ID | Parameter | Method | Reference |
1 | pH | 1:2.5 soil/water | (Thomas, 1996) |
2 | Exchangeable bases | NH4OAc saturation method | (Chapman, 1965) |
3 | Soil organic matter | Walkley-Black wet digestion | (Walkley & Black, 1934) |
4 | Total nitrogen | Kjeldahl analysis | (Mulvaney, 1982) |
5 | Available phosphorus | Olsen’s method | (Troug, 1930) |
6 | Particle Size | Pipette Method | (Kettler, 2001) |
7 | Bulk Density | Undisturbed Core Method | (Blake, 1986) |
8 | Cu, Zn and Fe | (DTPA) extraction method | (Udo, bia, Ogunwale, Ano, & I.E. Esu, 2009) |