Soil-site characteristics | Unit | Rating | ||||
Highly suitable S1 | Moderately suitable S2 | Marginally suitable S3 | Not suitable N | |||
Climatic regime | Mean temperature in growing season | ˚C | 20 - 25 | 26 - 28 18 - 19 | 29 - 34 14 - 17 | <14 >34 |
Land quality | Land characteristics | |||||
Moisture availability | Length of growing period | Days | >150 | 120 - 150 | 90 - 120 | <90 |
AWC | mm∙m−1 |
|
|
|
| |
Oxygen availability to roots | Soil drainage | Class | Well-drained to moderately well-drained | Imperfectly drained | Poorly drained | Very poorly drained; excessively drained |
Nutrient availability | Texture | Class | l, cl, sil, scl | sc, sic, c, ls, sicl, sl | C+ (45% - 60%) | C++ (>60%) |
pH | 1:2.5 | 6.5 - 7.5 | 7.6 - 8.5; 5.5 - 6.4 | 8.6 - 10; 4.5 - 5.4 | <4.5; >10 | |
OC | % | 0.6 - 0.7 | 0.5 - 0.6 | 0.3 - 0.5 | <0.3 | |
Rooting conditions | Effective soil depth | cm | 65 - 100 | 65 - 50 | 50 - 25 | <25 |
Stoniness | % | <15 | 15 - 35 | >35 |
| |
Soil toxicity | Salinity (EC saturation extract) | dS∙m−1 | <4.0 | 4.0 - 6.0 | >6.0 |
|
Sodicity (ESP) | % | <15 | 15 - 30 | 30 - 40 | >40 | |
Erosion hazard | Slope | % | <3 | 3 - <5 | 5 - 10 | >10 |