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Plants require a number of minerals in order to grow, and they get these minerals from the soil (through their roots). In a natural setting, the plants will sooner or later die or be eaten, and the mineral content of those plants will be returned to the soil in the form of either decaying vegetable matter, or animal droppings. However, human agriculture creates a different situation, in which plants are grown, and harvested, and the mineral content of those plants is taken away and never returned to the soil. Therefore, the soil gets exhausted, unless the farmer uses fertilizers to replace lost minerals.

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