Which outcome directly enabled dense maize cultivation in pre-Columbian chinampa systems?

💡 Explanation

When azolla is cultivated in chinampa canals, nitrogen fixation occurs because symbiotic cyanobacteria within azolla convert atmospheric nitrogen into ammonia, enriching the soil with readily available nitrogen fertilizer, directly supporting maize yields. Therefore nitrogen fixation results, rather than phosphate solubilization, potassium release, or carbon sequestration which provide indirect benefits or address different limiting nutrients.

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• Which outcome resulted when ancient Mesoamerican chinampa farmers over-cultivated maize without nitrogen replenishment?
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