TABLE 9.1
Relationships between topsoil loss and yield loss
| Soil susceptibility ranking | Levels of inputs | Equation |
| Least susceptible | Low | Y = 1.0 X |
| Intermediate | Y = 0.6 X | |
| High | Y = 0.2 X | |
| Intermediate susceptible | Low | Y = 2.0 X |
| Intermediate | Y = 1.2 X | |
| High | Y = 0.4 X | |
| Most susceptible | Low | Y = 7.0 X |
| Intermediate | Y = 5.0 X | |
| High | Y = 3.0 X | |
Y = productivity loss in percent;
X = soil loss in cm.
| Most susceptible | Intermediate susceptible | Least susceptible |
| Acrisols, except Humic Acrisols | Arenosols | Chernozems |
| Ferralic Cambisols | Cambisols, except Ferralic Cambisols | Fluvisols |
| Ferralsols, except humic Ferralsols | Gleysols | Histosols |
| Ironstone soils | Greyzems | Humic Andosols |
| Lithosols | Humic Acrisols | Mollic Andosols |
| Planosols | Humic Ferralsols | Vertisols |
| Rendzinas | Kastanozems | |
| Solonchaks | Luvisols | |
| Solonetz | Nitisols | |
| Phaeozems | ||
| Regosols | ||
| Vitric Andosols | ||
| Xerosols | ||
| Yermosols |
| LGP (days) | Thermal zone | ||||||||
| T1 | T2 | T3 | T4 | T5 | T6 | T7 | T8 | T9 | |
| < 75 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.25 | 0.25 | 0.25 | 0.25 |
| 75–179 | 1.0 | 1.0 | 1.0 | 0.5 | 0.5 | 0.25 | 0.25 | 0.25 | 0.25 |
| 180–269 | 1.5 | 1.5 | 1.5 | 0.75 | 0.75 | 0.5 | 0.5 | 0.5 | 0.5 |
| > 270 | 2.0 | 2.0 | 2.0 | 1.0 | 1.0 | 0.5 | 0.5 | 0.5 | 0.5 |
