Explanation of column headings
Thermal zones;
| MC 1 | Warm tropics | |
| MC 2 | Moderately cool tropics | |
| MC 3 | Cool tropics | |
| MC 7 | Warm sub-tropics (summer rainfall) | |
| MC 8 | Moderately cool sub-tropics (summer rainfall) | |
| MC 9 | Cool sub-tropics (summer rainfall) |
Soil constraints (as defined by the FAO):
| Slopes>30% | Steeply dissected to mountainous terrain with dominant slopes of more than 30%. | |
| Shallow soils | Mostly Lithosols and other soils with a restriction for deep root penetration or mechanised tillage. Subject to erosion when on steep slopes. | |
| Poor drainage | Mostly gleysols and other soils with water during part of the year or prone to waterlogging. Require drainage for most crops, except rice. | |
| Vertic properties | High content of clay with shrinking and swelling properties. Tillage difficult when topsoils too dry or too moist. |
Population density: based on estimated populations for about 1975.
Potential population density: FAO (1982) computed population supporting capacities at three levels of inputs - low (present), or unimproved land use), intermediate, and high (full use of improved productivity and conservation practices). The intermediate estimate is given here, as a guide to the scope for increased density.
Available agricultural land: the total area, minus an allowance for nonagricultural use, usually a function of the size of the population.
Cropland: rainfed plus irrigated cropland.
Rangeland: grazing areas (not including unused land).
na: not available.
* Area figures differ in the FAO sources.
LGP sub-zones
| M 1 | 150-179 growing days | |
| M 2 | 120-149 growing days | |
| D 1 | 90-119 growing days | |
| D 2 | 75-89 growing days. |
