1. Department of Agriculture, Horticultural Crop Research and Development Institute, Gannoruwa, Sri Lanka
2. Postgraduate Institute of Agriculture, University of Peradeniya, Peradeniya, Sri Lanka.
3. Department of Soil Science, Faculty of Agriculture, University of Peradeniya, Peradeniya, Sri Lanka.
4. Ministry of Agriculture, “Govijana Mandiraya”, Rajamalwatta Lane, Battaramulla, Sri Lanka.