FAO's Global Agro-Ecological Zones 2000 database calculates the areas of land ecologically suitable for cultivating each of 27 different crops for each country around the world.
For details, see Section 3.A of Nunn and Qian (2008) "Columbus’s Contribution to World Population and Urbanization: A Natural Experiment Examining the Introduction of Potatoes", who use the data on potato to estimate the effect of potato cultivation on population growth.
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