Which risk increases when pre-Columbian terrace farming in the Andes reduces soil organic matter during intensive maize cultivation?

💡 Explanation

When soil organic matter decreases from agricultural practices such as maize farming, soil structure degrades because the reduced binding of soil particles weakens aggregates, leading to reduced water infiltration. Therefore decreased infiltration efficiency results, rather than increased frost, beetle susceptibility or nutrient absorption effects better supported with high organic matter.

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