1. Soil Science and Agricultural Chemsitry, Bihar Agricultural University, Bhagalpur, India
2. College of Agriculture, Acharya Narendra Deva University of Agriculture & Technology, Ayodhya, India
3. College of Agriculture Kotwa, Acharya Narendra Deva University of Agriculture and Technology, Ayodhya, India
4. Soil Science and Agricultural Chemistry, Rajasthan Agricultural research Institute, Jobner, India