 After the second year the Bine farmers move on to an adjacent swidden and allow the previous swidden to lay fallow or unplanted for a period of 5 to 10 years in order to repopulate the vegetation (Eden 1993).The number of years that a swidden will lay fallow is determined by the plants demand for the nitrogen in the soil.Some plants will leach the soil of nitrogen in a few years and require four or five times that fallow; while other plants can be planted for many years and lay fallow only one or two times the planting period (Hyde 2010).