Fertility indicator |
| Grade |
|
Low | Suitable | high | |
OM | <15 | 15 - 30 | ≥30 |
AN | <100 | 100 - 180 | ≥180 |
AP | <15 | 15 - 30 | ≥30 |
AK | <150 | 150 - 220 | ≥220 |
Ca | <6 | 6 - 10 | ≥10 |
Mg | <1.0 | 1.0 - 1.6 | ≥1.6 |
S | <16 | 16 - 30 | ≥30 |
B | <0.3 | 0.3 - 0.6 | ≥0.6 |
Cu | <0.5 | 0.5 - 1.0 | ≥1.0 |
Fe | <4.5 | 4.5 - 10 | ≥10 |
Mn | <10 | 10 - 20 | ≥20 |
Mo | <0.15 | 0.15 - 0.2 | ≥0.2 |
Zn | <1.0 | 1.0 - 2.0 | ≥2.0 |