Critical land is unproductive land. Although manageable, low land productivity is very critical. In fact, there can be an acceptable amount of production is much less than the cost of management. Lahanini is barren, bare, can not be used for agriculture, because of very low fertility rate.
Factors that lead to degraded land, are as follows:
- Drought, usually occurs in areas of rain shadow.
- Stagnant water constantly, such as in coastal areas that are always covered with swamps.
- Soil erosion and masswasting which usually occurs in upland areas, mountains, and sloping areas. Masswasting is the movement of soil down the slope.
- Processing of land less attention to those aspects of environmental sustainability. Critical land may occur in the highlands, mountains, sloping areas, or even in the lowlands.
- The inclusion of material that can last a long time kelahan agriculture (can not be broken down by bacteria) such as plastic. Plastic can withstand ± 200 years in the soil so it is very disturbing kelestaian soil fertility.
- Freezing of water, usually the polar regions or high mountains. Pollution, contaminants such as pesticides and industrial waste that goes into good agricultural land through streams or other cause of agricultural land through streams or other cause farmland to be critical.
