Which environmental consequence followed the shift to intensive maize cultivation in the pre-Columbian Valley of Tehuacan?

💡 Explanation

When intensive maize cultivation started, nitrogen depletion occurred because maize's high nitrogen demand extracted it from the soil faster than natural replacement could replenish it. Therefore, depletion of soil nitrogen resulted, rather than changed sediment deposition, forest expansion, or regional rainfall, which depend on independent hydraulic or climate mechanisms.

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