Which limitation constrained the deployment of extensive terraced agriculture by pre-Columbian Andean civilizations at elevations above 4000m?

💡 Explanation

Deficient soil microbial activity at freezing temps constrained high altitude terrace farming because nutrient cycling slows dramatically, limiting soil fertility for sustained yields. Therefore freezing temperatures inhibited activity, rather than solar irradiance, erosion or CO2, which have less direct impact than temperature on soil microbiology limitation.

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