Is coming from many sources, the type of soil it may be different. Cause there may be contaminants that are present in the soil, for example pesticides. Chemical fertilizers or other chemicals. If there is excessive amounts may permeate to the underground, and if it is raining may flow into the soil, the rivers. Such as this should be brought into use before the clay season or make a khandin and covered with plastic sheets to prevent flows into nearby.
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