The answer is completely dependent on what crop is being farmed. For example, overfarming corn will deplete the soil of nitrogen, requiring farmers to spread nitrates. Soybeans, on the other hand, will add nitrogen to the soil, leading some corn farmers to grow soybeans because doing so is cheaper than spreading nitrates.
In nature, multiple species of plants usually inhabit the same area, creating an equilibrium as the waste product of one species supplies the needs of another, and so on.
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