M. Moniruzzaman1,*, M.S. Islam2
Siltation of the Kobadak River is the main cause of water logging.
Chloride concentration of water is found below 140 mg/l.
Nitrogen content of the soil is less than the optimum limit.
Calcium, potassium, and magnesium concentrations of the soil exceed the optimum limit.
Farmers are changing their occupation.
In the recent years, the southwest coastal area of Bangladesh has been seriously affected due to the water logging. The aim of the study is to investigate the impact of water logging with view of the structural and economical losses, and with a view of the salinity and acidic related variables in soil solution associated to plant nutrients. To fulfill the objectives of the study, both primary and secondary data are collected from the study area. Household survey through questionnaire is performed to collect the required information from the affected people. Frequently field visits, key informant interviews, soil and water sample testing are also performed. According to the opinion of 77% respondent among the total 230 respondents, the siltation of the Kobadak River is the main cause of water logging. Farmers are changing their occupation, and only 16% of people are taking farming as the main occupation and about 60% of people living with day-labour occupation. According to respondents view on the land use of the study area, on an average 13% is for residential, 36% is for agricultural, 40% is lowland, and 12% is for others, e.g. river, canal, pond and lake, etc. Chloride concentration is found as below 140 mg/l from all the water samples of the study area. The minimum value of sodium adsorption ratio is found as 0.54 meq/l and the maximum value is found as 8.7 meq/l. Nitrogen content is less than the optimum limit and potassium content is greater than the optimum limit of the soil sample. Phosphorus content in Kumira and Gopalpur unions is within the limit but in Tala and Tenulia unions exceeds the optimum limit. In addition, calcium and magnesium contents of the soil sample exceed the optimum limit at all the locations.