Which effect limited maize yield on Andean terraces without sophisticated plows?

💡 Explanation

Terraces relied on manual tilling, thus 'soil inversion' was weak, which limited nutrient cycling. This leads to reduced fertility because lack of nutrient return from lower to upper topsoil horizons, rather than temperature or predation changes.

• During Viking longship construction, which consequence results when hemp rope shrinks after weathering?
• Which degradation accelerates when tesserae of Byzantine mosaics experience differential hygrothermal expansion?
• Which consequence arose when the earlier mariner's astrolabe was replaced by the octant during 18th-century navigation?
• Which agricultural innovation allowed maize cultivation to expand into higher altitudes in the Andes?
• Which consequence resulted from timber bridge piling decomposition under Venice during the Renaissance?
• Which outcome arises when wrought iron chains supporting a historical suspension bridge experience prolonged fluctuating tensile forces?