SOIL AND GROUND WATER APPRAISAL OF LEVEL BARIND TRACT AND NORTH — EASTERN BARIND TRACT FOR IRRIGATED AGRICULTURE

Abstract

A study was conducted to assess the quality of the soil and groundwater collected from three thana of Dinajpur district in Bangladesh. 55 water samples and 15 soil samples were collected from different locations for chemical analyses. The standard parameter were pH, EC, TDS, Hr, Ca, Mg, Fe, Mn, Cu, Cl, HCO3, CO3. SO,4, NOs, etc. The pH value indicated that the water was all most neutral to slightly alkaline. Grading based on B and SSP reflected that all water was good to excellent classes. Rating on TDS and SAR categorized the water as excellent. In respect to hardness, water was moderately hard to soft class. All water was free from RSC and belongs to the suitable category. EC and SAR revealed that water samples were medium salinity and low alkalinity nature and was expressed as C,S;. Other micronutrient like Fe, Zn, Mn and Cu were within the safe limit for irrigating all types of agricultural crops. According to drinking standard, some of the water was detected due to higher concentration of Fe and Mn ions. Other pollutant likes Cl, Cu, Zn and SO, were within the safe limit. The soil of the Dinajpur district was slightly acidic in reaction. The increasing tendency of EC in soil of the study area might lead to soil salinity problem in future. The concentration of P, S, Ca, Mg, Na, K, Na, Fe, Zn, Mn and Cu increased significantly. Organic carbon and total nitrogen exhibited slight or no remarkable change due to longterm irrigation.