Which constraint limited consistent maize yields in pre-Columbian chinampa agriculture despite nutrient-rich conditions?

💡 Explanation

When saline intrusion occurred near chinampa fields, osmotic stress occurs within the maize because higher salt concentrations outside the root draw water away, dehydrating the plant and inhibiting nutrient uptake. Therefore, variations in soil salinity limited yields, rather than anaerobic toxins, temperature shifts, or pollination which presented less persistent challenges in the environment.

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