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The fields are cleared and utilized for perhaps 2 years and left fallow for 2 years, long enough for the wild grasses to grow back.
The fields are used every year and rotated for a few months, with planting legumes and roots.
The field are cleared and utilized for up to 8 years and then left fallow for up to 10 years, long enough for small trees and bushes to grow back.
Esther Boserup
"Population growth influences the distribution of types of subsistence farming. It compels subsistence farmers to consider new farming approaches that produce enough food to take care of the additional people."
The fields are used several times a year and are never left fallow.
The fields are cleared and utilized for up to 2 years and left fallow for more than 20 years, long enough for the forest to grow back.