1. ETH Zurich, Institute of Agricultural Sciences, Group of Plant Nutrition, Lindau, Switzerland
2. Department of Agriculture, Field Crops Research and Development Institute, Mahailluppallama, Mahailluppallama, Sri Lanka
3. Department of Plant Sciences, Faculty of Agriculture, Rajarata University of Sri Lanka, Puliankulama, Anuradhapura, Sri Lanka
4. Department of Crop Science, Faculty of Agriculture, University of Peradeniya, Peradeniya, Sri Lanka