1. Soil Science, Water & Fertilizer Research Centre, MARDI, Serdang, Selangor, Malaysia
2. Industrial Crop Research Centre, MARDI, Serdang, Selangor, Malaysia
3. Department of Land Management, Faculty of Agriculture, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
4. Department of Crop Science, Faculty of Agriculture, Universiti Putra Malaysia, Serdang, Selangor, Malaysia