Which outcome results from intensified maize cultivation in the ancient Three Sisters system without nutrient replenishment?

💡 Explanation

When maize cultivation intensifies without nutrient reintroduction, nitrogen depletion occurs because maize is a heavy nitrogen feeder and the traditional fallow period is shortened, decreasing natural soil regeneration. Therefore reduced harvests from nitrogen-deficient soil result, rather than increased disease, reduced pollination, or enhanced water retention which require different environmental contexts.

• Which mechanical process allowed Roman roads to maintain a relatively uniform grade across sloped terrain?
• Which outcome resulted from intensive maize cultivation on pre-Columbian terraced fields along steep Andean slopes?
• Which problem was exacerbated in early Mesopotamian copper metallurgy by sulfur impurities in the ore?
• Which mechanism maintains soil stability on Inca agricultural terraces during heavy rainfall events?
• Which structural weakness was primarily exploited by siege engines against medieval stone fortifications?
• Which outcome manifested when sections of the Roman Appian Way experienced differential settling on heterogeneous ground?