1. Department of Soil Science and Agricultural Chemistry, University of Agricultural Sciences, Bangalore, India
2. Krishi Vigyan Kendra, Bhagwanpur Hat, Siwan-Dr. Rajendra Prasad Central Agricultural University, Pusa, Samastipur, India
3. ICAR-National Bureau of Soil Survey and Land Use Planning, Regional Centre, Bangalore, India
4. Krishi Vigyan Kendra, Birauli, Samastipur-Dr. Rajendra Prasad Central Agricultural University, Pusa, Samastipur, India
5. Department of Soil Science and Agricultural Chemistry, Keladi Shivappa Nayaka University of Agricultural and Horticultural Sciences, Shimoga, India