Which outcome occurred in some pre-Columbian chinampa systems during prolonged anaerobic soil conditions used for maize cultivation?

💡 Explanation

During prolonged anaerobic conditions in chinampa soils, microbial respiration shifts to use oxidized minerals like iron and phosphorus as electron acceptors, lowering phosphate solubility because reduction releases other ions that precipitate phosphate. Therefore, plant phosphate availability declines, rather than increased nitrogen fixation, iron sulfide formation, or enhanced silicon uptake that require aerobic or different geochemical conditions.

• Which consequence results from inaccuracies in Ptolemy's geocentric model when predicting planetary positions?
• Which consequence resulted from inaccuracies in dead reckoning during transoceanic voyages using 18th-century navigational methods?
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• Which structural consequence resulted when early suspension bridges experienced pedestrian-induced synchronous lateral excitation?
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