Soil Mapping in Bangladesh
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Electromagnetic induction (EMI) survey was conducted in the terrace and floodplain soils of Bangladesh by using a soil sensor, EM38. The soil apparent electrical conductivity (ECa) readings in the vertical orientation (ECa-V) of measurement ranged from 40 to 64 mS m-1 while readings in the horizontal orientation (ECa-H) ranged from 32 to 53 mS m-1 in the terrace site. In the floodplain site, the ECa-V readings ranged from 33.8 to 47.4 mS m-1 and ECa-H readings from 35.1 to 50.8 mS m-1. The EM38 response to soil conductivity was relatively higher for the vertical orientation than the horizontal...
Electromagnetic induction (EMI) survey was conducted in the terrace and floodplain soils of Bangladesh by using a soil sensor, EM38. The soil apparent electrical conductivity (ECa) readings in the vertical orientation (ECa-V) of measurement ranged from 40 to 64 mS m-1 while readings in the horizontal orientation (ECa-H) ranged from 32 to 53 mS m-1 in the terrace site. In the floodplain site, the ECa-V readings ranged from 33.8 to 47.4 mS m-1 and ECa-H readings from 35.1 to 50.8 mS m-1. The EM38 response to soil conductivity was relatively higher for the vertical orientation than the horizontal orientation in the terrace site. But in the floodplain site, the ECa-H response was slightly higher than the ECa-V. In the terrace site, the ECa readings correlated best with soil property such as top-, sub-, and deepsoil texture (clay and sand), and topsoil chemical property, i. e. pH, CEC, Ca2+ and Mg2+. In the floodplain site, the ECa readings correlated best with top- and deepsoil texture, and topsoil organic C. A modest correlation was found in the terrace site between ECa-V and the subsoil clay (r = 0.78), and ECa-V and the subsoil sand (r = - 0.84).
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