Which limitation constrained widespread pre-Columbian hillside terrace farming of maize in the Andes?

💡 Explanation

The limiting factor for maize production in Andean terraces was the low bioavailability of phosphorus because phosphorus is often bound in insoluble forms and not easily accessible to plants at high altitudes, impacting yields. Therefore, limited phosphorus is the correct constraint, rather than irrigation, nitrogen, or silicate issues that have lesser direct effects.

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