Which problem arose preventing stable high-yield crop production in some chinampa systems around Tenochtitlan?

💡 Explanation

Decreased maize yields occurred when the supply of organic-rich bottom mud from the canals slowed as canals degraded; organic matter accretion through bacterial nitrogen fixation was the primary REPLENISHMENT MECHANISM. Therefore, crop health degraded, rather than a rise in predator effectiveness or crop disease.

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