1. Department of Crop Management, Agriculture College and Research Institute, Tamil Nadu Agricultural University, Kudumiyanmalai, India
2. Department of Soil Science and Agricultural Chemistry, S. Thangapazham Agriculture College, Vasudevanallur, Thenkasi, India
3. Department of Soils and Environment, Agriculture College and Research Institute, Tamil Nadu Agricultural University, Madurai, India
4. Department of Soil Science and Agricultural Chemistry, Agriculture College and Research Institute, Tamil Nadu Agricultural University, Vazhavachanure, India