Which outcome reduces long-term chinampa field fertility when cultivating continuous maize crops?

💡 Explanation

When cultivating continuous maize, micronutrient depletion in the soil occurs because maize has high nutrient requirements pulling trace elements from the modified mud beds. Therefore, micronutrient deficiencies develop rather than alkalization, liquefaction, or nitrogen excess which rely on altered water chemistry/plant composition respectively.

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• Which optical effect occurring in medieval astrolabes limits accuracy during twilight observations?
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