Which resource limitation primarily constrained the expansion of pre-Columbian chinampa agriculture around Lake Texcoco?

💡 Explanation

When nutrient-rich mud depleted, augmenting chinampa fertility with decaying organic matter became crucial, because plant matter decomposition released essential nitrogen, phosphorus and potassium vital for sustained maize production. Therefore lack of adequate decaying plant matter quantities limited chinampa expansion, rather than rocks, sediment or water that were comparatively more available.

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