| S1 | S2 | S3 | N | Source |
Rainfall | 250 - 350 mm | 150 - 250 mm 350 - 600 mm | 75 - 150 mm >600 | <75 mm | [20] |
Temperature | 30˚C - 21˚C | 18˚C - 21˚C | 15˚C - 18˚C | <15˚C >30˚C | [21] |
Soil pH | 6.2 - 7.2 | 5 - 6.2 | 7.2 - 8.0 | >8.0 <5.0 | [14] [22] |
Drainage | Well-drained | Imperfectly drained | Poorly drained, Rapidly drained | Very poorly drained | [14] [23] |
Texture | Loam Sandy Loam | Clayey | Very clayey Extremely sandy | - | [14] [23] |
CEC | >10 meq/100g | 5 - 10 meq/100g | 0 - 5 meq/100g | - | [14] [22] |
Depth | >50 cm | 30 - 50 cm | <30 cm |
| [14] [23] |
Altitude | 0 - 1600 m | 1600 - 2000 m | - | >2000 m <0 m | [14] [22] |