Soil fertility level | OC (%) | Nitrogen | Av. P (P2O5) | Av. K (K2O) | Ca2+ | Mg2+ | K+ | CEC |
---|---|---|---|---|---|---|---|---|
kg/ha | Exchangeable cations (me/100 g soil | |||||||
Very high | > 1.00 | > 700 | > 80.0 | > 360 | > 20 | > 8 | > 1.2 | > 40 |
High | 0.81–1.00 | 561–700 | 64–80 | 301–360 | 10–20 | 3–8 | 0.6–1.5 | 25–40 |
Medium | 0.61–0.80 | 421–560 | 48–64 | 241–300 | 5–10 | 1.5–3 | 0.3–0.6 | 15–25 |
Low | 0.21–0.60 | 141–420 | 16–48 | 121–240 | 2–5 | 0.5–1.5 | 0.12–0.3 | 5–15 |
Very Low | < 0.20 | < 140 | < 16.0 | < 120 | < 2 | < 0.5 | < 0.12 | < 5 |