Soil and Water Salinity, Their Management in Relation to Climate Changes in Coastal Areas of Bangladesh

Abstract

Climate change due to global warming and its negative consequence on environment and agro ecosystem is a serious concern of global community of current age. To assess the present soil and water salinity status in coastal areas a soil survey work following standard methods has been completed by Soil Resource Development Institute (SRDI) in 2009. It was observed that out of 2.86 million hectares of coastal and offshore lands about 1.056 million ha of arable lands are affected by varying degrees of salinity. A comparative study of the salt affected area between 1973 to 2009 showed that about 0.223 million ha (26.7%) new land was affected by various degree of salinity during last four decades . It was also observed that about 0.035 million hectares of land (3.5%) new land was affected by various degrees of salinity during last 9 years only (2000-2009). High amount of S and high pH may be the possible causes for P deficiency in coastal areas. Coastal soils are rich in micronutrient elements except Zn. In shrimp cultivated areas flooding with high saline water for a considerable time in each year causing higher soil salinity in all the horizons. A long term soil and water salinity monitoring data of SRDI shows that soil and water salinity between 1991 and 2008 has increased at least 2-10 times. Several common and location specific agricultural constraints have been identified in the field through field investigation/observation and farmer’s interview. Proper fertilizer management practices need to be addressed in coastal saline areas.
 

Soil salinity management practices in coastal area of Bangladesh: a review

“…It is anticipated that the withdrawal of fresh river water from upstream, irregular rainfall, the introduction of brackish water for shrimp cultivation, faulty management of the sluice gates and polders, regular saline tidal water flooding in an unprotected area, the capillary rise of soluble salts etc. are the leading causes of increasing soil salinity in the top soils of the coastal region (Ahsan and Bhuiyan, 2010). Soils can be saline due to geo-historical processes or human-induced.…”

Crash Contributing Factors and Patterns Associated with Fatal Truck-Involved Crashes in Bangladesh: Findings from the Text Mining Approach

“…Figure 3 shows the spatial distribution of truckinvolved fatalities and injuries in Bangladesh. The top five districts in which truck-involved fatalities and injuries occurred were Jhenaidah (84), Sylhet (44), Bogra (40), Dhaka (36), and Jashore (35).…”

Performance valuation of onion (Allium cepa L.) genotypes under different levels of salinity for the development of cultivars suitable for saline regions

“…In Bangladesh, onion is being grown all over the country, but production is hampered in saline-prone areas around the coastal belt as it is a glycophytic crop. A total of 1.06 million ha of land area (32% of the total coastal and offshore land) in the country is affected by different degrees of salinity (Ahsan and Bhuiyan, 2010;SRDI, 2010;Parvin et al, 2017). Soil salinity was classified by Soil Research Development Institute (SRDI) (2010) as non-saline (2.0-4.0 dS m −1 ), very slightly saline (4.1-8.0 dS m −1 ), moderately saline (8.1-12.0 dS m −1 ), strongly saline (12.1-16.0 dS m −1 ), and very strongly saline (>16 dS m −1 ), which occupied approximately 0.328 (31%), 0.274 (26%), 0.190 (18%), 0.162 (15%), and 0.102 (10%) m ha of land, respectively (Ahsan and Bhuiyan, 2010;SRDI, 2010).…”