Subsistence production level c . Eventual land abandonment ( after 10-30 years ) 3 Outcomes of agriculture in land development . only at enormous cost . On the low - fertility podzolic soils that underly most of the tropical forests in ...

In Asia , farm settlements located close to forests may suffer higher incidences of malaria . ... Grazing rights , harvest of forest products , and shifting cultivation are episodic within a season , or even over periods of years or ...