Which constraint limited maize cultivation expansion in pre-Columbian Andean terraced agriculture above 3500 meters?

💡 Explanation

When soil temperature drops below a threshold, the phosphorus solubilization by soil microorganisms decreases due to reduced metabolic activity which causes phosphorus to be less available because it remains bound in solid form, limiting maize growth. Therefore phosphorus lockout limits expansion, rather than nitrogen, radiation, or CO2 concentration which pose less significant biochemical constraints.

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