1. Institute of Advanced Technology (ITMA), Universiti Putra Malaysia, Serdang, Selangor, Malaysia
2. Department of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
3. Department of Land Management, Faculty of Agriculture, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
4. Product technology, Urea, Ammonia and Other Fertilizers, Technology and Innovation Department, Petronas Chemicals Group Bhd, Wilayah Persekutuan Kuala Lumpur, Malaysia