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 |