One problem experienced by farmers is the tired land that may be caused by biotic and abiotic factors. This type of phenomenon limits the growth of plants and cause death. This is due to the low activity of the roots that may arise ill. This problem is not easy to solve and the best way would be to leave the ground at rest, but because costs are too high we are trying to study methods more simple and cheap. One of these is the use of fumigants that allow soil disinfestation. Remains an important factor to understand what the problem that caused the fatigue of the land, because as I said the reasons could be many and there are few scientific medoti to understand the origin of the phenomenon.