1. a National Bureau of Soil Survey and Land Use Planning (ICAR) , Block‐DK, Sector‐II, Salt Lake City, Kolkata, West Bengal , 700091 , India
2. b Department of Agronomy , Bidhan Chandra Krishi Viswavidyalaya , Mohanpur, West Bengal , India
3. c Department of Agricultural Chemistry and Soil Science, University College of Agriculture , Calcutta University , 35 B.C. Road, Kolkata, 700019 , West Bengal , India
4. d Department of Geology and Geophysics , Indian Institute of Technology , Kharagpur, 721302 , West Bengal , India
5. e Department of Earth Science , University of Western Ontario , London , Canada