Which long-term constraint faced chinampa agriculture concerning continuous maize cultivation?

💡 Explanation

In chinampas, intensive maize cultivation without adequate nutrient replenishment caused depletion of essential elements like nitrogen and phosphorus, reducing long-term soil fertility because of nutrient uptake by the crop. Therefore declining soil fertility posed aconstraint, rather than increased pests, rising water tables, or decreased sunlight, which depend on factors beyond soil nutrient depletion.

• Which systematic error appears in historical astrolabe altitude measurements taken nearing the horizon?
• Which outcome resulted from the deliberate flooding of chinampas during the dry season?
• Which outcome occurs when a Roman aqueduct siphon's discharge elevation is significantly higher than its intake elevation?
• Which structural consequence was mitigated most effectively by layering different materials in ancient ziggurat construction?
• Which failure arises when ancient bronze-smiths repeatedly cold work weapon edges without annealing?
• Which challenge complicated Roman roads constructed over unstable marshland terrain?