Which biogeochemical consequence resulted from widespread terraced maize cultivation in the Andes by pre-Columbian civilizations?

💡 Explanation

With terraced maize cultivation, increased moisture and limited oxygen in waterlogged soils promote microbial denitrification because microbes use nitrate as an oxygen substitute, leading to the conversion of nitrate into atmospheric nitrogen. Therefore, reduced atmospheric nitrogen results, rather than other consequences which require differing biogeochemical processes.

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