1. a Institute of Environmental Studies and Wetland Management , Salt Lake City , Calcutta , India
2. b Department of Agril Statistics , Bidhan Chandra Krishi Viswavidyalaya , Mohanpur , West Bengal , India
3. c Department of Agricultural Chemistry and Soil Science , Calcutta University , Calcutta , India
4. d Department of Agronomy , Bidhan Chandra Krishi Viswavidyalaya , Mohanpur , West Bengal , India